- Reaction courses for formation of early transition metal phenoxides
-
The 1 : 1 and 1 : 2 reactions of TiCl4 with Me3SiO-2,6-(CH3)2C6H3 produced TiCl32(THF)2 (1) and TiCl22(THF)2 (2), respectively, bearing six-coordinated geometry around Ti.The compound 2 assumes the cis-geometry regarding the two phenoxy groups and THF is coordinated in the trans position of the phenoxy groups.Similarly, the 1 : 1 and 1 : 2 reactions of NbCl5 with the trimethylsilylphenyl ether provided NbCl42(THF) (7) and NbCl32(THF) (8), respectively, with octahedron structure.The THF molecule again locates in the trans position of a phenoxy group in both cases and the two phenoxy groups of 8 locate in the cis position.Tungsten mono-phenoxide, WCl52 (12), also has octahedron structure.In cases of tungsten bis-phenoxides, WCl42 (13) and WCl42 (14), the former has trans structure while the latter has cis structure regarding the phenoxy groups.A unique square pyramidal geometry has been observed in the tetrakis(phenoxy) tungsten, WCl4 (16).Key words: Titanium; Niobium; Tungsten; Zirconium; Tantalum
- Yasuda, Hajime,Nakayama, Yuushou,Takei, Kazuo,Nakamura, Akira,Kai, Yasushi,Kanehisa, Nobuko
-
p. 105 - 116
(2007/10/02)
-
- Facile Synthesis of Group 4-6 Transition Metal Phenoxides and X-Ray Structures of TiCl22(THF)2 and NbCl32(THF)
-
Reactions of Group 4-6 metal halides with 2,6-dimethylphenoxy(trimethyl)silane in THF afford pure compounds of type MXlm(THF)n (M=Ti, Zr, Hf with l=3, m=1, n=2 or l=2, m=2, n=2; M=Nb, l=4, m=1, n=1 or l=3, m=2, n=1; M=W, l=5, m=1, n=0 or l=4, m=2, n=0) in >75percent yields.Geometries of TiCl22(THF)2 and NbCl32(THF) were determined by the X-Ray diffraction method.
- Kanehisa, Nobuko,Kai, Yasushi,Kasai, Nobutami,Yasuda, Hajime,Nakayama, Yuushou,et al.
-
p. 2167 - 2170
(2007/10/02)
-