CRYSTAL-STRUCTURES OF THE 1 1 ADDUCTS OF DIPHENYLCYCLOPROPENONE WITH 3-TRIPHENYLSTANNYLOXY-4,5-DIMETHYLISOTHIAZOLE 1,1-DIOXIDE AND 3-TRIPHENYLSTANNYLOXYBENZISOTHIAZOLE 1,1-DIOXIDE/

Triphenyltin hydroxide condenses with 4,5-dimethylisothiazol-3(2H)-one 1,1-dioxide in the. presence of one equivalent of diphenylcyclopropen one in ethanol to give (C6H5)3SnOC=NS(O2)C(CH3)=CCH3 . O=CC(C6H5)CC6H5 . In the adduct the cyclic ketone (C=O = 1.245(3) angstrom) is linked coordinately (Sn <-- O = 2.372(2) angstrom; Sn <-- O=C = 122.7(2)-degr ees-C) to the Lewis acid (Sn-O = 2.164(2) angstrom). The geometry of t he tin atom is trans-trigonal bipyramidal (O-Sn <-- O = 178.5(1)-degre es; SIGMAC-Sn-C = 357.7(3)). Triphenyltin hydroxide reacts with saccha rin and diphenylcyclopropenone in ethanol to give the isostructural (C 6H5)3SnOC=NS(O2)C6H4 . O=CC(C6H5)-CC6H5 complex. Selected bond distanc es and angles in this complex are: Sn <-- O = 2.164(3), Sn <-- O = 2.4 21(3), C=O = 1.230 (4) angstrom, Sn <-- O=C = 129.3(2)-degrees; O-SN < -- O = 173.2(1)-degrees; SIGMAC-Sn-C = 358.5(3)-degrees.