Results Four different diazo lithium salts 1, 4, 5, and 6 have been prepared by addition of a stoichiometric amount of BuLi to a cold (-80,-100" C) THF solution of the corresponding monosubstituted diazomethane (Scheme 11). Since 1 was a demonstrated nitrilimine precursor,'we first studied its reactivity with non-phosphorus derivatives in order to explore the influence of the electrophile on the course of the reaction and/or on the stability of the ...