排序方式: 共有1条查询结果,搜索用时 0 毫秒
1
1.
Nina Armbruster Bettina Jaschke Uwe Kingebiel Claudia Voit Fabio dall' Antonia Regine Herbst‐Irmer 《无机化学与普通化学杂志》2008,634(11):1937-1942
The lithium salts of the Me3Si‐ as well as Me3Si‐ and Me2SiF‐substituted Cyclotrisilazanes I and II react with tert‐butylacylchloride under ring contraction and formation of the cyclodisilazane‐silylester, Me3SiN(SiMe2–N)2SiMe2–O–CO–CMe3 ( 1 ). The lithium salt of the fluorodi‐methylsilyl‐substituted cyclotrisilazan III forms with benzoylchloride primarily in the analogous reaction the carboxy‐silyl‐amide, Me2SiF(N–SiMe2)2SiMe2–NH–CO–C6H5+ ( 2 ), which can be converted with III and benzoylchloride into the cyclodisilazane‐silylester, Me2SiF(NSiMe2)2SiMe2–O–CO–C6H5, ( 3 ). A silylester substituted six‐membered disila‐oxadiazine ( 4 ) is the result of the reaction of the lithiated cyclotrisilazane, (Me2SiNH)2, (Me2SiNLi) with tert‐butyl‐acylchloride. The reaction includes anionic ring contraction and can be rationilized by a process analogous to keto‐enol‐tautomerism. Dilithiated octamethyl‐cyclotetrasilazane, (Me2SiNHMe2SiNLi)2, reacts with tert‐butyl‐acylchloride or benzoylchloride in a molar ratio 1:2 to yield symmetrically acylestersubstituted cyclodisilazanes, (RCO–O–SiMe2–NSiMe2)2, R = C6H5 ( 5 ), CMe3 ( 6 ). The reaction mechanisms are discussed and the crystal structures of 2 and 6 are reported. 相似文献
1