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The new pincer ligand 1,6-bis((tert-butylphosphino)methyl)-1,3,5-cycloheptatriene is metalated by Ir(CO) x Cl at the 7-position to give a pincer complex. This complex when treated with LiBEt 3 H gives a mixture of products which result from the unusual migration of both an ethyl group and the replacement of the chlorine atom with a hydride. Individual components of the mixture can be prepared separately by treatment of the pincer complex with NaH to give dehydrochlorination followed by a prototopic rearrangement and NaBEt 4 , which generates the corresponding ethyl derivative.