REACTIVITY OF A PHOSPHANYLCARBENE (LAMBDA(5)-PHOSPHAACETYLENE) WITH LEWIS-ACIDS - X-RAY CRYSTAL-STRUCTURES OF THE FIRST CARBENE-GALLANE COMPLEX AND C-GALLYL-SUBSTITUTED PHOSPHORUS YLIDE

A remarkably diverse reactivity toward Lewis acids is exhibited by the phosphanylcarbene (R2N)2PC̈SiMe3 (R  c‐C6H11). The methylated Lewis acids MMe3 (M  Al, Ga, In) undergo 1,2 addition reactions to form the C‐substituted phosphorylides 1 (X  Me), while the corresponding chlorides MCl3 form the first stable phosphanylcarbene–Lewis acid complexes 2 (X  Cl). (Figure Presented.) Copyright © 1994 by VCH Verlagsgesellschaft mbH, Germany