TRANSITION-METAL COMPLEXES OF TWO VALENCE TAUTOMERS OF A BULKY PHENOXIDE, 2,6--Bu-t2-4-MeC6H2O- (ArO-); PREPARATION AND CRYSTAL AND MOLECULAR STRUCTURE OF A PHENOXYTITANIUM(III) AND A CYCLOHEXADIENONYLRHODIUM(I) COMPLEX, AND 5)(PPh3)2>

Article abstract of DOI:10.1016/S0022-328X(00)83057-0

The 2,6-di-t-butyl-4-methylphenoxo ligand (ArO^-) is ambidentate, giving rise to the O-bonded 15-electron d¹ and the η⁵--bonded 18-electron d⁸ complex 5)(PPh3)2>, obtained from <2>-LiOAr and (PPh3)2>-ArOH, respectively; the average Ti-C(η) distance is 2.362(10) Angstroem, Ti-O 1.892(2) Angstroem, and O-C(of Ar) 1.352(3) Angstroem, and TiOC 142.3(2) deg; in the Rh^I complex, C(2)-C(6) are coplanar (with C-C(av.) 1.38(2) Angstroem), C(1)-O 1.28 Angstroem, and Rh to C(2)-C(6) bond lengths are in the range 2.19-2.65 Angstroem.