CP-ASTERISK-RU ALKOXIDES WITH SIGMA-BRIDGING PHENOXO GROUPS, X-RAY STRUCTURE OF [CP-ASTERISK-RU(MU-OME)(MU-OC6H3-2,4-(T-BU)(2))]

[CpRuOMe](2) (1) reacts with phenols by successive exchange of one an d two OMe groups for the phenolate group, forming mixed mu-methoxy-mu- phenolato complexes (5) and bis(mu-phenolato) dimeric complexes (6) su ccessively. The latter, by can intramolecular rearrangement, convert i nto CpRu(eta(5)-oxocyclohexadienyl) complexes (7). With phenol and 2- methyl-5-isopropyl-phenol (carvacrol) the stepwise reactions were foll owed by NMR spectroscopy. Using 2,4-di-tert-butylphenol, both the mono (phenolato) (5c) and bis(phenolato) (6c) complexes have been isolated. The latter complex is obtained best from CpRu(proline) (8) and 1. Co mplex 5c was characterized by an X-ray structure. The molecular geomet ry is very similar to the one found for 1.