Gallium alkoxides

Metal-Oxygen Bond Lengths, M—O—C Angles, and Torsion Angles for Three-Coordinate Aluminum and Gallium Alkoxides and Aryloxides... 

Like the three-coordinate aluminum and gallium alkoxides, the corresponding thiolates, selenolates, and tellurolates require very bulky substituents at the chalcogen atom to ensure a low metal coordination number. In addition, the steric requirements associated with the preservation of the low coordination number at the metal are increased by the longer M—S and M—Se bond lengths. The ten examples of low-coordinate,... 

Gallium alkoxides can be prepared by the methods employed for aluminum.539 Ga(OMe)3, a polymeric material, decomposes without melting but can be sublimed under vacuum. Ga(OEt)3, m.p. 144 °C, Ga(OPr")3 and Ga(OBun)3 are more volatile than Ga(OMe)3, and these are tetrameric in solution. Ga(OPr )3, a liquid, and Ga(OBu )3 have dimeric structures... 

Gallium alkoxides physical properties, 345 Gallium complexes dimethyl sulfoxide, 488 phthalocyanines, 863 porphyrins, 821 Gallium(III) complexes porphyrins evolution, 961 tropolones rearrangement, 382 Gallium isopropoxides synthesis... 

Concerning the application of gallium alkoxides, one can mention the selective catalytic activity of Ga(OPh)3in the condensation reactions of isobutene with phenols. In(OR)3 is used for the preparation of solutions for production of ln203 and In2Oj-related conduction films [1618] and also in the synthesis of volatile precursors for MOCVD deposition of In2Oj [830]. 

In 2001, Chisholm s group reported a (3-diiminate (BDI) gallium-OSiMe3 complex which was unreactive for LA ROP the authors cited substrate binding as the limiting step [76]. Recently, a gallium alkoxide initiator (11) has been reported as an efficient polymerization initiator [72]. The dimeric complex was formed by reaction of GaMe3 with (A)-methyl lactate (Fig. 15). 

Like their aluminum counterparts, gallium alkoxides are susceptible to hydrolysis, giving Ul-defined products. Methanolysis of hydrated Ga + ions produces Ga(OMe) + and Ga(OMe)2+ in solvated forms, as well as polymeric complexes. Ga(OPh)3 reacts with boiling MeOH or EtOH to form the corresponding alkoxide. Reaction of the trialkoxide compounds with other metal alkoxides, for example, LiOR, results in the formation of four-coordinate complex anions of the type [Ga(OR)4] A recent review of sesquihahdes/oxides... 

Gallium alkoxides are also volatile compounds. For example, even the lowest member of the series (the insoluble trimethoxide) has been sublimed at 275-280°C under 0.5 mm pressure. The ethoxide and higher normal alkoxides are also volatile and ebulUoscopic molecular weight determinations in benzene indicated that these normal alkoxides were tetrameric in character. Mehrotra and co-workers observed... 

Bidell W., Shklover V.A., Berke H. Synthesis and structural characterization of new copper complexes and the copper-barium-alkoxide complex BaCu4(0C(R)C(H)C(R)0)4(0R )2(H0R )4 (R = C(CH3)3,R = CH2CH20CH3). Inorg. Chem. 1992 31 5561 Bindal S.R., Kapoor P.N., Mehrotra R.C. Reactions of gallium alkoxides with acyl halides. Inorg. 

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