Synthesis and flame retardant testing of new boronated and phosphonated aromatic compounds
作者:Vladimir Benin、Sravanthi Durganala、Alexander B. Morgan
DOI:10.1039/c1jm14682c
日期:——
The present report describes the preparation and use of some dimethyl terephthalate derivatives in transition metal-catalyzed coupling reactions to produce new reactive flame retardants. Dimethyl iodoterephthalate and dimethyl 2,5-diiodoterephthalate were successfully employed in the preparation of phosphonic and boronic esters and acids. The latter were tested for heat release with a microcombustion calorimeter (ASTM D7309) to determine the potential for heat release reduction of these flame retardant molecules. The results showed that the addition of boronic or phosphonic acids greatly lowered the heat release, due to a condensed phase (char formation) mechanism. Adding ester groups to the boronic acids or phosphonic acids could either completely remove all flame retardant effects or make the molecule act more like a vapor phase flame retardant. Finally, the various potential flame retardants were solvent blended with a thermoplastic polyurethane to assess their flammability reduction effects by microcombustion calorimetry. The results of these experiments found that the molecules that reduced heat release the most by themselves showed the greatest reduction in heat release in a polyurethane as well, with the boronic acids yielding the greatest reduction in heat release.
Structure, Theoretical Studies, and Coupling Reactions of Some New Cyclic Boronic Esters
作者:Andrew Kuttler、Sravanthi Durganala、Albert Fratini、Alexander B. Morgan、Vladimir Benin
DOI:10.1002/hc.21102
日期:2013.9
some new pinacolboronate esters, and it also outlines the use of the target structures in Suzuki coupling reactions to produce newaromatic or heteroaromatic esters and amides. X-ray structural analysis of the studied compounds revealed that the pinacolborane ring's position with respect to the benzene ring varies, depending on the particular environment. An ortho-positioned carboxylic ester (methyl
本报告描述了一些新的频哪醇硼酸酯的 X 射线结构和理论研究,并概述了在 Suzuki 偶联反应中使用目标结构来生产新的芳族或杂芳族酯和酰胺。所研究化合物的 X 射线结构分析表明,频哪醇硼烷环相对于苯环的位置因特定环境而异。邻位羧酸酯(甲酯)导致频哪醇硼烷单元相对于苯环几乎垂直取向,而邻位酰胺(N,N-二甲基酰胺)导致频哪醇硼烷单元几乎共面取向。基于空间和电子因素,已经提供了合理的解释。