C-H and C-C bond activations of terminal alkynes in the presence of a heteronuclear Ru3Au cluster

The reaction of compound [Ru-3(CO)(10)(mu-Cl)(mu-AuPPh3)] (1) with terminal alkynes HC CR; (R = C6H4-4-CH3, C6H3-2,5-(CH3)(2), C6H2-2,4,5-(CH3)(3), C(CH3) - CH2, Si(CH3)(3)), under very mild conditions yielded isostructural compounds [Ru-3(CO)(9)(mu-AuPPh3)(mu(3)-eta(2)-perpendicular to-C CR)] (R=C6H4-4-CH3 (2), C6H3-2,5 -(CH3)(2) (3), C6H2-2,4,5-(CH3)(3) (4), C(CH3)]CH2 (5), Si(CH3)(3)) (6)) respectively; where the alkynes suffer oxidative additions to the metallic fragment coordinating as acetylide groups in a mu 3-eta(2)-perpendicular fashion by breaking the C-(sp)-H bond of the alkynes. The AuPPh3 fragment remains without change in all compounds. All of these clusters have been characterized in solution by i.r. and n.m.r. spectroscopy and their structures have been established by single crystal Xeray diffraction studies. (C) 2011 Elsevier B.V. All rights reserved.