分子内力
硅氧烷
化学
冷凝
单体
水解
高分子化学
缩合反应
有机化学
催化作用
聚合物
热力学
物理
作者
Tomohide Sugiyama,Hiroya Shiba,Michio Yoshikawa,Hiroaki Wada,Atsushi Shimojima,Kazuyuki Kuroda
标识
DOI:10.1002/chem.201805942
摘要
The controlled synthesis of oligosiloxanes with well-defined structures is important for the bottom-up design of siloxane-based nanomaterials. This work reports the synthesis of various polycyclic and cage siloxanes by the hydrolysis and intramolecular condensation of monocyclic tetra- and hexasiloxanes functionalized with various alkoxysilyl groups. An investigation of monoalkoxysilylated cyclosiloxanes revealed that intramolecular condensation occurred preferentially between adjacent alkoxysilyl groups to form new tetrasiloxane rings. The study of dialkoxy- and trialkoxysilylated cyclotetrasiloxanes revealed multistep intramolecular condensation reactions to form cubic octasiloxanes in relatively high yields. Unlike conventional methods starting from organosilane monomers, intramolecular condensation enables the introduction of different organic substituents in controlled arrangements. So-called Janus cubes have been successfully obtained, that is, Ph4 R4 Si8 O12 , in which R=Me, OSiMe3 , and OSiMe2 Vi (Vi=vinyl). These findings will enable the creation of siloxane-based materials with diverse functions.
科研通智能强力驱动
Strongly Powered by AbleSci AI