Structure and chemistry of the complex tetrakis(.eta.5-pentamethylcyclopentadienyl)tetrakis(.mu.3-chloro)tetraruthenium(II): a useful precursor to (pentamethylcyclopentadienyl)ruthenium(0), -(II), and -(IV) complexes

A single-crystal X-ray structural analysis of the complex (Cp*Ru({mu}{sub 3}-Cl)){sub 4} (1, Cp* = {eta}{sup 5}-C{sub 5}(CH{sub 3}){sub 5}) has been performed (triclinic, P{anti 1} (No. 2); a = 11.281 (5); b = 11.354 (4); c = 18.846 (5) {angstrom}; {alpha} = 82.20 (2){degree}, {beta} = 82.03 (3){degree}, {gamma} = 65.45 (4){degree}; V = 2,166.3 {angstrom}{sup 3}, Z = 2). The complex contains a distorted cubic array of ruthenium and chlorine atoms. The complex 1 is a useful precursor to Ru(0), Ru(II), and Ru(IV) pentamethylcyclopentadienyl complexes. The complex (Cp*Ru({mu}{sub 3}-I)){sub 4} has also been prepared and reacts with 1,3-butadiene to yield Cp*Ru({eta}{sup 4}-s-cis-1,3-butadiene)I, which has been structurally characterized by a single-crystal x-ray analysis (monoclinic b, P2{sub 1}/c (no. 14); a = 7.177 (2); b = 14.362 (3); c = 13.788 (2) {angstrom}; {beta} = 93.39 (1){degree}; V = 1,418.7 {angstrom}{sup 3}, Z = 4).