A Versatile Route To Cyclic (Alkyl)(Amino)Carbene‐Stabilized Stibinidenes

Abstract

Abstract A convenient route for the synthesis of the cAAC Me (cAAC=cyclic (alkyl)(amino)carbene, cAAC Me =1‐(2,6‐di‐ iso ‐propylphenyl)‐3,3,5,5‐tetramethyl‐pyrrolidin‐2‐ylidene) and cAAC Cy (cAAC Cy =2‐azaspiro[4.5]dec‐2‐(2,6‐diisopropylphenyl)‐3,3‐dimethyl‐1‐ylidene) stabilized stibinidenes cAAC Me ⋅SbMes ( 2 a ) (Mes=2,4,6‐trimethylphenyl) and cAAC Cy ⋅SbMes ( 2 b ) is reported. A mechanism for the formation of [cAAC R Cl][SbCl 3 Mes] 1 and cAAC R ⋅SbMes 2 from the reaction of cAAC with the antimony(III) precursor SbCl 2 Mes, which proceeds via the isolable intermediate [cAAC R SbClMes][SbCl 3 Mes] ( 3 ), is proposed.