Conformations of saturated six-membered ring phosphorus heterocycles. Axial, nonplanar dimethylamino group of 5,5-dimethyl-2-(dimethylamino)-2-oxo-1,3,2-oxazaphosphorinane as determined by x-ray crystallography. 1H NMR and IR spectroscopic analysis of con - Holmes, Robert R.; Day, Roberta O.; Setzer, William N. (Journal of the American Chemical Society, 1984)