4,4′-Biphenolate complexes of titanium and zirconium

Trichloro monophenoxide complexes of titanium(IV)

“…10 Uncharacterised [TiCl 3 (OC 6 H 4 CMe 3 -2)] has been evaluated for regioselective ortho-acylation 11 and the 3,3Ј,5,5Ј tetrasubstituted biphenolate (tsb) complexes [{TiCl 3 (L)} 2 (tsb)] (L = diethyl ether or tetrahydrofuran) prepared. 12 The complex [TiCl 3 -{OC 6 H 3 (CMe 3 ) 2 -2,6}] has been tested in the presence of methylaluminoxane [(MeAlO) n , MAO] co-catalyst for the co-polymerisation of styrene and ethylene 13 and its crystal structure determined. 14 We report here a comprehensive study of the monophenoxides [TiCl 3 (OAr)] (Ar = unsubstituted or substituted phenyl group) prepared for use in catalytic applications.…”

Synthesis of 2,7-Disubstituted Derivatives of 1,8-Naphthalenediol. Unusual Structure of a Chlorotitanium 1,8-Naphthalenediolate

“…Treatment of simple phenols with TiCl 4 in a 1:1 ratio is known to produce trichlorotitanium phenoxides , we hoped that the reactions of 1,8-naphthalenediols 2 , 8 , and 12 with TiCl 4 in a 1:2 ratio would give derivatives of bidentate Lewis acid 15 rather than alternative structures derived from monodentate dichlorotitanium naphthalenediolate 16 .…”

“…Treatment of simple phenols with TiCl 4 in a 1:1 ratio is known to produce trichlorotitanium phenoxides. 9 Because titanium aryloxides tend to have Ti-O-C angles close to 180°, 10,11 we hoped that the reactions of 1,8-naphthalenediols 2, 8, and 12 with TiCl 4 in a 1:2 ratio would give derivatives of bidentate Lewis acid 15 rather than alternative structures derived from monodentate dichlorotitanium naphthalenediolate 16. The addition of excess diisopropyl ketone to a suspension produced by treating 1,8-naphthalenediol (2) in CHCl 3 with 2 equiv of TiCl 4 yielded a homogeneous solution from which deep purple crystals formed.…”