p-Coordination of a diorganotin dication.
Reaction of tetraalkynylstannanes Sn(C.tplbond.CR)4 (R = Me, Et, Pr, CHMe2, Bu) with BEt3 gave complex I. I (R = Me) was characterized by x-ray crystallog. I (R = Me) reacted with L (pyridine or dipyridine) to give complex II. I was also converted to spirostannyl complex III in toluene soln.
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