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Abstract
Proton NMR data for the Group III methyl derivatives, MMe 3 and LiMMe 4 are compared with NMR data for the novel tin—Group III-metal bonded species, Li[Me 3SnMMe 3] (M Al, Ga, In and Tl) and for Li[(Me 3Sn) n -TlMe 4− n ] ( n = 0 to 4), reported here for the first time. The presence of tinmetal bonding in these derivatives is established by the observed tin-across-metal coupling constants and for the thallium derivatives by the additional observation of thallium-across-tin coupling. The variation in the magnitudes of 2 J(SnCH), 2 J(TlCH), 3 J(SnMCH) and 3 J(TlSnCH) are reported as a function of M and as a function of the number of Me 3Sn groups bond to thallium in the [(Me 3Sn) n TIME 4− n ] −anions. Proposals concerning the factors governing the changes in these coupling constants and the chemical shifts are presented.
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