Non-planar axial Me2N in -2-dimethylamino-2-thio-5--butyl-1,3,2-oxazaphosphorinane

Abstract An X-ray crystallographic study of the title compound shows it to have an axial Me 2 N with pyramidal N and a lengthened N-P bond. Conversely, the endocyclic NH-P bond is shortened. The origins of these effects are assigned to specific geometrical relationships of the Me 2 N/P=S and NH/P=S groupings imposed by the ring system.