摘要:
The reaction of amino acids and a haloalkylphosphonic acid to form the corresponding phosphonoalkylated amino acid is promoted by use of a catalytically effective amount of a polyamine catalyst which contains a sufficiently high concentration of amine nitrogen atoms to promote the reaction.
摘要:
Amino acids can be easily prepared by reducing unsaturated hydantoins to the corresponding saturated hydantoins by hydrogenating the unsaturated hydantoin using either Raney Nickel catalyst in the presence of more than a stoichiometric amount of caustic or by using zinc and hydrochloric acid followed by hydrolyzing the resultant composition with at least 3 molar equivalents of an alkali metal hydroxide to produce a racemate of an alpha amino acid. The amino acid in suitable derivative form can then be resolved particularly using a two-phase solvent system. The residual isomer of the amino acid remaining after the resolution process can then be racemized using either pyridoxal-5-phosphate or an aliphatic acid in combination with an aldehyde or a ketone. By these procedures, it is possible to obtain high yields of amino acids.
摘要:
The invention is directed to the one-step hydrogenation/esterification of arylmethyleneoxyaryloxy alkanoic acids to produce (hydroxyphenoxy) carboxylates. The process comprises the hydrogenation and esterification of the aryloxy alkanoic acid in the presence of a palladium hydrogenation catalyst and an acidic esterification catalyst preferably utilizing the alcohol for the esterification as the hydrogenation solvent. The acid serves the dual role of hydrogenation promoter and esterification catalyst.
摘要:
A method of recovering phosphate esters from the by-product residues derived from phosphate ester production is disclosed. The method comprises extracting the phosphate esters from the residue utilizing a hydrocarbon solvent.
摘要:
Tertiary-butylphenyl diphenyl phosphate esters in which the nominal molar ratio of tertiary-butyl radicals to phenyl radicals ranges from about 1:5 to about 1:2, the meta-tertiary-butylphenyl content ranges from about 25% to about 100 % and the ortho-tertiary-butylphenyl content is less than about 50% are highly effective plasticizers for vinyl chloride polymer compositions.
摘要:
A process for producing in high yields a substantially pure dialkyl phosphorochloridothionates. The process comprises chlorinating bis(phosphorothioic) sulfides, thioic acids, or salts thereof, distilling the reaction mixtures, contacting the distillate with a thioic acid or salt thereof, contacting the mixture with water and distilling the organic material after the water contacting.