Cobalt and nickel alkoxides

The first attempts to prepare cobalt and nickel ethoxides were reported in 1936 by Meerwein [1102] and Kandelaki [875]. Application ofNaOR in the exchange reactions could not, however lead to the obtaining of the pure products of purpose as they were insoluble in the parent alcohol. Application of LiOR for this purpose permitted Adams et al. in 1966 to obtain the individual M(OMe)2 — derivatives of id-transition elements in the series from Cr to Cu [6]. In the 1980s Mehrotra et al. have described the homologous series of Ni(OR)2 — from methoxide to r-hexyloxide [99], and also Co(OR)2, where R = Me,Et, Pr [1108]. On the alkoxylation of CoH(N2)(PPh3)3 by esters, phenol, or fluorinated ketones, Hayashi et al. [720] have obtained a series of tetrahedral [Co (OR)(PPh3)3] complexes. 

The major route to insoluble M(OAlk)2 is provided by the metathesis reaction of MC12 with LiOR (method 5). To increase the solubility of NiCl2 in s- 

A special role in the chemistry of nickel and cobalt alkoxide derivatives is played by the poorly soluble methoxide halids studied in detail by the group of Winter [964, 865]. According to the diffuse reflectance spectra, the coordina- 

Rather high stability is observed for the nickel and cobalt derivatives containing the [M4( i3-OMe)4] cubane-like core and heteroligands such as acac, OAr, OC6H4CHO, [M(CO) ],and so on [1771, 1097, 698, 642, 276]. 

The hydrolisis of mixed solutions of Ni and Ti 2-ethoxyethoxide in ROH with subsequent thermal treatment of the dried product at 500 to 700°C was reported as a route to NiTi03 [1425], 

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