Interactions of hexachlorodiphosphazenium ion with an alcohol and with some silicon—oxygen reagents and their role in the catalysis of polycondensation in silanol—alkoxysilane systems
作者:Julian Chojnowski、Marek Cypryk、Witold Fortuniak、Krzysztof Kaźmierski、Richard G Taylor
DOI:10.1016/s0022-328x(96)06582-5
日期:1996.12
well as fast consecutive hydrolysis and ethanolysis strongly contribute to the overall process. Results of kinetic studies point to inhibition of these component reactions by an excess of MOEt. Interactions of the hexachloro-1λ-diphosphaza-1-enium salts with MOEt, ethanol and silanol were studied by 31P NMR. It was demonstrated that a fast substitution reaction of chloride by ethoxy group takes place
研究了三甲基乙氧基硅烷(MOEt)和五甲基二硅氧烷醇在六氯-1λ-二磷杂-1-烯鎓盐的催化下在正庚烷中的缩合反应。尽管底物转化率与时间的依赖关系表明异官能团缩合作用占主导地位,但该过程更为复杂。均相缩合以及快速连续的水解和乙醇分解作用对整个过程有重要贡献。动力学研究的结果表明过量的MOEt抑制了这些组分反应。通过31研究了六氯-1λ-二磷杂氮杂-1-en盐与MOEt,乙醇和硅烷醇的相互作用1 H NMR。已经证明,当将乙醇或乙氧基硅烷引入六氯二磷氮杂鎓盐的溶液中时,发生氯被乙氧基的快速取代反应。该过程导致催化剂的缩合活性降低。