Methylphosphoric acid

JMethylphosphonc Acid—Cyanamide System. In another system (65), based on methylphosphoric acid [993-13-5] (MPA) and cyanamide [420-04-2] one or more of the hydroxyls in MPA or in its dimer react with cellulose and the water is taken up by the cyanamide, forming urea ... 

It was stated that the wavelengths of the absorption bands of elements are higher than those of their compounds, and that the bands pass to shorter wavelengths as the valency rises, provided that the successively attached atoms or radicals are the same. The general results showed that the structural formulae of the phosphorous diesters, triphenyl-methylphosphorous acid and ferric monopropyl phosphite were (RO)2 =PO — (H), sodium diethyl phosphite (EtO)2PO(Na), silver diethyl phosphite (EtO)2P(OAg), monoacetylphosphorous acid (HO)2 PO(Ac). In solution, the diesters and metal esters contained a mixture of tautomeric forms.3... 

Olefins, synthesis -Butyllithium. 1,3-Dibenzyl-2-methyl-l, 3,2-diazaphospholidine. Dimethyl methylphosphonothioate. Diphenylsulfonium isopropylide. N-Methanesulfinyl-p-toluidine. Methylphosphoric acid bis(dimethylamide). Phosphoryl chloride-Stannous chloride-Pyridine. p- Toluenesulfonylhydrazine. Triphenyl phosphite. 

Methylphosphoric acid /2-Butylphosphoric acid Glucose-1-phosphate Dimethylphosphoric acid Di-/i-butylphosphoric acid... 

Linear polymers (99) with much less branching were also prepared by polyaddition of diepoxides (96) to disilyl esters of methylphosphoric acid (95b), because the addition of the phosphoryl fragment to the epoxide ring is connected with the simultaneous blocking of the hydroxy groups by the trimethylsilyl moieties. " " " ... 

Potassium hydroxide, 258 Trimethylsilyl chlorochromate, 327 of carbon-carbon double bonds substituted by heteroatoms m-Chloroperbenzoic acid, 76 of oximes to carbonyl compounds Lithium aluminum hydride-Hexa-methylphosphoric triamide, 159 Titanium(III) chloride-Diisobutylalu-minum hydride, 303 Trimethylsilyl chlorochromate, 327 of protected alcohols Chlorodimethylthexylsilane, 74 Formic acid, 137 p-Methoxyphenol, 181 of thioacetals and -ketals Methoxy(phenylthio)trimethyl-silylmethane, 182... 

Lithium aluminum hydride-Hexa-methylphosphoric triamide, 159 Methoxyamine, 177 Titanium(III) chloride-Diisobutyl-aluminum hydride, 303 Trimethylsilyl chlorochromate, 327 From vinylsilanes m-Chloroperbenzoic acid, 76 Miscellaneous methods to prepare ketones... 

Although phosphoric acid has three hydroxy groups that can be used to form derivatives, the various reactions involved are again similar to those of carboxylic acids. For example, the reaction of phosphorus oxychloride, which can be viewed as a tri(acid chloride) of phosphoric acid, with excess dimethyl amine produces a triamide, hexa-methylphosphoric triamide ... 

Examination of Solvent Effect on Nucleophilic Fluorination with KF/ dicvclohexano-18 crown-6. Using 1-bromodocosane (12) as substrate and KF/DC-18-C-6 as reagent system, solvent effect was examined. Solvents were chosen from common dipolar aprotic solvent [acetonitrile, hexa-methylphosphoric triamide (HMPT), dimethylsulfoxide (DMSO), diglyme], from weakly basic dipolar aprot c solvents (sulfolane, ethylene carbonate, propylene carbonate) " and from acid amide solvents [N,N-dimethylformamide (DMF), N,N-diethylacetamide (DEA), N-methyl-pyrrolidone (NMP), tetramethylurea]. ... 

Aryloxysulfonylalkyllithiums can be converted to ketones in one pot by reaction with oxodiperoxymolybdenum(pyridine)(hexa-methylphosphoric triamide), his(trimethylsilyl) peroxide, or chlorodimethoxyborane/m-chloroperbenzoic acid. ... 

Variant a) represents the reaction of metallated p-picoline with a 2,4-di-chlorobenzoic acid ester. This pathway appears attractive because of its shortness and the cheapness of the starting pyridine building block. Formation of the lithiiun salt of p-picoline requires e.g. lithiumdiisopropylamide and 1-2 equivalents of hexa-methylphosphoric triamide. This anion reacts e.g. with benzoic acid methylester to give the unsubstituted ketone in 90% yield as reported by Kaiser and Petty (. ... 

A silicon-silicon bond of hexamethyldisilane (159) is cleaved by BU4NF in hexa-methylphosphoric triamide (HMPA) to produce a naked silyl anion and fluorotri-methylsilane [58]. The resulting silyl anion undergoes aldehyde addition to afford, after acidic workup, 1-trimethylsilyl-l-alcohols like 160 (Scheme 5.41). The silyl anion can react with 1,3-dienes to give l,4-bis(trimethylsilyl)-2-butene 161 with high ( )-selectivity. 

---