Publisher： John Wiley & Sons Inc
E-ISSN： 1521-3757|127|30|8875-8879
ISSN： 0044-8249
Source： ANGEWANDTE CHEMIE, Vol.127, Iss.30, 2015-07, pp. : 8875-8879
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Abstract
AbstractThe stable cationic iridacyclopentenylidene [TpMe2Ir(CHC(Me)C(Me)CH2(NCMe)]PF6 (A; TpMe2=hydrotris(3,5‐dimethylpyrazolyl)borate) has been obtained by α‐hydride abstraction from the iridacyclopent‐2‐ene [TpMe2Ir(CH2C(Me)C(Me)CH2)(NCMe)]. Complex A exhibits Brønsted–Lowry acidity at the IrCH2 and proximal (relative to IrCH2) methyl sites. The coordination of an extra molecule of acetonitrile to the iridium center initiates the reversible isomerization of the chelating carbon chain of A to the monodentate butadienyl ligand of complex [TpMe2Ir(CHC(Me)C(Me)CH2)(NCMe)2]PF6, which is capable to engage in a water‐promoted CC coupling with the MeCN co‐ligands. The product is an aesthetically appealing bicyclic structure that resembles the hydrocarbon barrelene.
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