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Synthesis of novel carbosilane dendrimers based on pentaerythritol
Author(s) -
Tang XinDe,
Zhang QiZhen,
Fan XingHe,
Zhou QiFeng
Publication year - 2004
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20040221130
Subject(s) - hydrosilylation , chemistry , dendrimer , pentaerythritol , silyl ether , silylation , tetraethyl orthosilicate , polymer chemistry , ether , dimethylsilane , organic chemistry , vapor pressure osmometry , molecule , chlorosilane , catalysis , silicon , vapor pressure , fire retardant
Novel pentaerythritol‐based carbosilane dendrimers centered at carbon have been synthesised. Starting from tetraallyl ether based upon pentaerythrtol as the core molecule, a succession of alternate Pt‐catalyzed hydrosilylation of allyl groups with HSiC1 3 and allylations of Sicl groups thus introduced with CH 2 =CHCH 2 MgBr in THF provided a divergent synthesis of three generations of carbosilane dendrimers in which the Si atoms are linked by CH 2 CH 2 CH 2 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, 1 H and 13 C NMR spectra and elemental analysis data are consistent with the proposed structures. The molecular weights of the resulting carbosilne dendrimers have been determined by vapor pressure osmometry.