The cyclic stannylene RSnR (2; RR ) C(SiMe 3 ) 2 SiMe 2 CH 2 CH 2 Me 2 Si(Me 3 Si) 2 C) reacted with alkyl iodides R′I (R′ ) Et, i Pr) to give the Sn IV compounds RSnR′IR (6b,c), which were converted by treatment with silver trifluoroacetate into RSnR′(OCOCF 3 )R (7b,c). Reactions of the stannylene 2 with appropriate enones or diones yielded the products RRSnOC(Et)d CHCH 2 (10), RRSnOCPhdCPhO (11), RRSnOC 6 H 2 -3,5-t Bu 2 O (12), and RRSnOC 14 H 8 O (13) (OC 14 H 8 O ) 9,10-phenanthrenediolato). The crystal structures of 6b, 7b,c, and 10-13 have been determined. Treatment of 2 with water, alcohols, or phenol led to ring opening. There is evidence from ESR spectroscopy that the oxidative additions of diones involve radical intermediates. The compound RSnMeIR (6a) reacted with ICl to give the chloride RSnMeClR (15), but, in contrast to the previously described crowded trialkyltin halides (Me 3 Si) 3 CSnMe 2 X (X ) Cl, I), neither 6a nor 15 reacted with nucleophilic reagents.

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