Propargyl-, Allenyl- und Alkinyl-Phosphane; Synthese, Reaktivität, Isomerisierung

The synthesis and reactivity of non-coordinated and coordinated propargyl phosphanes are discussed. The isomerization of the propargyl unit in (R)P(Cl)(CH 2 C≡CH) (R=2,4,6- t Bu 3 C 6 H 2 O) in the presence of NEt 3 yields the allenyl substituted product (R)P(Cl)(CH=C=CH 2 ). However, in the presence of HNEt 2 the dimethylenecyclobutane 7 is formed.