Substituent chemical shifts of the organotin moiety in compounds of the type RSnMe n Cl 3 − n ( n = 0 to 3; R = n ‐alkyl)

The 13 C and 119 Sn NMR spectra of 33 organotin compounds of the type RSnMe n Cl 3 − n and related types are discussed. The substituent effects of the groups SnMe 3 , SnMe 2 Cl, SnMeCl 2 and SnCl 3 (and of some related groups) on the carbon chemical shifts in the alkyl group R have been determined; the SnMe 3 group causes a small upfield shift of the carbon attached to it, while the other groups cause downfield shifts. The shifts show a monotonic change on replacing methyl groups in Me 3 Sn by chlorine atoms. The effects on carbons further removed from the tin atom are discussed. Variation in R causes little change in n J (SnC) or δ( 119 Sn).