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ChemInform Abstract: Reactions of a Cyclotrisilane with Styrene Derivatives and Diarylacetylenes - Evidence for Nucleophilic Silylenes

Authors :
Uwe Dehnert
Johannes Belzner
Heiko Ihmels
Source :
ChemInform. 32
Publication Year :
2001
Publisher :
Wiley, 2001.

Abstract

Silaindanes were obtained by reaction of hexakis[2-(dimethylaminomethyl)phenyl]cyclotrisilane (3) with 3 equiv. of various styrenes. Analogous treatment of 3 with p-methoxystryrene yielded a mixture of the corresponding silaindane and a 2:1 adduct between bis[2-(dimethylaminomethyl)phenyl]silylene (4) and the styrene. Competition experiments show that the addition rate of 4 to the triple bond of diarylacetylenes is accelerated by electron-withdrawing substituents. The reaction constant (Ļ=+0.85±0.21) indicates that 4 acts as a nucleophile in these reactions. The rate determining step in these reactions of cyclotrisilane 3 is the formation of silylene 4. The rate constant for this first order process was determined to be (6.3±0.4)×10āˆ’4 sāˆ’1 at 60°C.

Details

ISSN :
15222667 and 09317597
Volume :
32
Database :
OpenAIRE
Journal :
ChemInform
Accession number :
edsair.doi...........8cb033e5985ce8b423b7727b1908607e
Full Text :
https://doi.org/10.1002/chin.200119145