Abstract

The derivatization of aminophosphine ligands intotheir corresponding ammonium or ammonium-phosphoniumsalts with protic acids is reported. The resulting salts are, ingeneral, much more tolerant of ambient conditions andrepresent convenient alternatives to the often highly air-sensitiveunprotected ligands. The salts have been used to preparetransition metal complexes identical to those obtained fromunprotected ligands by simple, in situ neutralization with base.These materials have also been found to be convenientsynthons, affording a convenient alternate route to usefultransition-metal catalysts when used in the absence of base.