Inhaltszusammenfassung

Reaction of [OVCl2(THF)(2)] with LiOMes yields dimeric [Li(Et2O)(2)OVCl2(mu-OMes)](2) (1) which can be converted with excess LiOMes to the substitution product [Li(THF)(2)OV(OMes)(3)(THF)] (2). Treatment of (1) with LiMes results in the formation of complexes [Li(THF)(3)OVMes(3)] (3) and [Li(THF)(3)OvMes(2)(OMes)] (4). Complex [(Li(THF)(2)Ov(OMes)(2)(mu-OH))(2). 2THF] (6) has been isolated as a by-product of an unknown reaction of [OV(OMes)(3)] and Li. The structures of 1, 2, 3, and 6 have be...Reaction of [OVCl2(THF)(2)] with LiOMes yields dimeric [Li(Et2O)(2)OVCl2(mu-OMes)](2) (1) which can be converted with excess LiOMes to the substitution product [Li(THF)(2)OV(OMes)(3)(THF)] (2). Treatment of (1) with LiMes results in the formation of complexes [Li(THF)(3)OVMes(3)] (3) and [Li(THF)(3)OvMes(2)(OMes)] (4). Complex [(Li(THF)(2)Ov(OMes)(2)(mu-OH))(2). 2THF] (6) has been isolated as a by-product of an unknown reaction of [OV(OMes)(3)] and Li. The structures of 1, 2, 3, and 6 have been determined by X-ray analysis. In 1 (monoclinic, P2(1)/c, a = 9.522(1) Angstrom, b = 19.777(2) Angstrom, c = 12.311(1) Angstrom, beta = 104.45(1)degrees, Z = 2) the vanadium atoms which are bridged by the phenolate ligands show a square-pyramidal coordination sphere. The central atom in 2 (monoclinic, P2(1)/c, a = 17.755(2) Angstrom, b = 11.629(1) Angstrom, c = 20.956(3) Angstrom, beta = 113.98(1)degrees, Z = 4) has a bipyramidal environment which is realized by coordination of a THF donor molecule. The (THF)(2)Li fragment is bound via bridging phenolate ligands. The structure of 3 (orthorhombic, P2(1)2(1)2(1), a = 15.465(2) Angstrom, b = 15.456(2) Angstrom, c = 15.469(2) Angstrom, Z = 4) is built up by two tetrahedrons linked by the oxo atom. Dimeric 6 (triclinic, <P(1)over bar >, a = 10.780(4) Angstrom, b = 11.428(2) Angstrom, c = 13.734(3) Angstrom, alpha = 77.24(2)degrees, beta = 84.79(2)degrees, gamma = 74.35(2)degrees, Z = 1) has a structure similar to 1. The vanadium atoms are bridged by two OH groups while phenolate ligands link the lithium cations with the vanadium atoms. » weiterlesen» einklappen

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