Electrophile (H+, Me+)-mediated carbon-carbon bond formation between eta(3)-allyl and alkynyl groups coordinated to "Cp*Ir"

eta(3)-Allyliridium(III) complexes Cp*Ir(eta(3)-CHPhCHCH2)(-C=C-t-Bu) (2), Cp*Ir(eta(3)-CHPhCHCH-CH=CH(t-Bu))Cl (3H), Cp*Ir(eta(3)-CHPhCHCH-CH=CMe(t-B u))I (3Me), [Cp*Ir(eta(3)-CHPhCHCH-CH=CMe(t-Bu))(NCMe)(+) (4), and Cp*Ir(et a(3)-CHPhCHCH-CH=CMe(t-Bu))(-C=C-t-Bu') (5) have been prepared from the rea ctions of [Cp*Ir(eta(3)-CHPhCHCH2)(NCMe)(+) (1) with H-C=C-t-Bu tin the pre sence of NEt3), HCl, and Mel. The crystal structures of 2 and 5 have been d etermined by X-ray diffraction data analyses. Reactions of 3 and 5 with HCl produce trans,trans-1,3-pentadienes, PhCH=CHCH=CHCH2(t-Bu) (6H) and PhCH=C HCH=CHCHMe(t-Bu) (6Me), and cis,trans,trans-1,3,5-heptatriene, (t-Bu')CH=CH C(Ph)=CHCH=CHCHMe(t-Bu) (8), respectively.