Oxygen-containing compounds preparation

When it is desired to produce oxygen on a laboratory scale, the decomposition of some oxygen-containing compound is the usual procedure. Historically, oxygen was prepared by the decomposition of a metal oxide such as HgO. 

Salts of transition metals are widely used in technological processes for the preparation of various oxygen-containing compounds from hydrocarbon raw materials. The principal mechanism of acceleration of RH oxidation by dioxygen in the presence of salts of heavy metals was discovered by Bawn [46 19] for benzaldehyde oxidation (see Chapter 1). Benzaldehyde was oxidized with dioxygen in a solution of acetic acid, with cobalt acetate as the catalyst. The oxidation rate was found to be [50] ... 

CO2 is the gas generally used for mass-spectrometric analysis. More recently CO and O2 have also been used in high temperature conversion of organic material and in laser probe preparation techniques. A wide variety of methods have been described to liberate oxygen from the various oxygen-containing compounds. 

Another example of the use of deoxidation of oxygen-containing compounds for their structural analysis was given by Wi jnands et al.68, who investigated the structure of novolaks, prepared by polycondensation of formaldehyde with phenol, />-cresol and w-cresol. The novolaks were transformed into saturated hydrocarbon mixtures by direct hydrogenation. Ultimate analysis of the hydrocarbons confirmed the linear structure of the novolaks ... 

On a laboratory scale, O2 can be prepared by decomposition of certain oxygen-containing compounds. Heavy metal oxides, such as HgO, are not thermally stable and are fairly easily decomposed ... 

It has also been claimed that organic oxygen-containing compounds may be prepared by the action of carbon monoxide on aliphatic or hydro-aromatic compounds under pressure in the presence of such catalysts as... 

It is thought that unreduced metal ions might play an important role in the insertion mechanism (electrophilic catalysis). The type of metal, the method of preparation, and additives present can influence the concentration and stability of these ions. Oxygen-containing compounds can oxidize metal surfaces and so produce electrophilic sites [53]. 

The investigation of the reactions of ozone with ketones is of interest from the viewpoint of the theory of reactivity, the ozone ehemistry, preparation of oxygen-containing compounds, and the degradation and stabilization of organic materials. In partieular, the ozonation of methylelhylketone (MEK) [53-55] delded acetie aeid (AcAc), diacetyl and hydroperoxide as... 

A comprehensive description of the various preparation techniques is given in the review by Schwarzkopf and Kieffer (1953). It should be borne in mind that these carbides, like the other systems, are susceptible to oxycarbide formation. For this reason, it is advisable not to use the oxide or oxygen-containing compounds for their preparation unless a final heating above 1500° in vacuum follows. With this precaution, pure carbides are easily obtained. 

Oxygen can be prepared in small quantities by decomposing certain oxygen-containing compounds. Both the Swedish chemist Karl Wilhehn Scheele and the British chemist Joseph Priestley are credited with the discovery of oxygen. Priestley obtained the gas in 1774 by heating mercury(II) oxide. 

January 1999 A process is described for preparing oxygen-containing compounds by reaction of aromatic hydrocarbons with CO in bquid or SCCO2 solvent and photoirradi-ating in the presence of a transition metal complex containing a phosphine compound. Examples include synthesis of benzaldehyde and benzyl alcohol from benzene. 

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