Oxalate compounds

In 1965, Rauhut et al. [73] reviewed the oxalyl chloride CL system and showed that oxalyl esters could be used for this system instead of oxalyl chloride. Since then, they synthesized a number of oxalates including oxamides and established a new, potent luminescent system, namely the peroxyoxalate CL (PO CL) system. Much work has been carried out to synthesize suitable oxalic compounds. The first study dealing with different reagents was published in 1967 by Rauhut et al. [98] for the American Cyanamid Company with the purpose of developing... 

Early research suggested that the key intermediate in the POCL reaction was 1,2-dioxetandione (structure II in Fig. 5) [2, 3], which is formed following the multistage nucleophilic attack by the hydroperoxide ion on one of the carbonyl carbons in the oxalate compound. This series of reactions is proposed to occur... 

Reaction 5. Another aspect of the reaction chemistry of Mn(III) is demonstrated by the classic kinetic studies of the decomposition chemistry of manganese (III) oxalate complexes (35, 36). These studies derive from an earlier discussion of the synthesis of manganese (III)-oxalate compounds (37). A similar set of kinetic and synthetic investigations, have been summarized for the manganese (III )-malonate complexes (38, 39). Both sets of studies confirm that Mn(III) has a particularly strong... 

Potassium tris(malonato)chromate(IlI) trihydrate is a blue-green compound which is very soluble in water. The cis isomer of potassium diaquabis(malo-nato)chromate(III) trihydrate is purple and also very soluble in water. The trans isomer is violet and fairly soluble in water, but it is more soluble than the analogous oxalate compound. All three compounds exhibit two absorption maxima in their visible absorption spectra, listed in Table I. 

It is reasonable to draw the alkoxide attacking the S-oxalate compound directly, rather than having CD intervene. 

A variety of molecular patterns occur in uranyl oxalate compounds. Apart from the simple uranyl oxalate trihydrate, four other oxalate compounds containing the uranyl ion have been synthesized and their structures investigated. 

From on-line coupled TG-MS and TG-FTIR measurements, in combination with quantitative chemical analysis, the chemical formula for an unknown bismuA oxalate compound was deduced to be Bi(NH4)(C204)2 3.71(6)H20 by Vanhoyland et al. [78], Solution of the crystallographic structure on the basis of X-ray powder data proved this formula to be correct. Bi is 8-fold coordinated by oxygen from the oxalate anions. Because these BiOg polyhedra do not share any edges or vertexes, an open framework is formed with water and ammoniiun molecules between. As a result, water can easily be removed, which is clearly indicated by the rapid initial mass loss in the TG cxu e. 

Izzo, 1., Cmmbie, R., Solladie, G., and Hanquet, G. (2005) Enantioselective sulfoxide-directed preparation of 1,2-diols from oxalic compounds formal synthesis of the 10-membered lactone core of ascidiatrienolides and didemnilactones. Tetrahedron Asymmetry, 16,1503-1511. 

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