Reactions of tin(IV) halides with (n=1 or 2)

Article abstract of DOI:10.1016/0022-328X(87)87161-9

The reactions of (I) and (II) with thin(IV) Lewis acids E=SnX4 or RSnX3 (X=Cl, Br, or I; R=alkyl, Ph, Fe(η-C5H5)(CO)2 or Fe(η-C5H5)(CO)(CNMe) proceed by way of often isolable adducts and .II but not I also forms adducts with <2SnX2>.On the basis of IR spectroscopy it is concluded that these adducts have the > structure with N->Sn bonds (L=CO or CNMe).They are more or less unstable; some break down in the solid state, some in the benzene solution, and all in acetone solution to give mono-iron complexes, in reactions which appear to be largely if not completely regiospecific.Thus when E=SnX4 the products are and where L=CO (from I) or CNMe (from II) which appear to form in ca. equal amounts and in high yields.Small amounts of ^{+ -} and are also formed from I when X=Br or I, but the second do not appear to be primary products.A previously proposed mechanistic scheme is used to account for the course of these reactions.