Phosphorus-containing acids and

Ion Chromatography. - Organic phosphorus-containing acids and their thio- and dithio- analogues have been analysed by ion chromatography 2 and the microdetermination of phosphorus in organic compounds has been accomplished. ... 

There is a distinct difference between the esters of phosphorus-containing acids with alcohols and ethoxylated structures, on the one hand, and compounds... 

A variety of reaction conditions have been employed for Pudovik-type additions to imines, including the use of additional tertiary amines,323 324 sodium hydride,325 and sodium ethoxide,326/327 as well as monobasic trivalent phosphorus-containing acids.319/328-340... 

Analogues of (751) react with derivatives of phosphorus-containing acids to form 1-phosphoryl-imidazoles (90CHE599). The same compound also silylates ketones to give enol silyl ethers and/or siloxyalkylimidazoles (Scheme 107) (87JC271). 

The toxicokinetics of white phosphorus smoke are likewise unknown. White phosphorus smoke is primarily oxides and acids of phosphorus, with some residual unbumt white phosphorus (refer to Chapter 3 for a detailed description of the composition of white phosphorus smoke). The fates of airborne white phosphorus, and the phosphorus oxides and phosphorus-containing acids originating from the combustion of white phosphorus, are largely unknown. 

Tempesti et al. (238) used organoboronic acids (lib) for the immobilization of Mo(VI). It is assumed that the interaction of Mo occurs through a condensation with the supported acid. Reactions reported with the bimetallic material showed an activity and selectivity comparable to those of homogeneous bimetallic analogs. In a comparable approach, Mo was anchored to immobilized phosphorus-containing acids, for example, of cellulose phosphate (11c) (239) or phosphonate resins (11a) (240). 

Topics relevant to the present Chapter are discussed in general reviews concerned with phosphorus-containing isocyanates, and with the synthesis and uses of organosilyl esters of phosphorus acids. ... 

Interest in the Staudinger reaction of phosphines with azides, and the Mit-sunobu reaction involving nucleophilic attack by phosphorus at nitrogen in esters of diazodicarboxylic acids, has continued. Systems of the type (205) have been obtained from the reactions of secondary arylphosphines with azides. Treatment of these with butyllithium results in deprotonation to form the diaminophosphonium diazaylides (206). Phosphazenes have been prepared from azido-quinolines and -triazines, and also from diazoketones " and polycyanocyclopropanes. The Staudinger reaction has been employed in the synthesis of phosphorus-containing dendrimers, and in new approaches to amide and peptide synthesis. The reaction has also been used in a high-... 

The phosphorus tribromide boiled at 171-173 /ybo mm., 168-170V72S mm., and was prepared in 90-95 per cent yield by adding bromine to a stirred suspension of red phosphorus in carbon tetrachloride. A good fractionating column is necessary. Old red phosphorus containing acids of phosphorus gives a poorer yield. 

A-Phosphorylated imidazoles and benzimidazoles can be made by direct phosphorylation by halides, esters, amides, amidoesters, isocyanates, and thiocyanates of phosphorus-containing acids, or from reaction of phosphonic or phosphinic imidazolides with a sulfonic acid or anhydride <82CB1636>. Stable charge transfer complexes are produced when a 1 1 or 1 2 ratio of imidazole (or benzimidazole) and sulfur trioxide are refluxed in ether, dioxane, THE, or 1,2-dichloroethane. These complexes are stable on storage in the absence of water and have sharp melting points. Indeed, the benzimidazole SO3 complex must be boiled for five hours in water to decompose it. On fusion, the complexes form the C-sulfonic acids (see Section 3.02.5.3.3) <87CHE1084>. Sulfonyl chlorides readily A-sulfonate imidazoles <94JMC332>. 

The Porifera Melythoea and the tree Carya sp. are considered accumulator organisms. Yttrium accumulates in bone and teeth, a phenomenon that is explained by its ability to bind to phosphorus-containing compounds, and to polysaccharides. Nucleic acids have high affinities for yttrium, which binds to phosphate at a ratio of 1 3. Yttrium has stimulatory effects on some fungi and other lower organisms. It is believed that yttrium binds to the surface of cells, without penetrating the cell membrane. 

Earlier, attention was drawn to a novel application of the oxidative desulphurization reaction which occurs between sulphoxides and phosphonothioic acid esters. When 1 mol of the thio acid is allowed to remain in contact with 2 mol of a racemic methyl alkyl sulphoxide for 2 weeks at room temperature, the unreacted sulphoxide is found to be optically active, a result which represents asymmetric deoxygenation of the sulphoxide. The chemical course of the reaction is consistent with Scheme 31. Since the appearance of the initial results, corrections have been made to the configurations of the phosphorus-containing substrates, and hence the stereochemical details and mechanistic arguments require reappraisal neverthless, the fact remains that (-t-)-sulphoxides are obtained by the use of the ( S)-(-)-acids, R (R O)P(S)OH , a feature which can be used to determine the chirality of other like acids. Dialkyl and alkyl aryl sulphoxides are also known to form diastereoisomeric complexes with (5)-(-)-/er butylphenylphosphinothioic acid, distinguishable by their NMR spectra, and through such complexation it is possible to assess the enantiomeric composition of the sulphoxide " ... 

The following Tables do not constitute a comprehensive list of all of the known derivatives of acetals of ketoses. In order to keep the Tables within manageable proportions, only the more common esters and ethers of the acetals have been included. Halogen-containing compounds and thioethers, and most of the deoxy and anhydro sugars, phosphorus-containing compounds, and esters of inorganic acids have been omitted. Some of these compounds may be found in the Tables of Barry and Honeyman. ... 

A new divergent synthesis of tribranched phosphorus-containing dendrimers and their metal-containing counterparts was recently proposed [7]. It is based on the acid-base hydrolysis of aminosilanes with derivatives containing OH groups. The preparation involved the reaction of a bifunctionalized silane such... 

FOP fraction is composed of compounds such as nucleic acids, phospholipids, inositol phosphates, phosphoamides, phosphoproteins, sugar phosphates, aminophosphonic acids, phosphorus-containing pesticides, and organic condensed phosphates. 

Group 14 Metals - Tin and Lead 173 Phosphates and derivatives of other phosphorus-containing acids... 

Davy thought the experiments described in the fourth Bakerian Lecture showed that ammonia, sulphur, phosphorus and carbon all contain oxygen, and the last three hydrogen. He then described further experiments on sulphur, phosphorus, muriatic acid, and on the substance produced during the passage of sulphur over ignited charcoal (carbon disulphide) without perceiving its composition. 

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