Reaktive EC(p‐p)π‐Systeme, XXVI. Einfache Synthese für Methylenphosphane (Phosphaalkene) des Typs HPC(F)NR 2 und das Phosphaalkin PC‐N(iPr) 2

Reactive EC(p‐p)π‐Systems, XXVI. — Facile Synthesis of Phosphaalkenes of the Type HPC(F)NR 2 and the Phosphaalkyne PC‐N(iPr) 2 The reaction of trifluoromethylphosphane CF 3 PH 2 with secondary amines in a 1:3 molar ratio leads to the novel methylenephosphanes (phosphaalkenes) HP C(F)NR 2 [R Me ( 1 ), Et ( 2 ), Pr ( 3 ), piperidine ( 4 )] in yields between 40 and 60%. The analogous deuterium compound DP C(F)NEt 2 ( 5 ) is formed by the reaction of CF 3 PD 2 with Et 2 ND. However, with di(isopropyl)amine the new phosphaalkyne P CN(iPr) 2 ( 6 ) is produced instead of the expected phosphaalkene.