Abstract
The zirconocene alkyne complexes Cp 2Zr(THF)(Me 3SiCCSiMe 3) ( 1) and Cp 2Zr(py)(Me 3SiC CSiMe 3) ( 2) react with acetone to yield the new zirconadihydrofurane complex Cp 2 ZrOC(Me 2) C(SiMe 3)C (SiMe 3) ( 3). Reaction of 3 with tolan gives, under substitution of the alkyne moiety, a further dihydrofurane compound Cp 2 ZrOC(Me 2)C(Ph)C (Ph) ( 4). Complexes 3 and 4 are characterized by NMR and X-ray structure analyses. They are compared with the known titanocene complex Cp 2 TiOC(Me 2)C(Ph)C (Ph) ( 5) to study the influence of the metals M = Ti, Zr and the substituents R = Ph, SiMe 3 in selected metalladihydrofuranes Cp 2 MOC(Me 2)C(R) C (R). Although the structures of complexes 3 and 4 are similar, the complexes display different reactivities. Thus 3 is capable of reacting with tolan, CO 2 and water at room temperature, while 4 is inactive towards these compounds under the same conditions.
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