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|標題:||Reactions of Ti(O-i-Pr)Cl-3 with bidentate ligands containing hydroxy and methoxy groups. The crystal structure of Ti(O-i-Pr)Cl-3(HOCH2CH2OCH3) and the H-1 variable-temperature NMR studies of solution structures of Ti(O-i-Pr)Cl-3(HOCH2CH2OCH3) and Ti(O-i-||作者:||Lee, C.S.
|關鍵字:||crystal structure complexes;titanium complexes;alkoxide complexes;bidentate ligands complexes;nuclear-magnetic-resonance;state characterization;titanium complexes;group exchange;solid-state;mechanism;chemistry;alkoxides;inversion;chloride||Project:||Inorganica Chimica Acta||期刊/報告no：:||Inorganica Chimica Acta, Volume 285, Issue 2, Page(s) 254-261.||摘要:||
Ti(O-i-Pr)Cl-3 reacts with 2-methoxyethanol in C6H6, with 2-methoxyethanol in the presence of NEt3 in CH2Cl2 or in THF or with 1,2-dimethoxyethane to give Ti(O-i-Pr)Cl-3(HOCH2CH2OCH3) (1), [Ti(O-i-Pr)Cl-3(OCH2CH2OCH3)](-)(HNEt3+) (2), Ti(O-i-Pr)Cl-2(OCH2CH2OCH3)(THF) (3), and Ti(O-i-Pr)Cl-3(CH3OCH2CH2OCH3) (4. The H-1 variable-temperature NMR study of 1 suggests the presence of several species in solution and the likely structures of these species are discussed. The H-1 VT NMR study and the line-shape calculations on 4 suggest a bond-rupture exchange process through dissociation of the methoxy donors trans to the 2-propoxy to give a trigonal bipyramidal intermediate followed with re-attachment of the dangling methoxy. The solid state structure of 1 with the hydroxy donor trans to the 2-propoxide group suggests a relative bonding order of ROR' > ROH. (C) 1999 Elsevier Science S.A. All rights reserved.
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