Phosphorus-Oxygen-Sulphur Compounds

Phosphorus-Oxygen-Sulphur Compounds. The reaction of methylmagnesium iodide with 5 -alkylphosphonthioates, Ph(SMe)P(0)0R, involves either the displacement of [SMe] with retention of configuration, or of [OR] with inversion. The suggested intermediate is (5). The alkaline hydrolysis of Me(SR)P(0)0Et occurs with inversion 

Phospkorus-Oxygen-Nitrogen Compounds. The alkaline hydrolysis of cyclic phos-phoramidates (6) can be rationalized in terms of trigonal-bipyramidal intermediates in which sufficiently basic nitrogens will occupy an apical position. Differences in the behaviour of aryl derivatives (7) and their acyclic analogues (8) have been discussed. Square-pyramidal intermediates are preferred in the alkaline 

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Whether one looks at C or X attack, the data given in Table 24 suggest that polarizability or the softness factor is important in determining nucleophilicity. Phosphorus nucleophiles appear to be more reactive than structurally similar nitrogen nucleophiles, e.g. with chlorophenylacetylene, A (Bu3P, DMF)/A (TED, MeCN) = 260 at 30 °C As compared with oxygen, sulphur compounds are... 

Boitiaux JP, Cosyns JP, Robert E. Additive effects in the selective hydrogenation of unsaturated hydrocarbons on platinum and rhodium catalysts II. Influence of various compounds containing phosphorus, oxygen, sulphur and chlorine on the catalytic performance of platinum catalyst. Appl Catal. 1989 49 235. 

The simultaneous analysis of orthophosphate, glycerol phosphates, and inositol phosphates has been achieved by spectrophotometric analysis of the molybdovanadate complexes. Also, a sensitive and selective chemiluminescent molecular emission method for the estimation of phosphorus and sulphur is described, which is based on passing solutions into a cool, reducing, nitrogen-hydrogen diffusion flame. For organic compounds it was usually necessary to prepare test solutions by an oxygen-flask combustion technique. 

Naturally-occurring oil, a mixture of hydrocarbons with a small proportion of other organic compounds containing sulphur, phosphorus, oxygen and nitrogen the exact composition varies according to source. Petroleum Oils... 

The abbreviations Pm, PIV, and Pv refer to the co-ordination number of phosphorus and the compounds in each subsection are usually dealt with in this order. A number of relevant theoretical and inorganic studies are included in this chapter. In the formulae the letter R represents hydrogen, alkyl, or aryl, X represents electronegative substituents, Ch represents the chalcogenides (usually oxygen and sulphur), and Y and Z are used to indicate a wide variety of substituents. 

The Composition of Organic Compounds has already been partially shown. They usually contain carbon and hydrogen, with or without oxygen, or nitrogen, or both a few contain sulphur, phosphorus, and other elements. When burned or heated they yield carbon, or carbon dioxide, water vapor, ammonia gas, sulphur compounds, etc., according to their composition. The general character of typical organic compounds may be shown by a study of the... 

Because of the strong bonds it makes with oxygen, nitrogen and sulphur, phosphorus forms a large number of polymers. Polyphosphate anions have —P—O—P— linkages and so have the oxygen-linked compounds ... 

Organic contaminants are compounds with a carbon skeleton, usually associated with atoms of hydrogen, oxygen, nitrogen, phosphorus and sulphur (see Section... 

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