PREPARATION AND NMR STUDY OF PHOSPHORUS-FLUORINE COMPOUNDS UNDERGOING INTRAMOLECULAR EXCHANGE. PART 1.¹BENZYLMETHYLAMINOFLUORO-PHOSPHORANES

Abstract

Abstract The preparation is described of a series of benzylmethylamino-substituted fluorophosphoranes of general formula PhCH2(Me)NPF4–n R n (where R = Me, Ph; n = 0, 1, 2) from the cleavage of the silicon-nitrogen bond in benzylmethylamino-trimethylsilane by fluorophosphoranes. The structures of the new compounds are deduced from 1H, 19F and 31P nmr data. Variable temperature spectra give information about intramolecular exchange processes, and a detailed study was made of benzylmethylamino-diphenyldifluorophosphorane and of the corresponding 2-methyl-piperidyl compound.