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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/4109

Title: Synthesis, structure, and catalytic properties of V(IV), Mn(III), Mo(VI), and U(VI) complexes containing bidentate (N, O) oxazine and oxazoline ligands
Authors: KANDASAMY, K
SINGH, HB
BUTCHER, RJ
JASINSKI, JP
Keywords: transition-metal-complexes
baeyer-villiger oxidation
coordination chemistry
asymmetric catalysis
crystal-structure
2-(2'-hydroxyphenyl)oxazoline ligands
dioxomolybdenum(vi) complexes
molecular-structures
manganese(iii)
derivatives
Issue Date: 2004
Publisher: AMER CHEMICAL SOC
Citation: INORGANIC CHEMISTRY, 43(18), 5704-5713
Abstract: Synthesis of seven complexes containing oxazoline {[(L(1))(2)V=O] (4), [(L(1))(2)MoO(2)] (5), [(L(1))(2)UO(2)] (6); HL(1) (1) [HL(1) = 2-(4',4'-dimethyl-3'-4'-dihydroxazol-2'-yl)phenol]}, chiral oxazoline {[(L(2))(2)UO(2)] (7); HL(2) (2) [HL(2) = (4'R)-2-(4'-ethyl-3'4'-dihyroxazol-2'-yl)phenol]}, and oxazine {[(L(3))(2)V=O] (8), [(L(3))(2)Mn(CH(3)COO(-))1 (9), [(L(3))(2)CO] (10); HL(3) (3) [HL(3) = 2-(5,6-dihydro-4H-1,3-oxazolinyl)phenol]} and their characterization by various techniques such as UV-vis, IR, and EPR spectroscopy, mass spectrometry, cyclic voltammetry, and elemental analysis are reported. The novel oxazine (3) and complexes 4, 5, 8 and 9 were also characterized by X-ray crystallography. Oxazine 3 crystallizes in the monoclinic system with the P2(1)/n space group, complexes 4 and 9 crystallize in the monoclinic system with the P2(1)/c space group, and complexes 5 and 8 crystallize in the orthorhombic system with the C222(1) space group and the P2(1)2(1)2(1) chiral space group, respectively. The representative synthetic procedure involves the reaction of metal acetate or acetylacetonate derivatives with corresponding ligand in ethanol. Addition of Mn(OAc)(2).4H(2)O to an ethanol solution of 3 gave the unexpected complex Mn(L(3))(2).(CH(3)COO(-)) (9) where the acetate group is coordinated with the metal center in a bidentate fashion. The catalytic activity of complexes 4-9 for oxidation of styrene with tert-butyl hydroperoxide was tested. In all cases, benzaldehyde formed exclusively as the oxidation product.
URI: http://dx.doi.org/10.1021/ic0352093
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4109
http://hdl.handle.net/10054/4109
ISSN: 0020-1669
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