INTERACTION OF THE ZIRCONOCENE ALKYNE COMPLEX CP2ZR(THF)(ME3SIC2SIME3) AND THE BINUCLEAR ZIRCONIUM SIGMA-ALKENYL COMPLEX (CP[MU-(ETA(1)-ETA(5)-C5H4)]ZR[C(SIME3)=CH(SIME3)])2 WITH CARBON-DIOXIDE AND WATER

It has been shown that the bis(trimethylsilyl)acetylene complex of zirconocene Cp2Zr(THF)(Me3SiC2SiMe3) (1) and the binuclear sigma-alkenyl complex of zirconium {Cp[mu-(eta1:eta5-C5H4)]Zr[C(SiMe3)=CH(SiMe3)]12 (2) readily react with carbon dioxide at room temperature to form the dimeric zirconafuranone metallacycle [Cp2ZrC(SiMe3)=C(SiMe3)C(O)O]2(3). Under similar conditions the reaction of Cp2Zr(THF)(Me3SiC2SiMe3) and {Cp[mu-(eta1:eta5-C5H4)]Zr[C(SiMe3)=CH(SiMe3)]}2 with water affords the zirconoxane complex [Cp2ZrC(SiMe3)=CH(SiMe3)]2O (4). The structures of the obtained complexes have been established by X-ray structure analysis.