- METHOD FOR THE ESTERIFICATION OF P-O COMPONENTS
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The present invention is directed to a new method for esterification of P-O components. More specifically, the present invention relates to a new method for esterification of P-O components containing at least one P-O-H functional group, whereby the P-O-H functional group(s) is converted into P-O-R functional group(s). The method according tothe invention may find particular use in the manufacture of diesters of phosphorous acid.
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Paragraph 0038-0042
(2013/04/25)
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- Catalytic vapour-phase hydrolysis and photocatalytic oxidation of dimethyl methylphosphonate on a TiO2 surface
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The products of dimethyl methylphosphonate (DMMP) hydrolysis and photocatalytic oxidation on TiO2 were identified and quantified by a FTIR technique at different relative air humidities and concentrations of DMMP.
- Trubitsyn, Dmitry A.,Vorontsov, Alexander V.
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p. 197 - 199
(2007/10/03)
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- Oxidation in organophosphorus chemistry: Potassium peroxymonosulphate
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Potassium peroxymonosulphate (Oxone) is used as an efficient, chemoselective and stereoselective oxidizing agent for a wide variety of phosphorous, phosphothio- and phosphoseleno-compounds.
- Wozniak, Lucyna A.,Stec, Wojciech J.
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p. 2637 - 2640
(2007/10/03)
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- A FACILE SYNTHESIS OF TRIALKYLSILYLPHOSPHITES AND PHOSPHATES
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Trialkylsilylphosphites (1a-1d) and trialkylsilylphosphates (2a-2d) were synthesized in good yield by a facile method.The method could be easily used to prepare P-O-Si bond and P-Si bond compounds from dialkylphosphites and trialkylchlorosilanes.Key words: Phosphates; trialkylsilylphosphites; trialkylchlorosilanes.
- Li, Zhonghua,Zhu, Chuanfang,Zhao, Yongzhen
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p. 229 - 232
(2007/10/02)
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- 2-azabicyclo(2.2.1)hept-5-ene-2-acetic acid, derivatives thereof and related compounds, process for the preparation of said compounds and the use of said compounds for the manufacture of N-phosphonomethylglycine
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The present invention describes a novel compound, 2-azabicyclo[2.2.1]hept-5-ene-2-acetic acid, its preparation and the preparation of related compounds, and the use of said compounds as intermediates for the preparation of N-phosphonomethylglycine.
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- DISPLACEMENT RATE OF ARYLOXY SUBSTITUENTS IN CYCLIC AND ACYCLIC TRIPHOSPHITES BY METHOXIDE IONS, AND WATER
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The displacement rate of aryloxy substituents by methoxide ions in the following triphosphites: 2-phenoxy-1,3,2-dioxaphospholane (I), 2-methoxy-benz-1,3,2-dioxaphospholene (II), and dimethyl phenylphosphite (III), is for each phosphite higher in methanol than in dichloromethane.On the other hand, dichloromethane discriminates much more strongly between five-membered cyclic and acyclic phosphites than methanol, as shown by the following rate ratios cyclic/acyclic in CH3OH: I/III = 13, II/III = 2; and in CH2Cl2: I/III = 1.8 x 103, II/III = 1.1 x 103. Water, as nucleophile towards the same phosphites in deuteroacetone, appears to exhibit somewhat similar magnitude of discrimination as methoxide in methanol. Key Words: Cyclic and acyclic triphosphites; displacement rate of aryloxy substituents.
- Aksnes, Gunnar,Froeyen, Paul
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- 2-azabicyclo[2.2.1.]hept-5-ene-2-acetic acid, derivatives thereof and related compounds, process for the preparation of said compounds, and the use of said compounds for the manufacture of N-phosphonomethylglycine
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The present invention describes a novel compound, 2-azabicyclo[2.2.1]hept-5-ene-2-acetic acid, its preparation and the preparation of related compounds and the use of said compounds as intermediates for the preparation of N-phosphonomethylglycine.
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- ORGANOPHOSPHORUS CHEMISTRY. 2. THE REDUCTION OF QUINQUEVALENT PHOSPHORUS TO THE TRIVALENT STATE
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Phosphoryl and phosphonyl chlorides are reduced conveniently to the monobasic acid forms of the corresponding phosphorous and phosphonous acids by the use of sodium borohydride dispersed in dioxane.
- Engel, Robert,Chakraborty, Subir
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p. 665 - 670
(2007/10/02)
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- Process for the preparation of N-phosphonomethyl-glycine
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N-phosphonomethylglycine is prepared from glycine and parsformaldehyde to obtain an intermediate which is reacted with dialkylphosphite to obtain an ester of the desired compound which is then hydrolyzed.
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- Process for the preparation of N,N-bis-(2-hydroxyalkyl)-aminomethane phosphonic acid dimethyl ester
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The invention relates to a process for the preparation of N,N-bis-(2-hydroxyalkyl)-aminomethane phosphonic acid dimethyl esters corresponding to the following general formula: STR1 wherein each R, may be the same or different and represents hydrogen or, preferably, a lower, linear or branched alkyl radical or halogen-substituted alkyl radical containing from 1 to 6 carbon atoms.
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- Process for the manufacture of aromatic phosphonates
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A process for the manufacture of aromatic phosphorus derivatives of the formula: where R is an optionally substituted alkyl, alkenyl, aralkyl, cycloalkyl or aryl radical, and Ar is an aromatic radical linked to the phosphorus atom through a carbon atom of the aromatic radical which comprises contacting a phosphorous acid diester of the formula: with an aromatic halide of the formula Ar--X in the presence of copper or a copper compound, the symbols R and Ar having the meanings stated above and X representing a halogen atom. The aromatic radical preferably contains an atom or group activating the halogen atom. The process provides an improved method for manufacture of the phosphonic acid diesters.
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