Abstract
The reaction of 1-methyl-3-(2-propenyl)imidazolium bromide ( 1) or 1,3-bis(2-propenyl)-imidazolium bromide ( 2) with [Ir(μ-OMe)(cod)] 2 afforded the five coordinated iridium(I) carbene complexes [IrBr(L)(cod)] ( 3) (L=1-methyl-3-(2-propenyl)imidazolin-2-ylidene) and ( 4) (L=1,3-bis(2-propenyl)imidazolin-2-ylidene). The reaction proceeds via an in situ deprotonation of the imidazolium salt. Molecular structure determinations on 3 and 4 confirmed the coordination of the carbene ligands via the carbene carbon atom and one allyl group in both complexes. Treatment of complex 3 with an excess of AgBF 4 gave the dinuclear bromo bridged complex [(Ir(μ-Br)(L)(cod)] 2BF 4 ( 5) (L=1-methyl-3-(2-propenyl)imidazolin-2-ylidene). The reaction of complex 4 with an excess of AgBF 4 led to the mononuclear complex [Ir(L)(cod)]BF 4 ( 6) (L=1,3-bis(2-propenyl)imidazolin-2-ylidene) where both N-allyl substituents are coordinated to the iridium(I) center.
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