NHC‐stabilized Parent Arsanylalanes and ‐gallanes
Michael A. K. Weinhart, Michael Seidl, Alexey Y. Timoshkin, Manfred Scheer
Abstract
Abstract The synthesis and characterization of the unprecedented compounds IDipp⋅E′H 2 AsH 2 (E′=Al, Ga; IDipp=1,3‐bis(2,6‐diisopropylphenyl)imidazolin‐2‐ylidene) are reported, the first monomeric, parent representatives of an arsanylalane and arsanylgallane, respectively, stabilized only by a LB (LB=Lewis Base). They are prepared by a salt metathesis reaction of KAsH 2 with IDipp⋅E′H 2 Cl (E′=Al, Ga). The H 2 ‐elimination pathway through the reaction of AsH 3 with IDipp⋅E′H 3 (E′=Al, Ga) was found to be a possible synthetic route with some disadvantages compared to the salt metathesis reaction. The corresponding organo‐substituted compounds IDipp⋅GaH 2 AsPh 2 ( 1 ) and IDipp⋅AlH 2 AsPh 2 ( 2 ) were obtained by the reaction of KAsPh 2 with IDipp⋅E′H 2 Cl (E′=Al, Ga). The novel branched parent compounds IDipp⋅E′H(EH 2 ) 2 (E′=Al, Ga; E=P, As) were synthesized by salt metathesis reactions starting from IDipp⋅E′HCl 2 (E′=Al, Ga). Supporting DFT computations give insight into the different synthetic pathways and the stability of the products.