Synthesis and characterization of cage and bicyclic silsesquioxanes via dehydration of silanols

被引：0
|
作者：
Unno, M [1 ]
Alias, SB [1 ]
Arai, M [1 ]
Takada, K [1 ]
Tanaka, R [1 ]
Matsumoto, H [1 ]
机构：
[1] Gunma Univ, Fac Engn, Dept Appl Chem, Gunma 3768515, Japan
来源：
APPLIED ORGANOMETALLIC CHEMISTRY | 1999年 / 13卷 / 04期
关键词：
silsesquioxane; ladder polysiloxane; cage polysiloxane; X-ray structure; silanol;
D O I：
暂无
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Synthesis of cage and ladder silsesquioxanes by the dehydration of silanols using dicyclohexylcarbodiimide (DCC) is described. The reaction of 1,3-dicyclohexyldisiloxane-1,1,3,3-tetraol with DCC gave octa(cyclohexylsilsesquioxane) in 13% yield. The bicyclic ladder siloxane 3 (Ph(8)Thex(2)Si(6)O(7)) was prepared from 1,1,3,3-tetraphenyldisiloxane-1,3-diol and 1,3-dithexyldisiloxane-1,1,3,3-tetraol (Thex or thexyl denotes 1,1,2-trimethylpropy) at 80 degrees C, In this reaction, the propellane-type cage siloxane 2 (Ph(6)Thex(2)Si(5)O(6)) was generated also. Upon reaction completion at 120 degrees C, only 2 was obtained, The reaction from the same starting compounds with diisopropylcarbodiimide at 80 degrees C resulted in another caged siloxane, Ph(4)Thex(4)Si(6)O(8) (5) The structures of 2, 3 and 5 were determined by X-ray crystallography, Copyright (C) 1999 John Wiley & Sons, Ltd.
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页码：303 / 310
页数：8
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