Synthesis of Novel Carbosilane Dendrimers Based on Pentaerythritol  

作　　者：唐新德 张其震 范星河 周其凤 

机构地区：[1]School of Chemistry and Chemical Engineering, Shandong University Jinan, Shandong 250100, China [2]Institute of New Materials, Shandong Jiaotong University, Jinan, Shandong 250023, China [3]College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

出　　处：《Chinese Journal of Chemistry》2004年第11期1366-1371,共6页中国化学（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Nos. 29874020,59573029).

摘　　要：Novel pentaerythritol-based carbosilane dendrimers centered at carbon have been synthesised. Starting from tetraallyl ether based upon pentaerythritol as the core molecule, a succession of alternate Pt-catalyzed hydrosilyla-tion of allyl groups with HSiCl3 and allylations of SiCl groups thus introduced with CH2=CHCH2MgBr in THF provided a divergent synthesis of three generations of carbosilane dendrimers in which the Si atoms are linked by CH2CH2CH2 groups. The reaction conditions for hydrosilylation must be well controlled. After purification by chromatography on silica gel pure products for each generation were obtained. The IR, 1H and 13C NMR spectra and elemental analysis data are consistent with the proposed structures. The molecular weights of the resulting car-bosilne dendrimers have been determined by vapor pressure osmometry.Novel pentaerythritol-based carbosilane dendrimers centered at carbon have been synthesised. Starting from tetraallyl ether based upon pentaerythritol as the core molecule, a succession of alternate Pt-catalyzed hydrosilyla-tion of allyl groups with HSiCl3 and allylations of SiCl groups thus introduced with CH2=CHCH2MgBr in THF provided a divergent synthesis of three generations of carbosilane dendrimers in which the Si atoms are linked by CH2CH2CH2 groups. The reaction conditions for hydrosilylation must be well controlled. After purification by chromatography on silica gel pure products for each generation were obtained. The IR, 1H and 13C NMR spectra and elemental analysis data are consistent with the proposed structures. The molecular weights of the resulting car-bosilne dendrimers have been determined by vapor pressure osmometry.

关 键 词：PENTAERYTHRITOL carbosilane dendrimer HYDROSILYLATION ALLYLATION 

分 类 号：O621[理学—有机化学]