An efficient synthesis of 2-benzylimidazo[1,2-a]pyrimidines in water is accomplished via Pd/C-cat... more An efficient synthesis of 2-benzylimidazo[1,2-a]pyrimidines in water is accomplished via Pd/C-catalyzed reaction of 2-imino-1-(2-propynyl)pyrimidine with various aryl iodides in the presence of K 2 CO 3 as the base.
Journal of The Chinese Chemical Society, Mar 13, 2012
In this work, we propose a quantitative structure-activity relationship (QSAR) approach in order ... more In this work, we propose a quantitative structure-activity relationship (QSAR) approach in order to model the anti-protozoal activities of 24 derivatives of 1-methylbenzimidazole against trichomoniasisvaginalis. A QSAR model was built using the Bayesian regularized artificial neural network (BR-ANN). A total of 7 molecular descriptors, as the most feasible ones, were selected to build the QSAR model. Some of the selected descriptors seem to relate to the presence of ester group and chlorine atoms at the inner atmosphere of the compounds to increase the anti-protozoal activity. The robustness and predictability of the proposed model were verified by the test data set and leave-one-out cross-validation methods. The mean square errors (MSEs) and mean relative errors (MREs) for the test data set are 0.0049 and 0.82%, respectively, and for the leave-one-out method, they are 0.0031 and 0.75%, respectively. Finally, it was proved that the QSAR model is a useful tool in prediction of the anti-protozoal activities of 1-methylbenzimidazole compounds, and that it could be used to guide the synthesis of new 1-methylbenzimidazole derivatives with better activities.
4-(4-Nitrophenyl)urazole(4) was reacted with two equivalents of hexamethylene diisocyanate (HMDI)... more 4-(4-Nitrophenyl)urazole(4) was reacted with two equivalents of hexamethylene diisocyanate (HMDI)(5), isophorone diisocyanate (IPDI)(6) and tolylene-2,4-diisocyanate (TDI)(7), in DMF as a solvent to forming the related diisocyanates. The reaction of 4-(4-aminophenyl)urazole(1) with phthalic anhydride(2) in a mixture of pyridine and acetic acid (2:3) as a solvent led to the related amic acid. The amic acid was heated in the same solvent mixture to give 4-(4-phthalimidophenyl)-1,2,4-triazolidine-3,5- dione(3). Solution polyconden-sation reactions of the new diisocyanates, with 4-(4-phthalimidophenyl)-1,2,4-triazolidine-3,5-dione(3)were performed in DMF in the presence of pyridine as a catalyst and lead to the formation of novel aliphatic and aromatic co-polyureas(8, 9, 10). These novel co-polyureas have inherent viscosities in a range of 0.11-0.23 dLg-1 inDMF at 25oC. Some structural characterization and physical properties of these novel co-polymers are reported.
A combination of molybdatophosphoric acid and NaNO 2 in the presence of wet SiO 2 is used as an e... more A combination of molybdatophosphoric acid and NaNO 2 in the presence of wet SiO 2 is used as an effective oxidizing agent for the oxidation of urazoles and bis-urazoles to their corresponding triazolinediones under mild and heterogeneous conditions with moderate to excellent yields.
The reaction of 4-(4-aminophenyl)urazole (1) with tetrabromophthalic anhy-dride (2) in a mixture ... more The reaction of 4-(4-aminophenyl)urazole (1) with tetrabromophthalic anhy-dride (2) in a mixture of pyridine and acetic acid (3:2) as a solvent led to the related amic acid. The amic acid was heated in the same solvent mixture to give 4-(4-tetrabromo-phthalimidophenyl)-1,2,4-triazolidine-3,5-dione (3). Solution polycondensation reactions of monomer (3) with hexamethylene diisocyanate (HMDI) and isophorone diisocyanate (IPDI) were performed in DMF in the presence of pyridine as a catalyst; and lead to the formation of novel aliphatic polyureas. The polymerization reaction with tolylene-2,4-diisocyanate (TDI) gave novel aromatic polyurea. These novel polyureas have inherent viscosities in a range of 0.17-0.25 dLg -1 in DMF at 25 o C. Some structural characterization and physical properties of these novel polymers are reported. 2012 Trade Science Inc. -INDIA Polyurea; 4-(4-tetrabromophthalimidophenyl)-1,2,4-triazolidine-3,5-dione.; Step-growth polymerization; Urazole.
4-(4-Nitrophenyl)urazole(4) was reacted with two equivalents of hexamethylene diisocyanate (HMDI)... more 4-(4-Nitrophenyl)urazole(4) was reacted with two equivalents of hexamethylene diisocyanate (HMDI)(5), isophorone diisocyanate (IPDI)(6) and tolylene-2,4-diisocyanate (TDI)(7), in DMF as a solvent to forming the related diisocyanates. The reaction of 4-(4-aminophenyl)urazole(1) with phthalic anhydride(2) in a mixture of pyridine and acetic acid (2:3) as a solvent led to the related amic acid. The amic acid was heated in the same solvent mixture to give 4-(4-phthalimidophenyl)-1,2,4-triazolidine-3,5- dione(3). Solution polyconden-sation reactions of the new diisocyanates, with 4-(4-phthalimidophenyl)-1,2,4-triazolidine-3,5-dione(3)were performed in DMF in the presence of pyridine as a catalyst and lead to the formation of novel aliphatic and aromatic co-polyureas(8, 9, 10). These novel co-polyureas have inherent viscosities in a range of 0.11-0.23 dLg-1 inDMF at 25oC. Some structural characterization and physical properties of these novel co-polymers are reported.
A combination of molybdatophosphoric acid and NaNO 2 in the presence of wet SiO 2 is used as an e... more A combination of molybdatophosphoric acid and NaNO 2 in the presence of wet SiO 2 is used as an effective oxidizing agent for the oxidation of urazoles and bis-urazoles to their corresponding triazolinediones under mild and heterogeneous conditions with moderate to excellent yields.
In this work, the random phase approximation theory is applied to generate an expression for the ... more In this work, the random phase approximation theory is applied to generate an expression for the direct correlation function based on the linear isotherm regularity equation of state. We use the hard-core Yukawa potential in the modelling of real fluids, in which the molecular parameters are state-dependent. We use this model to predict the behaviour of the structure factor S(k) in a wide range of states for the argon, krypton and xenon liquids. Finally, we compare our results with the experimental and theoretical data available in the literature. Our calculations are capable of showing the behaviour of S(k) at a wide range of k values with good accuracy, as compared to the experimental data for simple fluids at near and far from their triple points. The Ornstein-Zernike behaviour of S(k) observed at the supercritical region was in satisfactory agreement with experiment.
In this work, a new method based on the modified Enskog theory (MET) is presented for calculation... more In this work, a new method based on the modified Enskog theory (MET) is presented for calculation of transport properties at high densities (ρ > ρ c). The main limitation of using the MET is lack of experimental data for co-volume, b 0. We have substituted b 0 from hard sphere (HS) theory and zero density transport properties from the kinetic theory of gases for HS in the MET expression, because of the fact that dense fluids behave more and less like a HS fluid. As a result, a simple linear expression for the self diffusion (D) and quadratic expressions for viscosity (η) and thermal conductivity (λ) coefficients have been obtained in terms of Y at high densities (ρ > ρ c), where Y = (T (∂p/∂T))/ρRT − 1. To evaluate the obtained expressions, we have used experimental values of densities and the transport properties and calculated Y from the reported accurate equation of state (EOS) for argon and xenon. We have noticed that the quadratic fits for viscosity and thermal conductivity and the linear fit (when T < T c) for self diffusion hold quiet well with the correlation coefficient, R 2 ≥ 0.9994, when ρ > ρ c. Also, we have found that the curves for different isotherms of a fluid fall onto a common curve at high densities over entire temperature range for which experimental data exist, but the curves depend on the nature of fluid. So, by using experimental data of transport properties for one isotherm and an accurate EOS for calculation of Y for a dense fluid, we may calculate the corresponding property of that fluid for any other isotherm. In this work, we have used this approach to predict the viscosity coefficient of n-alkanes from propane to n-octane and cyclohexane at different densities (ρ > ρ c) and temperatures. To do such predictions, we need an accurate EOS for each compound which is not generally available. For this reason, we have made use of the modified linear isotherm regularity (MLIR). Therefore, using the calculated values of density and thermal pressure coefficient from the MLIR and the coefficients of the viscosity expression for each of these fluids, their viscosities have been predicted with the average percentage error less than 1.6%. To make the approach more general, we have used the principle of corresponding states to present viscosity expression independent of fluid in terms of the reduced variables. Therefore, one may use experimental data for one isotherm of an arbitrary fluid to find the coefficients of the reduced viscosity expression. Then, these coefficients may be used for other fluids at the same reduced temperature, T r , to calculate the reduced viscosity. Here, we have selected n-butane as a reference compound because of abundance of experimental data. We have used the coefficients of the expression for n-butane and density and Y have been calculated from the MLIR, this approach gives viscosity of hydrocarbons with the average percentage error less than 1.7%. Similar approach has been used to calculate the self diffusion coefficient and thermal conductivity of dense fluids.
Phosphorus, Sulfur, and Silicon and the Related Elements, 2011
... a &amp; Vahid Keley a pages 464-470. ... Bakherad, M., Isfahani, HN, Keivanloo, A. and Sa... more ... a &amp; Vahid Keley a pages 464-470. ... Bakherad, M., Isfahani, HN, Keivanloo, A. and Sang, G. 2008. Tetrahedron Lett. , 49: 61886191. View all references , 13 13. Kamali, TA, Bakherad, M., Nasrollahzadeh, M., Farhangi, S. and Habibi, D. 2009. Tetrahedron Lett. , 50: 54595462. ...
In this work, the modified linear isotherm regularity (LIR) equation of state parameter table is ... more In this work, the modified linear isotherm regularity (LIR) equation of state parameter table is extended in order to represent volumetric behaviour of primary alkylamines. In addition, the isothermal compressibility and thermal expansion coefficient of these compounds have been predicted. To do so, we consider each of primary alkylamine as a hypothetical mixture of methyl, methylene and a primary amine functional group, in which the interaction potential of each pair is assumed to be the average effective pair potential. Then, the LIR equation of state has been extended to such a hypothetical mixture. Furthermore, three basic compounds, namely, propane,n-butane, and cyclohexane are used to obtain the contribution of methyl and methylene groups in the EOS parameters, and also other appropriate compounds are used to obtain the contribution of the primary amine functional groups, such as 1-pentylamine for the contribution of −CH2NH2and 2-aminopentane for the contribution of〉CHNH2group...
Phosphorus, Sulfur, and Silicon and the Related Elements, 2011
... a &amp; Vahid Keley a pages 464-470. ... Bakherad, M., Isfahani, HN, Keivanloo, A. and Sa... more ... a &amp; Vahid Keley a pages 464-470. ... Bakherad, M., Isfahani, HN, Keivanloo, A. and Sang, G. 2008. Tetrahedron Lett. , 49: 61886191. View all references , 13 13. Kamali, TA, Bakherad, M., Nasrollahzadeh, M., Farhangi, S. and Habibi, D. 2009. Tetrahedron Lett. , 50: 54595462. ...
... Hassan Sabzyan a , Corresponding Author Contact Information , E-mail The Corresponding Author... more ... Hassan Sabzyan a , Corresponding Author Contact Information , E-mail The Corresponding Author and Zahra Kalantar b. ... In (NPF 2 ) 4 , in spite of its planar structure, there exist two sets of PNbonds with different bond lengths located alternately along each other in the ...
The reaction of 4-(4-aminophenyl)urazole (1) with tetrabromophthalic anhy-dride (2) in a mixture ... more The reaction of 4-(4-aminophenyl)urazole (1) with tetrabromophthalic anhy-dride (2) in a mixture of pyridine and acetic acid (3:2) as a solvent led to the related amic acid. The amic acid was heated in the same solvent mixture to give 4-(4-tetrabromo-phthalimidophenyl)-1,2,4-triazolidine-3,5-dione (3). Solution polycondensation reactions of monomer (3) with hexamethylene diisocyanate (HMDI) and isophorone diisocyanate (IPDI) were performed in DMF in the presence of pyridine as a catalyst; and lead to the formation of novel aliphatic polyureas. The polymerization reaction with tolylene-2,4-diisocyanate (TDI) gave novel aromatic polyurea. These novel polyureas have inherent viscosities in a range of 0.17-0.25 dLg -1 in DMF at 25 o C. Some structural characterization and physical properties of these novel polymers are reported. 2012 Trade Science Inc. -INDIA Polyurea; 4-(4-tetrabromophthalimidophenyl)-1,2,4-triazolidine-3,5-dione.; Step-growth polymerization; Urazole.
An efficient synthesis of 2-benzylimidazo[1,2-a]pyrimidines in water is accomplished via Pd/C-cat... more An efficient synthesis of 2-benzylimidazo[1,2-a]pyrimidines in water is accomplished via Pd/C-catalyzed reaction of 2-imino-1-(2-propynyl)pyrimidine with various aryl iodides in the presence of K 2 CO 3 as the base.
Journal of The Chinese Chemical Society, Mar 13, 2012
In this work, we propose a quantitative structure-activity relationship (QSAR) approach in order ... more In this work, we propose a quantitative structure-activity relationship (QSAR) approach in order to model the anti-protozoal activities of 24 derivatives of 1-methylbenzimidazole against trichomoniasisvaginalis. A QSAR model was built using the Bayesian regularized artificial neural network (BR-ANN). A total of 7 molecular descriptors, as the most feasible ones, were selected to build the QSAR model. Some of the selected descriptors seem to relate to the presence of ester group and chlorine atoms at the inner atmosphere of the compounds to increase the anti-protozoal activity. The robustness and predictability of the proposed model were verified by the test data set and leave-one-out cross-validation methods. The mean square errors (MSEs) and mean relative errors (MREs) for the test data set are 0.0049 and 0.82%, respectively, and for the leave-one-out method, they are 0.0031 and 0.75%, respectively. Finally, it was proved that the QSAR model is a useful tool in prediction of the anti-protozoal activities of 1-methylbenzimidazole compounds, and that it could be used to guide the synthesis of new 1-methylbenzimidazole derivatives with better activities.
4-(4-Nitrophenyl)urazole(4) was reacted with two equivalents of hexamethylene diisocyanate (HMDI)... more 4-(4-Nitrophenyl)urazole(4) was reacted with two equivalents of hexamethylene diisocyanate (HMDI)(5), isophorone diisocyanate (IPDI)(6) and tolylene-2,4-diisocyanate (TDI)(7), in DMF as a solvent to forming the related diisocyanates. The reaction of 4-(4-aminophenyl)urazole(1) with phthalic anhydride(2) in a mixture of pyridine and acetic acid (2:3) as a solvent led to the related amic acid. The amic acid was heated in the same solvent mixture to give 4-(4-phthalimidophenyl)-1,2,4-triazolidine-3,5- dione(3). Solution polyconden-sation reactions of the new diisocyanates, with 4-(4-phthalimidophenyl)-1,2,4-triazolidine-3,5-dione(3)were performed in DMF in the presence of pyridine as a catalyst and lead to the formation of novel aliphatic and aromatic co-polyureas(8, 9, 10). These novel co-polyureas have inherent viscosities in a range of 0.11-0.23 dLg-1 inDMF at 25oC. Some structural characterization and physical properties of these novel co-polymers are reported.
A combination of molybdatophosphoric acid and NaNO 2 in the presence of wet SiO 2 is used as an e... more A combination of molybdatophosphoric acid and NaNO 2 in the presence of wet SiO 2 is used as an effective oxidizing agent for the oxidation of urazoles and bis-urazoles to their corresponding triazolinediones under mild and heterogeneous conditions with moderate to excellent yields.
The reaction of 4-(4-aminophenyl)urazole (1) with tetrabromophthalic anhy-dride (2) in a mixture ... more The reaction of 4-(4-aminophenyl)urazole (1) with tetrabromophthalic anhy-dride (2) in a mixture of pyridine and acetic acid (3:2) as a solvent led to the related amic acid. The amic acid was heated in the same solvent mixture to give 4-(4-tetrabromo-phthalimidophenyl)-1,2,4-triazolidine-3,5-dione (3). Solution polycondensation reactions of monomer (3) with hexamethylene diisocyanate (HMDI) and isophorone diisocyanate (IPDI) were performed in DMF in the presence of pyridine as a catalyst; and lead to the formation of novel aliphatic polyureas. The polymerization reaction with tolylene-2,4-diisocyanate (TDI) gave novel aromatic polyurea. These novel polyureas have inherent viscosities in a range of 0.17-0.25 dLg -1 in DMF at 25 o C. Some structural characterization and physical properties of these novel polymers are reported. 2012 Trade Science Inc. -INDIA Polyurea; 4-(4-tetrabromophthalimidophenyl)-1,2,4-triazolidine-3,5-dione.; Step-growth polymerization; Urazole.
4-(4-Nitrophenyl)urazole(4) was reacted with two equivalents of hexamethylene diisocyanate (HMDI)... more 4-(4-Nitrophenyl)urazole(4) was reacted with two equivalents of hexamethylene diisocyanate (HMDI)(5), isophorone diisocyanate (IPDI)(6) and tolylene-2,4-diisocyanate (TDI)(7), in DMF as a solvent to forming the related diisocyanates. The reaction of 4-(4-aminophenyl)urazole(1) with phthalic anhydride(2) in a mixture of pyridine and acetic acid (2:3) as a solvent led to the related amic acid. The amic acid was heated in the same solvent mixture to give 4-(4-phthalimidophenyl)-1,2,4-triazolidine-3,5- dione(3). Solution polyconden-sation reactions of the new diisocyanates, with 4-(4-phthalimidophenyl)-1,2,4-triazolidine-3,5-dione(3)were performed in DMF in the presence of pyridine as a catalyst and lead to the formation of novel aliphatic and aromatic co-polyureas(8, 9, 10). These novel co-polyureas have inherent viscosities in a range of 0.11-0.23 dLg-1 inDMF at 25oC. Some structural characterization and physical properties of these novel co-polymers are reported.
A combination of molybdatophosphoric acid and NaNO 2 in the presence of wet SiO 2 is used as an e... more A combination of molybdatophosphoric acid and NaNO 2 in the presence of wet SiO 2 is used as an effective oxidizing agent for the oxidation of urazoles and bis-urazoles to their corresponding triazolinediones under mild and heterogeneous conditions with moderate to excellent yields.
In this work, the random phase approximation theory is applied to generate an expression for the ... more In this work, the random phase approximation theory is applied to generate an expression for the direct correlation function based on the linear isotherm regularity equation of state. We use the hard-core Yukawa potential in the modelling of real fluids, in which the molecular parameters are state-dependent. We use this model to predict the behaviour of the structure factor S(k) in a wide range of states for the argon, krypton and xenon liquids. Finally, we compare our results with the experimental and theoretical data available in the literature. Our calculations are capable of showing the behaviour of S(k) at a wide range of k values with good accuracy, as compared to the experimental data for simple fluids at near and far from their triple points. The Ornstein-Zernike behaviour of S(k) observed at the supercritical region was in satisfactory agreement with experiment.
In this work, a new method based on the modified Enskog theory (MET) is presented for calculation... more In this work, a new method based on the modified Enskog theory (MET) is presented for calculation of transport properties at high densities (ρ > ρ c). The main limitation of using the MET is lack of experimental data for co-volume, b 0. We have substituted b 0 from hard sphere (HS) theory and zero density transport properties from the kinetic theory of gases for HS in the MET expression, because of the fact that dense fluids behave more and less like a HS fluid. As a result, a simple linear expression for the self diffusion (D) and quadratic expressions for viscosity (η) and thermal conductivity (λ) coefficients have been obtained in terms of Y at high densities (ρ > ρ c), where Y = (T (∂p/∂T))/ρRT − 1. To evaluate the obtained expressions, we have used experimental values of densities and the transport properties and calculated Y from the reported accurate equation of state (EOS) for argon and xenon. We have noticed that the quadratic fits for viscosity and thermal conductivity and the linear fit (when T < T c) for self diffusion hold quiet well with the correlation coefficient, R 2 ≥ 0.9994, when ρ > ρ c. Also, we have found that the curves for different isotherms of a fluid fall onto a common curve at high densities over entire temperature range for which experimental data exist, but the curves depend on the nature of fluid. So, by using experimental data of transport properties for one isotherm and an accurate EOS for calculation of Y for a dense fluid, we may calculate the corresponding property of that fluid for any other isotherm. In this work, we have used this approach to predict the viscosity coefficient of n-alkanes from propane to n-octane and cyclohexane at different densities (ρ > ρ c) and temperatures. To do such predictions, we need an accurate EOS for each compound which is not generally available. For this reason, we have made use of the modified linear isotherm regularity (MLIR). Therefore, using the calculated values of density and thermal pressure coefficient from the MLIR and the coefficients of the viscosity expression for each of these fluids, their viscosities have been predicted with the average percentage error less than 1.6%. To make the approach more general, we have used the principle of corresponding states to present viscosity expression independent of fluid in terms of the reduced variables. Therefore, one may use experimental data for one isotherm of an arbitrary fluid to find the coefficients of the reduced viscosity expression. Then, these coefficients may be used for other fluids at the same reduced temperature, T r , to calculate the reduced viscosity. Here, we have selected n-butane as a reference compound because of abundance of experimental data. We have used the coefficients of the expression for n-butane and density and Y have been calculated from the MLIR, this approach gives viscosity of hydrocarbons with the average percentage error less than 1.7%. Similar approach has been used to calculate the self diffusion coefficient and thermal conductivity of dense fluids.
Phosphorus, Sulfur, and Silicon and the Related Elements, 2011
... a &amp; Vahid Keley a pages 464-470. ... Bakherad, M., Isfahani, HN, Keivanloo, A. and Sa... more ... a &amp; Vahid Keley a pages 464-470. ... Bakherad, M., Isfahani, HN, Keivanloo, A. and Sang, G. 2008. Tetrahedron Lett. , 49: 61886191. View all references , 13 13. Kamali, TA, Bakherad, M., Nasrollahzadeh, M., Farhangi, S. and Habibi, D. 2009. Tetrahedron Lett. , 50: 54595462. ...
In this work, the modified linear isotherm regularity (LIR) equation of state parameter table is ... more In this work, the modified linear isotherm regularity (LIR) equation of state parameter table is extended in order to represent volumetric behaviour of primary alkylamines. In addition, the isothermal compressibility and thermal expansion coefficient of these compounds have been predicted. To do so, we consider each of primary alkylamine as a hypothetical mixture of methyl, methylene and a primary amine functional group, in which the interaction potential of each pair is assumed to be the average effective pair potential. Then, the LIR equation of state has been extended to such a hypothetical mixture. Furthermore, three basic compounds, namely, propane,n-butane, and cyclohexane are used to obtain the contribution of methyl and methylene groups in the EOS parameters, and also other appropriate compounds are used to obtain the contribution of the primary amine functional groups, such as 1-pentylamine for the contribution of −CH2NH2and 2-aminopentane for the contribution of〉CHNH2group...
Phosphorus, Sulfur, and Silicon and the Related Elements, 2011
... a &amp; Vahid Keley a pages 464-470. ... Bakherad, M., Isfahani, HN, Keivanloo, A. and Sa... more ... a &amp; Vahid Keley a pages 464-470. ... Bakherad, M., Isfahani, HN, Keivanloo, A. and Sang, G. 2008. Tetrahedron Lett. , 49: 61886191. View all references , 13 13. Kamali, TA, Bakherad, M., Nasrollahzadeh, M., Farhangi, S. and Habibi, D. 2009. Tetrahedron Lett. , 50: 54595462. ...
... Hassan Sabzyan a , Corresponding Author Contact Information , E-mail The Corresponding Author... more ... Hassan Sabzyan a , Corresponding Author Contact Information , E-mail The Corresponding Author and Zahra Kalantar b. ... In (NPF 2 ) 4 , in spite of its planar structure, there exist two sets of PNbonds with different bond lengths located alternately along each other in the ...
The reaction of 4-(4-aminophenyl)urazole (1) with tetrabromophthalic anhy-dride (2) in a mixture ... more The reaction of 4-(4-aminophenyl)urazole (1) with tetrabromophthalic anhy-dride (2) in a mixture of pyridine and acetic acid (3:2) as a solvent led to the related amic acid. The amic acid was heated in the same solvent mixture to give 4-(4-tetrabromo-phthalimidophenyl)-1,2,4-triazolidine-3,5-dione (3). Solution polycondensation reactions of monomer (3) with hexamethylene diisocyanate (HMDI) and isophorone diisocyanate (IPDI) were performed in DMF in the presence of pyridine as a catalyst; and lead to the formation of novel aliphatic polyureas. The polymerization reaction with tolylene-2,4-diisocyanate (TDI) gave novel aromatic polyurea. These novel polyureas have inherent viscosities in a range of 0.17-0.25 dLg -1 in DMF at 25 o C. Some structural characterization and physical properties of these novel polymers are reported. 2012 Trade Science Inc. -INDIA Polyurea; 4-(4-tetrabromophthalimidophenyl)-1,2,4-triazolidine-3,5-dione.; Step-growth polymerization; Urazole.
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