Propargylphosphonium salts

Thermal reaction of affenyf azines derived from propargylphosphonium salts with ketenes, isocyanates. CS2 or phthallc anhydride to form bi and Incyclic fused pyrazolo heterocycles... 

In the same way, the propargylphosphonium salt (21) can be rearranged to allenylphos-phonium salt (22)278,279 (reaction 36). 

R3PCH=CHCH=CH2 Clin the same way, in the case of the propargylphosphonium salt, two successive isomerizations of the unsaturation from the / ,y to the opposition, combined with a Michael-type addition of nucleophiles on the intermediate allenyl phosphonium, afford various /Mieterosubstituted oc,/ -unsaturated phosphonium salts, which have found interesting applications in organic synthesis (reaction 44). 

Wittig reaction of propargylphosphonium salts with aldehydes is (Z)-selective using MesGa as base. From the analogous suUbnium salts, alkynyl epoxides are obtained (base f-BusGa). ... 

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