3-Aryl-2,3-dihydro-1,3,2-benzothiazaphosph(V)oles. A new class of phosphoranes

Abstract

Aryl 2-nitrophenyl sulphides react with tervalent phosphorus reagents to give the novel oxythiaza-phosphoranes (2; X = S) which easily isomerise to the phosphoramidates (3), expect in the case of the more stable bicyclic analogues, e.g., 3-(2,6-dimethylphenyl)-2,2-ethylenedioxy-2-phenyl-2,3-dihydro- 1,3,2-benzothiazaphosp(V)ole(5; Y = H), which by X-ray crystallography, is much disorted towards a square pyramid.