INTENSITY OF BANDS OF THE C-C STRETCHING MODES IN THE IR-SPECTRA AND CONJUGATION IN SILYLACETYLENES

Authors
EGOROCHKIN AN SKOBELEVA SE MUSHTINA TG BOGORADOVSKY ET
Citation
An. Egorochkin et al., INTENSITY OF BANDS OF THE C-C STRETCHING MODES IN THE IR-SPECTRA AND CONJUGATION IN SILYLACETYLENES, Russian chemical bulletin, 46(1), 1997, pp. 71-75
Citations number
28
Categorie Soggetti
Chemistry
Journal title
Russian chemical bulletin → ACNP
ISSN journal
10665285
Volume
46
Issue
1
Year of publication
1997
Pages
71 - 75
Database
ISI
SICI code
1066-5285(1997)46:1<71:IOBOTC>2.0.ZU;2-4
Abstract
A comparative study of the integrated extinction coefficients (A) of t he C=C stretching bands in the LR spectra of acetylene derivatives Me3 SiC=CR, HC=CR. and Me3CC=CR was carried out. The resonance interaction s of substituents with a triple bond are the main cause of the changes in the values of A. The total resonance effect of the Me3Si fragment involves both acceptor (d,pi-conjugation) and donor (sigma,pi-conjugat ion) components; d,pi-conjugation dominates in the silylacetylenes stu died. The sigma(R)(0) resonance constant of the Me3Si substituent in c ompounds Me3SiC=CR is 0.17+/-0.02.