ALKYLATION VS PROTOLYSIS - ALTERNATIVE AP PROACHES IN THE REACTIVITY OF L-HYDROXYCYCLOOCTADIENE(1,5) RHODIUM(I) DIMER WITH METHYL-DERIVATIVES OF TI(IV) - SYNTHESIS, X-RAY CRYSTAL STRUCTURAL-ANALYSIS AND HETEROGENEOUS CATALYTIC TESTING OF THE NOVEL OXO-BRIDGED TITANIUM RHODIUM COMPLEX H,RH,TI)-O)4[RH(I)(COD-1,5)]4[TI(IV)((T)C4H9O)2]2)

The reaction of [(mu-OH)Rh(COD-1,5)]2 with CH3Ti(OtC4H9)3 and Cp2Ti(CH 3)2, respectively, is described. Whereas CH3Ti(O(t)C4H9), gives alkyla tion of the Rh(I) complex at low temperatures, the new oxo-bridged com plex {(mu3-O)4[Rh(COD-1,5)]4[Ti(tC4H9O)2]2} (1) is formed at room temp erature in the course of a protolysis reaction. The data of an X-ray s tructural investigation as well as the first results of using 1 as a p recursor in heterogeneous catalyzed hydrogenation reactions are discus sed.