Steric structure of phosphorus-containing heterocycles Communication 36. 2-dialkylamino-1,3,2-dioxaphosphepines with tetracoordinated phosphorus

Conclusions In conformity with the data of¹H NMR, DM, and the Kerr effect for 2-dialkylamino-2-oxo(thiono, seleno)-1,3,2-dioxaphosphepines, a conformational equilibrium of two forms of twist and chair with an equatorial dialkylamino group is observed in solutions. The equilibrium is displaced in favor of the latter.Then the products were crystallized after removing a part of the solvent in vacuo.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 799–803, April, 1985.