摘要：

A series of early transition metal organometallic derivatives containing the ancillary ligand 2,6-diphenylphenoxide (OAr-2,6Ph 2) have been synthesized. Compounds of stoichiometry Ti(OAr-2,6Ph 2) 2(R) 2 (R = CH 3, CH 2SiMe 3, CH 2Ph and Ph) and Ti(OAr-2,6Ph) 3(R) (R = CH 3, CH 2SiMe 3) are obtained by treating the corresponding homoleptic alkyl, TiR 4, with the required amount of phenol, HOAr-2,6Ph 2. For the Group 5 metals Nb and Ta, the methyl derivatives M(OAr-2,6Ph 2) 2(CH 3) 3 and M(OAr-2,6Ph 2) 3(CH 3) 2 are obtained via methylation of the corresponding chloro-aryloxides. Besides routine spectroscopic characterization the diphenyl Ti(OAr-2,6Ph 2) 2(Ph) 2 and mono-alkyl Ti(OAr-2,6Ph 2) 3(CH 2SiMe 3) have been structurally characterized by X-ray diffraction techniques. Both molecules contain a pseudo-tetrahedral environment about the titanium atom with short 1.794(3)–1.806(2) Å, TiO distances and large, 153–179°, TiOAr angles. The TiC distances appear normal for these types of compounds.

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