Results Materials. PNPDPP (2) was prepared from p-nitrophenol and diphenyl ch10rophosphate. l~ Substrate 6 required prior reaction of 2, 4-dinitrophenol with diethyl chlorophosphate to give diethyl 2, 4-dinitrophenyl phosphate, which was then cleaved to 6 with LiBr/acetone. 14J5 CTABr was a purified commercial sample, and dihexadecyldimethylammonium bromide (16,) was a gift from Professor T. Kunitake. ...