STABLE DITHIOXOPHOSPHORANE, DISELENOXOPHOSPHORANE, AND SELENOXOPHOSPHINE BEARING 2,4-DI-T-BUTYL-6-(DIMETHYLAMINO)PHENYL GROUP AS A NEW STERICALLY PROTECTING AUXILIARY

2,4-Di-t-butyl-6-(dimethylamino)phenylphosphonous dichloride was prepared from 2-bromo-3,5-di-t-butyl-N,N-dimethylaniline. The dichloride was then converted to the corresponding diphosphene. The reaction of the diphosphene with sulfur or selenium in triethylamine afforded 2,4-di-t-butyl-6-(dimethylamino)-phenyldithioxophosphorane or diselenoxophosphorane, respectively, as a very stable compound and the diselenoxophosphorane was deselenated with hexamethylphosphorous triamide to give selenoxophosphine.