5-Chlor-5-phenyl-1-oxa-4.6-dithia-5-stannocan, ein diplanarer Übergangszustand bei der Racemisierung der Wanne-Sessel- Konformation in einem 8-Ring [1] / 5-Chloro-5-phenyl-1-oxa-4,6-dithia-5-stannocane, a Diplanar Transition State for the Racemisation of the Boat-Chair Conformation in an Eight-Membered Ring [1]

Abstract

The title compound has been synthesized from PhSnCl₃ and the disodium salt of bis(2-mercaptoethyl)ether. The crystal structure has been determined and refined to R - 0.033. The conformation of the eight-membered heterocycle is slightly disordered and represents a diplanar form, which is generally considered the transition state near the saddle point of the energy surface between the two enantiomers of the boat-chair con-formation. The configuration around tin is a trigonal bipyramid with equatorial sulfur atoms, an equatorial phenyl group and with axial atoms Cl and O (transannular distance Sn···O 241 pm).