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The dienyl cluster compounds [M,H(CO),(p,-o:q2:q2-C6H7)] ( M = Ru or 0 s ) have been synthesised from [Os,H,(CO),,] or [M,(CO),,(MeCN),] ( M = R u or 0 s ) with cyciohexa-1.3-diene. The molecular and crystal structure of [ Ru,H (CO),(C,H,)] has been established by single-crystal X-ray diffraction analysis: monoclinic, space group P2,, a = 8.487(6), b = 12.031 (3). c = 9.073(2) A, p = 92.43(4)' and Z = 2. The cyclohexadienyi ligand is involved in one CJ and two 7c interactions with the metal triangle, while the H (hydride) ligand bridges the long Ru-Ru bond [3.052( 1 ) A]. The other two Ru-Ru bond lengths are the same [2.837(1) A] and comparable to those observed in [Ru,(CO),(~,-q2:q2:qz-C,H,)I. The H( hydride) position afforded by the diffraction experiment has been compared with the result of potentialenergy minimization procedures. The molecular organization within the lattice has been explored by means

The solid-state structure of the [2.2]PHANE-PHOS-transition-metal complex rac- [Pd(4,[2.2]paracyclophane)Cl 2 ] has been established by single-crystal X-ray diffraction. The P-Pd-P bite angle is ideally suited to catalytic processes such as carbon-carbon cross-coupling reactions, which involve reductive elimination as the rate-determining step.

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