Abstract
A dichloromethane solution of the cationic carbonyl complex [IrCl 2(CO)(PMe 2Ph) 3)][ClO 4] reacts with aqueous KOH to give [IrCl 2(CO 2H)(PMe 2Ph) 3] which has been characterised spectroscopically. This CO 2H compound is very much more basic and very much less acidic than [IrCl 2(CO 2H)(CO)(PMe 2Ph) 2). Tertiary amines will not deprotonate [IrCl 2(CO 2H)(PMe 2Ph) 3] while Li[N(SiMe 3) 2] leads to decarboxylation products trans, mer- and cis, mer-[IrHCl 2(PMe 2Ph) 3]. The mechanisms of these reactions are considered and the hydroxycarbonyl complex is compared with its formato isomer which decarboxylates much less readily.
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