FLUOROPHOSPHAALKENES F3CP=C(F)NR2, HP=C(F)NR2 AND AMINOPHOSPHAALKYNESP-EQUIVALENT-TO-C-NR2 - SYNTHESIS, STRUCTURE AND REACTIVITY

Electron-poor fluorophosphaalkenes of the type F3CP=C (F) NR2 (1) and HP=C (F) NR2 (2) can be prepared in g-amounts by reacting HP(CF3)2 or H2PCF3 with secondary amines HNR2. Due to their electronic structure ( n/pi-interaction) they show surprising differences to other PC (p-p)pi -systems and to olefines. Similarly the phosphaalkyne P=C-NiPr2 (3) ob tained from H2PCF3 and HNiPr2, and the related labile compounds P=C-NR 2 (R=Me, Et) generated in situ from HP=C(F)NR2, exhibit chemical prope rties different from the known alkylphosphaalkynes.