Preparation, crystal structure and thermal decomposition study of some trimethylsilyl esters of dicarbamic acids
作者:R. Szalay、Zs. Böcskei、D. Knausz、Cs. Lovász、K. Újszászy、L. Szakács、P. Sohár
DOI:10.1016/0022-328x(95)05833-b
日期:1996.3
trimethylsilylated dicarbamic acid esters 1–9 and 10 were prepared. Their thermal decomposition was studied in n-alkanes as media. The reactions were monitored by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS), respectively. Some N-silylated cyclic ureas 11–15 were also prepared from the corresponding esters 2–6 by thermolysis. The crystal structures of 2, 5 and 8 are also discussed
制备了一些新的三甲基甲硅烷基化的二氨基甲酸酯1-9和10。在正构烷烃中研究了它们的热分解。通过气相色谱(GC)和气相色谱-质谱(GC-MS)分别监测反应。还通过热解由相应的酯2-6制备了一些N甲硅烷基化的环状脲11-15。还讨论了2、5和8的晶体结构。2和5的晶体和分子结构具有非常相似的特征。这两个分子均通过其分子对称中心位于结晶学反演中心上。氨基甲酸酯基在所有三种情况下都是平面的,与预期的一样。数据分析表明,由于SiO的共轭将Si原子限制在氨基甲酸酯基团平面内的力与晶体堆积力相当,在较小的平面外运动中也不是不利的。