Thiophosphoric acid O-

Compound (1) phosphorylates phosphate monoesters and alcohols, although with the latter a considerable excess of alcohol is necessary to obtain satisfactory yields. In the absence of mercuric ions the milder phosphorylating species (3) can be isolated which converts monoalkyl phosphates to pyrophosphate diesters in good yield but does not react appreciably with alcohols unless catalytic amounts of boron trifluoride are added. Amine salts of (3) are converted to phosphoramidates on heating. In the presence of silver ions, O-esters of thiophosphoric acid behave as phosphorylating agents and a very mild and convenient procedure suitable for preparing labile unsymmetrical pyrophosphate diesters, such as the... 

Tetramethylhydrazine, see Dimethylamine Tetramethylsuccinonitrile, see Aldicarb Tetrazene, see Naphthalene 2-Thiazolidinethione-4-carboxylic acid, see Captan 1.1 -Thiobis-ethane, see Phorate 3.3 -Thiobis(methylene)-1.2.3-benzotriazin-4(3Afl-one, see Azinnhos-methyl Thiomalic acid, see Malathion Thiomethylbenzazimide, see Azinphos-methyl Thiophene, see Benzene Thiophenol, see Fonofos Thiophosphoric acid, see Phorate Thiram monosulfide, see Thiram o-Tolualdehyde, see oXylene m-Tolualdehyde, see m-Xylene p-Tolualdehyde, see p-Xylene Toluene, see Benzene. 2-ChlorobiDhenyl. 4 Chlorobinhenyl. Isobutylbenzene, Methylcyclohexane, Styrene, p-Xylene... 

Plants. In rice, phenyl maleich ydrazide, O.O-diethyl thiophosphoric acid, and PMH glycoside are formed Soil. DTJ0 11-24 days... 

O-ethyl-S-phenyl thiophosphoric acid, S,S-diphenyl dithiophosphoric acid and... 

Phosphorus Compounds.—Treatment of the dioxaphospholen (635) with sulphur yields a mixture of the oxathiole (636) and fran -dibenzoylstilbene, PhCOCPh=CPhCOPh." 2-Phenyl-l,3,2-dioxaphospholan (637 R = Ph) dimerizes in solution to a ten-membered-ring compound, which was isolated as (638) by sulphurization." The cyclic thiophosphorous acid (639) exists in equilibrium with the betaine (640) in aqueous ethanol/ The spiro-compound (641), which contains a phosphorus-hydrogen bond, is formed by the action of (637 R = Cl) on diethyl tartrate. The phosphazene (642) spontaneously cyclizes to the spiro-compound (643). " Stable derivatives (645) and (646 R = Br) of five-co-ordinate phosphorus have been obtained by the action of bromine on the o-phenylene phosphite (644)/ The chlorine analogue (646 R Cl) reacts with 3,5-dimethylpyrazole to give the corresponding pyrazole derivative (646 R = 3,5-dimethylpyrazol-l-yl), which reversibly dimerizes to the zwitterion (647). ... 

Hydrolysis mechanisms in clay-water systems also can be dependent on the nature of the exchangeable cation. For example, Pusino et al. (1988) studied the catalytic hydrolysis of quinalphos on homoionic bentonite clays. On the Na- and K-clays, deethylation occurred, resulting in the formation of O-ethyl O-quinoxalin-2-yl thiophosphoric acid, whereas 2-hydroxyquinoxaline is the main reaction product on the Cu-, Fe- and Al-clays. 

The alkylation, with the more reactive of alkyl halides, of the sodium salts of monoes-terified phosphonothioic acids (equation 22) (see also Scheme 11) or of the disodium salts 107 results in preferential S-alkylation, and the same situation obtains for the salts of phosphinothioic acid " methylation can also be carried out with dimethyl sulphate. Alkylations may also be performed under phase-transfer conditions. From both practical and theoretical perspectives, the subject is more complex, since the course of alkylation reactions depends on the nature of the alkylating agent, on the polarity of solvent and whether this is protic or non-protic and on the concentrations of reactants a study of these features has been the subject of two reports In non-polar or weakly polar aprotic media, or in EtOH, alkylation occurs almost exclusively on sulphur, but in dipolar aprotic solvents, O-alkylation also takes place. The relative yields of sulphur- and oxygen-substituted derivatives, [Qs/Qol depends, for a given solvent, on the nature of substituents on phosphorus, i.e. essentially, whether the substrate is a thiophosphoric, thiophosphonic or thiophosphinic acid. With alkyl tosylates as alkylating agents at 0.02 m in hmpt, the alkylation of sodium 0,0-dialkyl or diphenyl phosphorothioates results in 100% overall conversions with [Qs/Qo] 5 the overall yields for sodium diphenyl- or diisopropyl-phosphinothioates are lower (50-100%) with [Qs/Qo] 1 ... 

Dialkyl thiophosphites Thiolphosphonic O-monoesters Thionophosphonic acid esters Thiophosphonic acids and esters Thiophosphorous esters... 

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