Phosphorus compounds and complexes

V.6.2 Phosphorus compounds and complexes V.6.2.1 Solid nickel phosphorus compounds... 

X.2 Phosphorus compounds and complexes X.2.1 Solid and gaseous thorium phosphides... 

Applications of Compounds and Complexes Containing Phosphorus-Chalcogen Bonds... 

G. Verga, High resolution gas chromatographic determination of nitrogen and phosphorus compounds in complex organic mixtures by tunable selective thermionic detector, J. Chromatogr., 279 657-665 (1983). 

Barrow (1993) successfully applied this model to phosphate adsorption by taking into account pH and electrolyte concentration. The use of this equation to describe organic phosphorus adsorption can be important as well, due to the high charge density of molecules such as myo-inositol hexakisphosphate, but the complexity of organic phosphorus compounds and the different mechanism of adsorption can make the model difficult to apply. 

Peroxyl radicals are quite selective towards H-atom abstraction and it is usually possible to estimate where in a molecule reaction has taken place. Rate constants are, therefore, quoted on a per hydrogen basis whenever possible. In many instances reaction products have indicated the relative reactivity of different types of hydrogen atoms in an organic compound. This has, however, not always been done and in these cases overall rate constants are quoted. It is sometimes difficult in the case of molecules with several functional groups to give reactivity on a per hydrogen basis. In some instances, particularly reactions with trivalent phosphorus compounds and transition metal complexes, stoichiometric factors are not known, overall rate constants are, therefore, reported for these compounds. 

Since many inorganic compounds and complexes contain groups or atoms dealt with previously, the earlier chapters of this book should also be studied for any relevant information. For example, the chapters on silicon, boron, phosphorus and polymers contain a great deal of information relevant to inorganic compounds. Also, if interest is in, say, metal-olefin compounds, then sections dealing with alkenes should be examined, not only because the band positions of the free ligand should be known but also because some bands for these complexes may also be included in these sections. 

C) 370/656X brittleness after exposure to temperatures between about 700 to 1. OSO-F. stainless steels. chromium stainless steels, over 13% Cr and any 400 Series martensitic chromium stainless steels low in carbon content (high Cr/C ratio). complex chromium compound, possibly a chromium-phosphorus compound. chromium steels at temperatures above about 700 F (370 C) keep carbon up in martensitic chromium steels and limit Cr to 13% max. 

Within the wide range of phosphorus compounds described as activating agents for polyesterification reactions,2,310 triphenylphosphine dichloride and diphenylchlorophosphate (DPCP) were found to be the most effective and convenient ones. In pyridine solution, DPCP forms a A-phosphonium salt which reacts with the carboxylic acid giving the activated acyloxy A -phosphonium salt. A favorable effect of LiBr on reaction rate and molar masses has been reported and assumed to originate from the formation of a complex with the A-phosphonium salt. This decreases the electron density of the phosphorus atom... 

A comprehensive review of the preparation, reactions, and n.m.r. spectra of phosphorus-fluorine compounds has appeared. This year s literature has been notable for the first detailed applications of ab initio SCF-MO calculations to the problems of bonding in halogenophosphines and their derivatives. - Comparison of the results of such theoretical calculations with experimental data obtained from photoelectron spectra shows a good correlation in the case of phosphorus trichloride and phosphoryl chloride, and of phosphorus trifluoride and its borane complex. ... 

Two papers have appeared on the reactions of halogenophosphines with tervalent phosphorus compounds. In a detailed study of the reactions at 20 °C of a range of tertiary phosphines with phosphorus trichloride, dichlorophenylphosphine, and chlorodiphenylphosphine, it has been shown that, in general, 1 1 adducts are formed, provided that the tertiary phosphine is a good nucleophile. With diphenylchlorophosphine, for example, an adduct (18) is formed with dimethylphenylphosphine, but not with diphenylmethylphosphine, although the relative importance of steric and electronic factors remains to be established. The related reactions of phosphorus trichloride and of dichlorophenylphosphine are much more complex, and the initial crystalline products are not amenable to analysis. The reactions at 280 °C of a similar system have been shown to lead to halogen exchange, e.g. the conversion of (19) to (20). 

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