The air-stable iridium chlorodihydride complex IrH2Cl[(iPr2PC2H4)2NH], 1, was prepared from the reaction of [IrCl(coe)2]2 with the pincer ligand (iPr2PC2H4)2NH in 2-propanol at 80 °C. Reaction of 1 with KOtBu in THF resulted in the formation of the air-sensitive amidodihydride complex IrH2[(iPr2PC2H4)2N], 2, which in the presence of 2-propanol readily forms the moderately air-stable trihydride complex IrH3[(iPr2PC2H4)2NH], 3. The trihydride and amidodihydride complexes in the absence of a base are exceptionally active catalysts for the transfer hydrogenation of ketones in 2-propanol.

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Hydrogenation O 0220A Family of Active Iridium Catalysts for Transfer Hydrogenation of Ketones. -The iridium complex shown efficiently catalyzes the transfer hydrogenation of various aromatic and aliphatic ketones with 2-propanol. It is shown that several precatalysts are similarly effective in this reaction. The mechanism is discussed. -(CLARKE, Z. E.; MARAGH, P. T.; DASGUPTA, T. P.; GUSEV, D. G.; LOUGH, A. J.; ABDUR-RASHID*, K.; Organometallics 25 (2006) 17, 4113-4117; Kanata Chem. Technol. Inc., Toronto, Ont. M5G 1L7, Can.; Eng.) -Mischke 50-051

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