Matches 101 - 150 out of 255 < 1 2 3 4 5 6 >


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4390724 Process for the preparation of 3-formyl-4-R2 R3 -but-3-ene-1-oic acids  
Novel 3-formyl-4-methyl-pentanoic acid derivatives of the formula ##STR1## wherein Y is an aromatic group, R2 and R3 are individually alkyl of 1 to 4 carbon atoms or taken together with the carbon...
4390702 3-Substituted-3-fluoropyruvic acids and their esters and salts, and production thereof  
A 3-substituted-3-fluoropyruvic acid and its ester and salt of the formula: ##STR1## wherein R is a lower alkyl group, a lower alkanoyl group, a fluorinated lower alkanoyl group, a substituted or...
4382037 3-Formyl-4-methyl-pentanoic acids  
Novel 3-formyl-4-methyl-pentanoic acid derivatives of the formula ##STR1## wherein Y is an aromatic group, R2 and R3 are individually alkyl of 1 to 4 carbon atoms or taken together with the carbon...
4377709 Process for the manufacture of 5-oxoalkanoic acids  
5-Oxoalkanoic acids are prepared by addition of a ketone containing at least one hydrogen atom in the α-position with regard to the keto group, to an α,β-unsaturated acid. As catalysts secondary...
4366076 Corrosion inhibited compositions  
Corrosion-inhibited compositions are described comprising a functional fluid in contact with a ferrous metal and, as corrosion inhibitor, a compound having the formula: ##STR1## wherein X is H, an...
4357282 Preparation of fluorocarbonyl compounds  
Fluorinated carbonyl compounds are prepared by contacting a fluorinated methyl or ethyl ether containing at least one methoxylated carbon atom-containing group selected from: --CF2 OR3, CFOR3,...
4342694 Processes for producing pyrethroid insecticide intermediates  
Processes for producing a (1α, 4α, 5α)-6,6-dimethyl-4-halo-substituted-methyl-3-oxabicyclo[3.1. 0]hexan- 2-one and its novel intermediates from known and inexpensive starting materials are...
4340748 Process for the manufacture of glyoxylic acid esters  
The invention relates to a process for the manufacture of glyoxylic acid esters by catalytic dehydrogenation of glycolic acid esters in the gaseous phase.
4334094 Method of preparing aliphatic carboxylic acids  
This invention pertains to the production of higher homologues of aliphatic carboxylic acids by reaction of said acids with carbon monoxide and hydrogen in the presence of one or more...
4334087 Process for preparing α-ketocarboxylic acids  
A novel process for the manufacture of α-ketocarboxylic acids which comprises the reaction of oximinohalide with cyanide ion to form oximinonitrile which is reacted with hydroxide ion to form...
4323702 Process for recovering a carboxylic acid  
A process for recovering carboxylic acids with a material of which the main component is a polymeric compound having a pyridine skeletal structure and a crosslinked structure, followed by...
4302402 Process for the preparation of oximinonitriles  
A novel process for the manufacture of oximinonitriles which comprises the reaction of an oximinohalide with cyanide ion.
4267362 Process for the preparation of delta keto-acids and derivatives thereof  
A process is described for the preparation of delta keto-acids wherein there is used as a catalyst the condensation adduct of a cyclic secondary amine with an α-β-acrylic-type unsaturated...
4247716 Process for producing pyruvic acid  
A novel process for producing pyruvic acid is provided in which process hydroxyacetone is oxidized with a molecular oxygen-containing gas in a water-containing or aqueous solvent in the presence...
4242525 Process for producing salts of pyruvic acid  
A salt of pyruvic acid is formed by oxidizing a salt of lactic acid with an oxygen-containing gas in a water-containing solvent in the presence of a catalyst. The catalyst used herein comprises...
4236021 Process for the manufacture of levulinic acid and esters  
An improved process for the manufacture of levulinic acid which comprises esterification of furfuryl alcohol in the presence of a different alcohol selected from unsubstituted primary and...
4234739 Method for preparing glyoxylic acids and derivatives thereof  
Glyoxylic acids or derivatives thereof are prepared by reacting an acyl nitrile compound with concentrated sulfuric acid in the presence of halide anion to form a first reaction product and then...
4232168 Preparation of ascorbic acid intermediates  
A synthetic route to ascorbic acid is provided in which a 3,5:4,6-protected derivative of gulonic acid is prepared from gulono-1,4-lactone. Oxidation of the derivative and hydrolysis of the...
4229590 Preparation of alkyl pyruvates  
Alkyl pyruvates are prepared by oxidizing alkyl lactates in the presence of a silver catalyst of a defined particle size, at from 450° to 700° C. The products are starting materials for the...
4217290 Process for preparing bifunctional aliphatic organic compounds  
This invention consists of a process for preparing bifunctional aliphatic organic compounds of at least 6 carbon atoms, wherein a cycloaliphatic oxyhydroperoxide is reacted with an alpha-olefine...
4212988 Preparation of 2-ketogulonic acid  
2,5-Diketogluconic acid, alkyl esters or salts thereof, are reduced by an amine-borane to 2-ketogulonic acid, an intermediate for the preparation of ascorbic acid.
4174352 Process for aqueous chromate ion oxidation of allylic halides and halomethylated aromatics to allylic and aromatic aldehydes  
A process for preparing an allylic or an aromatic aldehyde, such as acrolein or benzaldehyde, the process comprising contacting in a basic, liquid, biphasic mixture and at reactive conditions an...
4136111 Process for the production of pyruvic acid  
An improved process for forming pyruvic acid comprising reacting a salt of bitartrate, e.g. potassium bitartrate, with concentrated sulfuric acid at an elevated temperature to produce pyruvic...
4124608 Preparation of 2-oxoalkanoic acids  
2-oxoalkanoic acids are prepared by contacting an alpha-nitroketone with an alkanoic acid anhydride, such as acetic anhydride, and a tertiary amine, such as pyridine, thereby forming a...
4113767 Process for the preparation of alkali metal salts of 3,3-dimethyl-2-oxo-butyric acid  
6-Tert.-butyl-3-mercapto-4-amino-1,2,4-triazin-5(4H)-one is prepared by reacting pinacolone with a sulfur chloride at 0° to 80° C, optionally reacting the mixture with an aqueous amine solution,...
4111959 15,16-Dioxy prostenoic acids and esters and intermediates in their preparation  
This disclosure describes novel 15,16-dioxy prostenoic acids and esters useful as bronchodilators, anti-inflammatory agents, hypotensives and gastric acid secretion inhibitors.
4085127 Method for producing aldehyde acids by selective ozonization of cyclo-olefins  
A mixture containing cyclo-olefin in concentrations of from 10 to 40% is jected to a selective ozonation step to produce a heavy phase containing a mono-ozonide of the cyclo-olefin. The heavy...
4082788 Esterification and extraction process  
Organic acids contained in aqueous solution are separated and/or recovered by a process comprising adding an alcohol to the aqueous solution to esterify the acids present, while preferably...
4076745 Process for calcium salts α-ketocarboxylic acids  
A process for the preparation of calcium salts of α-ketocarboxylic acids comprising reacting an α-ketocarboxylic acid with an amine, to afford a salt, said salt being soluble in the reaction...
4043937 Halogen derivatives of ascorbic acid and D-araboascorbic acid antioxidants  
The halogen derivatives of ascorbic acid and D-araboascorbic acid useful as antioxidants as well as a method for stabilizing oxidation-sensitive organic materials by incorporating said derivatives...
4026929 Selective extraction of glyoxylic acid from aqueous mixture with glyoxal  
Glyoxylic acid is selectively extracted from its aqueous mixture with glyoxal by means of aliphatic or cycloaliphatic alcohol containing about 4 to 8 carbon atoms, a ketone containing about 4 to 8...
4000200 Preparation of ketones from olefins  
Olefins oxidized with organic hydroperoxides in the presence of water and the appropriate metal catalyst at temperatures in the range of 140° to 250° C. give high yields of the corresponding...
3998878 Selectively separating oxalic, tartaric, glyoxylic and erythronic acids from aqueous solutions containing the same  
Mixtures of oxalic, meso tartaric, glyoxylic and erythronic acids derived particularly from the oxidation of cellulose derivatives are separated from aqueous solutions in which they are contained...
3997599 Extraction of carboxylic acids from dilute aqueous solutions  
Mono or dicarboxylic acids containing from two to four carbon atoms are extracted from dilute aqueous solutions with an organic liquid comprising one or more of the following extractants: dialkyl...
3984341 Iodophors and a process for their preparation  
A non-foaming iodophor having a high content of active iodine comprises the product formed by mixing while heating at about 50°-120°C for about 0.75-15 hours a reaction mixture of: I. about 10-30...
3980695 Methyl-pentenyl sulphones  
Sulphones of formula QSO2 CH2 CY=CY1 CH2 CHRR1 wherein one of Y and Y1 is hydrogen the other methyl, R and R1 are CHO, COR2, COOH, COOR3, CONR5 R5, CN, SO2 R4, SO3 R5 and NO2, wherein R2 -R5 are...
3965168 3-Carbamoyl-3-hydroxyglutaric acid and salts  
It is disclosed that citric acid or its salts are obtained by the hydrolysis of a 3-carbamoyl-3-hydroxy-4-cyanobutyric acid or salt, that a 3-carbamoyl-3-hydroxy-4-cyanobutyric acid or salt is...
3960941 3-Hydroxy-3,4-dicarbamoylbutyric acid and salts  
It is disclosed that citric acid or its salts are obtained by the hydrolysis of a 3-carbamoyl-3-hydroxy-4-cyanobutyric acid or salt, that a 3-carbamoyl-3-hydroxy-4-cyanobutyric acid or salt is...
3952033 Furan intermediates and process for synthesis of 4-hydroxycyclopetenones, prostaglandin synthesis intermediates  
This disclosure describes novel 2,5-dihydro-2,5-dialkoxyfuran derivatives useful as intermediates for the preparation of the natural prostaglandins and their congeners.
3950412 Method for the production of haloacetoacetic acids  
Haloacetoacetic acids of the formula R1 CH2 --CO--CR2 R3 --COOHwherein R1 represents chlorine or bromine and R2 and R3 each represents hydrogen, chlorine or bromine, are obtained by converting...
3946082 Preparation of zerovalent phosphine substituted rhodium compounds and their use in the selective carbonylation of olefins  
A process for preparing oxygenated products comprising aldehydes, which have high normal to branched-chain isomer ratios. The process involves using particularly characterized rhodium-containing...
3931331 Process of preparing α-formyl sulfides and 2-hydrocarbylthioaldoximes therefrom  
An α-formyl sulfide is prepared by a process which comprises reacting in an aqueous medium an α-haloaldehyde of the formula ##EQU1## wherein R' and R" independently are hydrogen, hydrocarbon...
3917661 Hydroformylation of unsaturated organic compounds  
An Oxo process using unsaturated organic reactants such as alkyl alkenoates to prepare oxygenated products comprising aldehydes which have unusually high normal to branched-chain isomer ratios....
3897467 Process for the preparation of α-ketocarboxylic acids  
A process for the preparation of α-keto-carboxylic acids for the formula: R-CO-COOH in which R represents an aliphatic, aromatic, aralkyl, alicyclic or heterocyclic radical which may or may not be...
3872166 IMPROVEMENT IN THE RECOVERY OF GLYOXYLIC ACID  
A process for the recovery of glyoxylic acid as a byproduct in the synthesis of glyoxal by elution of the ion exchanger used for purifying the glyoxal and crystallization of sodium glyoxylate at a...
3862220 METHOD OF PREPARING HALOGENATED OLEFINIC DERIVATIVES OF SATURATED GAMMA-KETO MONO-CARBOXY ACIDS AND RELATED COMPOUNDS  
Direct halogenation of C4 -C10 saturated keto monocarboxy acids or their acidogenic derivatives with elemental halogen to yield olefinic halogenated compounds (e.g., acids and lactones) containing...
3862150 DELAYED POLYURETHANE ACTION CATALYSTS  
Novel salts of tertiary amines and alpha-substituted carboxylic acids have advantages as delayed action thermally activated catalysts such as in urethane and epoxy catalysis. Some salts of...
3856833 METHOD FOR THE PRODUCTION OF ALDEHYDIC ACIDS  
A method is disclosed which permits obtaining bifunctional chemical compounds, such as acidic aldehydes from ozonides of olefins, the improvement consisting in that the peroxidic derivatives of...
3852307 SYNTHESIS OF ZEARALANONE AND RELATED COMPOUNDS  
This invention provides a new synthesis for zearalanone and for related compounds having more or fewer carbon atoms in the non-aromatic ring than does zearalanone, which related compounds and...
3847978 PERFLUORINATED LINEAR POLYETHERS HAVING REACTIVE TERMINAL GROUPS AT BOTH ENDS OF THE CHAIN AND PROCESS FOR THE PREPARATION THEREOF  

Matches 101 - 150 out of 255 < 1 2 3 4 5 6 >