Institut für Anorganische Chemie der Universität Würzburg, Am Hubland, D-97074 Würzburg Deutschland
Abstract:
The η3-allyliridium complexes Ir(η3-2-RC3H4)(PiPr3)2] (2, 3) have been prepared in a one-pot reaction from IrCl(C2H4)2]2, 2-RC3H4Li and PiPr3 in 70% yield. Compounds 2 and 3 react spontaneously with H2 to give IrH5(PiPr3)2] (7) and with excess PhC=CH and MeCCH to give Ir(CCPh)3(PiPr3)2] (5) and Ir(CCMe)2(CMe=CH2)(PiPr3)2] (6), respectively. From 2 (or 3) and two equivalents of PhCCH the complex IrH(CCPh)2(PiPr3)2] (4) has been obtained. Treatment of 2 or 3 with CF3CO2H does not lead to a cleavage of the allyl-metal bond but affords the allyl(hydrido)-iridium(III) complexes IrH(η3-2-RC3H4)(η1-P2CCF3)(PiPr3)2] (8, 9) in almost quantitative yield.