CONFORMATIONS OF SATURATED SIX-MEMBERED-RING PHOSPHOROUS HETEROCYCLES. CHAIR-CHAIR EQUILIBRIA FOR CYCLOPHOSPHAMIDE, THE 5,5-DIMETHYL DERIVATIVE, AND RELATED 1,3,2-OXAZAPHOSPHORINANES. RELATIVE CONFORMATIONAL ENERGIES OF NITROGEN MUSTARD AND OTHER R2<

Article abstract of DOI:10.1021/ja00293a044

A series of 5,5-dimethyl-3-R-2-oxo-2-Z-1,3,2-oxazaphosphorinanes (1, R= H, Z= Me2N; 2, R= H, Z= Et2N; 3, R= H, Z= i-Pr2N; 4, R= H, Z= N(CH2CH2Cl)2; 5, R= Ph,Z= Me2N) has been prepared, and their conformations have been studied by 1H NMR at 300 MHz.The pos