Fourier transform nuclear magnetic resonance investigations of organotin compounds. Part 6. Tin-119 and carbon-13 nuclear magnetic resonance. Spectra of hexaorganoditins and octaorganotritins
- 1 January 1977
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 14,p. 1842-1847
- https://doi.org/10.1039/p29770001842
Abstract
In a series of closely related hexa-alkylditins or octaorganotritins, the magnitude of 1J(Sn–Sn) varies greatlyaccording to the nature of the alkyl groups; in the ditin series a linear relationship is found between 1J(Sn–Sn) and the sum of the Taft σ* constants of the alkyl groups. Application of this relation to the tri-tins allows estimation of σ* values for the trialkyltin groups: similar values for σ* are obtained by considering the values of 1J(Sn–C) in dior tri-tins. σ* Values for Me3Si and Me3Ge have also been obtained. Replacementof alkyl groups in a hexa-alkylditin by electronegative acetoxy groups causes a large increase in 1J(Sn–Sn); replacement of alkyl groups by phenyl groups causes only small variations. The 119Sn and 13C chemical shifts and long-range coupling constants are discussed. The larger hexa-alkylditins and octa-alkyltritins exhibit relatively large negative nuclear Overhauser effects, which may be partially eliminated by adding chromium tris(acetylacetenate) to the solution under investigation.Keywords
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