Abstract
A comparative study of the integrated extinction coefficients (A) of the C≡C stretching bands in the IR spectra of acetylene derivatives Me3SiC≡CR, HC≡CR, and Me3CC≡CR was carried out. The resonance interactions of substituents with a triple bond are the main cause of the changes in the values ofA. The total resonance effect of the Me3Si fragment involves both acceptor (d, π-conjugation) and donor (σ, π-conjugation) components; d, π-conjugation dominates in the silylacetylenes studied. TheσR0 resonance constant of the Me3Si substituent in compounds Me3SiC≡CR is 0.17±0.02.
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