Abstract
A series of allyltin compounds, R 3- n Cl n SnCH 2CH=CH 2 (R = Me, n-Bu; n = 0-2) and Ph 3SnCH 2CH=CH 2, have been studied by gas-phase UV photoelectron spectroscopy, in order to determine the extent, if any, of σ-π conjugation (hyper-conjugation) between the σ(SnCH 2) bond and the π(CC) orbital of the allyl group. Analysis of the spectra, supported by a fragment analysis based on LCBO (Linear Combination of Bond Orbitals) calculations, indicated that the hyperconjugation operates for all the members of the series, the extent decreasing on passing from R = Me to R = n-Bu and, within each series, with increasing n.
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