Synthesis and spectral characterization of medium ring distannacycloalkanes and their Lewis acid derivatives

Article abstract of DOI:10.1016/0022-328X(92)83182-H

A study of the syntheses and some properties of several methyl substituted acyclic and cyclic bidentate organotin Lewis acids has been carried out.Of particular interest were cyclic species with 7-, 8-, 9- and 10-membered rings.The distannalkanes and distannacycloalkanes were converted to the chlorides by chlorodemethylation with tin chlorides or mercuric chloride; this reaction was accompanied by ring cleavage in some cases.Chlorides, in turn, were readily converted to the methanesulfonates and trifluoromethanesulfonates. 1H, 13C and 119Sn NMR and IR spectral data were used to gain information concerning structures, conformations and aggregation behavior.The mesylates are associated in chloroform; the triflates are not.