Matches 51 - 100 out of 255 < 1 2 3 4 5 6 >


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5677423 Process for performing retro-aldol reaction  
A process for removing β-hydroxy groups from β-hydroxy-containing compounds is disclosed. The process involves the use of a retro-aldol-promoting reagent selected from the group of...
5627288 Method for producing rosefuran precursor and intermediates therefor  
Disclosed are 3,7-dimethyl-4-oxo-7-octenoic acid and its alkyl esters which are intermediates for producing a fragrance, rosefuran and which are represented by: ##STR1## where R is H or a lower...
5610314 Process for preparing dioxolenone derivatives used for making prodrug esters and intermediates  
A process is provided for preparing dioxolenone derivatives of the structure ##STR1## wherein R is alkyl or aryl and R3 is CO2 R2 (where R2 is alkyl or arylalkyl such as benzyl, diphenylmethyl or...
5602280 Process for production of unsaturated aldehyde and unsaturated carboxylic acid  
Disclosed are a process for producing an unsaturated aldehyde and an unsaturated carboxylic acid which comprises subjecting propylene, isobutylene or tertiary butanol to gas phase catalytic...
5554790 Process for producing acetic anhydride and acetic acid  
In a process for producing acetic anhydride and acetic acid by reacting methanol and methyl acetate, optionally together with dimethyl ether, with carbon monoxide, acetic anhydride and acetic acid...
5449823 Compounds and process for making a flavorant  
Two optically active forms of 4-hydroxy-3-methyl-2-keto-pentanoic acid of the formula ##STR1## wherein carbon atom 4 has the (S)-configuration, and carbon atom 3 can have the (R)-configuration or...
5449821 Multimetal oxide compositions for gas-phase catalytic oxidation  
A process for the gas phase catalytic oxidation of a C3-6 alkane, alkanol, alkene or alkenal using as a catalyst multimetal oxide compositions of the formula I, [X1a X2b Ox ]p [X3c X4d X5e X6f X7g...
5395965 Catalyst for the production of a glyoxylic acid by catalytic oxidation of glyoxal and method of its production  
A catalyst containing platinum on carbon as carrier for the catalytic oxidation of glyoxal to glyoxalic acid. Activity and selectivity of the catalyst can be considerably improved by modification...
5393924 Method for the preparation of arylalkanolamineacylates  
Acylamides or amine acylate salts of arylalkanolamines are prepared by reacting an arylisonitrosoalkanone with hydrogen and a carboxylic acid, carboxylic acid anhydride or carboxylic acid ester or...
5286893 Alkenoic acid compounds for mechanism-based inactivation of dehydropeptidase activity  
Alkenoic acid compounds are described. The compounds which are dehydropeptidase inactivators contain a ##STR1## moiety which is substituted with a halomethylene or a cyano moiety as R3. The enzyme...
5276180 Process for making succinyl acetone  
The present invention is a simplified process for making succinyl acetone (SA). The most preferred embodiment is a one step process that reacts levulinic acid, ethyl acetate, and a base to form...
5202476 Purification of 2-keto-L-gulonic acid  
According to the present invention which comprises subjecting an aqueous solution of 2-keto-L-gulonic acid or its water-soluble salt containing an acid impurity, whose acidity is higher than that...
5189215 Process for the preparation of storage-stable levulinic acid  
A process for the preparation of color-stable levulinic acid by saponification of acetylsuccinates with aqueous mineral acids, by continuously treating the starting products with steam in...
5175358 Preparation of laevulinic acid  
Essentially pure and colorless laevulinic acid is produced by heating and ring-opening furfuryl alcohol in the presence of water and a strong non-oxidizing protonic acid, and which includes...
5169862 Analogs of viscosin and their uses  
This invention is directed to the analogs of viscosin, pharmaceutical compositions thereof and to their use as antibacterial, antiviral and antitrypanosomal therapeutic compounds.
5162552 Preparation of 4-acetals of butene-1,4-dial and novel acetals of butene-1,4-dial  
A process for the preparation of 4-acetals of butene-1,4-dial of the formula ##STR1## where R is an alkyl, alkenyl, cycloalkyl or aralkyl radical of 1 to 12 carbon atoms which may contain alkoxy...
5138096 New continuous industrial manufacturing process for an aqueous solution of glyoxylic acid  
Continuous manufacturing process for an aqueous solution of glyoxylic acid by nitric oxidation of an aqueous solution of glyoxal carried out in the presence of hydrochloric acid in which the...
5091568 Oxygen-ruthenium oxide oxidation of 2-hydroxy-3,3-dimethyl-butanoic acid  
In the oxidation of 2-hydroxy-3,3-dimethyl-butanoic acid in solution in the presence of a ruthenium oxide catalyst to produce 2-oxo-3,3-dimethyl-butanoic acid, the improvement wherein oxidation is...
5091566 Process for the manufacture of aqueous solutions of glyoxylic acid  
The invention relates to the preparation of glyoxylic acid by oxidizing an aqueous solution of glyoxal having a pH less than 1 with molecular oxygen in the presence of nitrogen monoxide as a...
5068417 Process for the continuous preparation of glyoxylic acid  
A process for continuous preparation of a concentrated aqueous solution of glyoxylic acid by hydrolysis of glyoxylic acid ester hemiacetals, wherein glyoxylic acid ester hemiacetals are treated...
5053527 Process for the manufacture of alkyl pyruvates  
The invention provides an improved process for the manufacture of alkyl pyruvates having general formula (I): CH3 --CO--COOR (I)where R represents a C1 to C8 alkyl radical, by controlled oxidation...
4973747 Process for preparing 3-hydroxy 2-keto acids  
A process has now been discovered by which an intermediate in preparation of antibiotics ##STR1## may be directly derived from the substrate ##STR2## by treatment with aqueous solutions of MHCO3...
4950429 Preparation of 6-aminocaproic acid  
6-Aminocaproic acid is prepared by (a) reacting a 5-formylvaleric acid ester with water in the presence of an acid agent at 30°-200° C. and (b) reacting the 5-formylvaleric acid thus obtained with...
4902828 Recovery of aqueous glyoxylic acid solutions  
Aqueous glyoxylic acid solutions, essentially free of other acids, are recovered from aqueous solutions which still contain other acids, by a method in which the aqueous solution is mixed with an...
4898974 Production of 3,3-dimethyl-2-oxo-butyric acid salt  
Dichloropinacolone is produced by introducing into pinacolone twice the molar amount of chlorine, the exothermic reaction mass being cooled initially to maintain the temperature below about 50° C....
4867849 Purification of alkyl glyoxylate  
There is disclosed an improved process for the manufacture of glyoxylic acid obtained by oxidation of glycolic acid. For processing purposes alkyl esters of these acids are employed. Increased...
4827004 Isoprene derivatives  
Novel Isoprene Derivatives which have mucosa-protective and gastric acid secretion-inhibiting properties and are useful for combatting ulcers both by treating and as a prophylaxis against gastric...
4738802 Process for preparing alkyl α-keto-carboxylic acids from alkyl halides  
A process for the production of an alkyl α-keto-carboxylic acid of the general formula: ##STR1## wherein: R is a linear or branched alkyl radical having from 1 to about 20 carbon atoms which...
4649217 Process for producing oxocarboxylic acids  
Oxocarboxylic acids, for example adipaldehydic acid can be advantageously produced by a process, in which cyclohexanones are oxidized with molecular oxygen in the presence of water and iron or...
4647413 Perfluoropolyether oligomers and polymers  
Perfluoropolyether oligomers or block polymers, having a backbone with one or a plurality of perfluoropolyether segments each consisting essentially of (1) at least one perfluoroisopropyleneoxy...
4643994 Novel organic trithio oxides and method for the preparation thereof  
This invention relates to novel organic trithio oxides of the formula: R1 --X --R--X1 --R1wherein R is selected from --CH2 CHCH--, ##STR1## and (CH2)3 ; X is selected from ##STR2## X1 is selected...
4628117 Process for the ozonization of α,β-unsaturated cyclohexanones to 5-ketoalkanoic acids  
An improved process for the ozonization of α,β-unsaturated cyclohexanones, most notably isophorone and piperatone, to produce 5-ketoalkanoic acids is provided. For the process, the α,β-unsaturated...
4628118 5,5-dichloro-3,3-dimethylpentanoic acid  
The following process steps are shown: ##STR1## Intermediates I, II and IV are new. End product III is known, useful as an intermediate in the manufacture of pesticides, pharmaceuticals and dyestuffs.
4620034 Process for the preparation of 2-keto-aldonic acids  
Preparation of 2-keto-aldonic acids, e.g., 2-keto-gluconic acid, by oxidizing an aldose, e.g. glucose, or aldonic acid in aqueous solution with molecular oxygen. Use is made of a platinum catalyst...
4614822 Catalytic oxidation of 3,3-dimethyl-2-hydroxybutyric acid to 2-oxo acid and preparation of 4-amino-6-tert.-butyl-3-thio-1,2,4-triazine-5(4-H)-one  
Sodium 3,3-dimethyl-2-hydroxybutyrate and ruthenium dioxide hydrate are added to water, the pH rendered alkaline, and sodium hypochlorite is slowly added to produce sodium...
4614816 Preparation of carboxylic acids and esters thereof  
A carboxylic acid or an ester thereof having at least two carbon atoms more than formic acid is prepared by reacting at elevated temperature e.g. 100° to 250° C. formic acid or a formate ester...
4612391 Preparation of oxycarboxylic acids  
This invention provides a process for the conversion of an alicyclic α,β-olefinically unsaturated ketone compound to an acyclic oxocarboxylic acid product which contains at least one less carbon...
4599446 Process for the preparation of 2-keto-L-gulonic acid  
A process for the preparation of 2-keto-L-gulonic acid by the oxidation of L-sorbose with an oxygen-containing gas in water used as the solvent, wherein the reaction is carried out in the presence...
4567004 Process for the preparation of monomethyl-substituted methylene compounds  
Monomethyl-substituted methylene compounds are obtained by reacting methylene compounds of the formula ##STR1## in which R1 and R2 independently of one another represent --CN, --CO--R3, --SO2 --R3...
4558153 Preparation of carboxylic acids and esters  
Carboxylic acids having two or more carbon atoms than formic acid, or esters of such carboxylic acids are prepared by reacting either formic acid or an ester of formic acid with an olefin at...
4556732 Pentenoic acid and its preparation  
Novel 3-formyl-4-methyl-pent-3-ene-1-oic acid of the formula ##STR1## and a process for its preparation and intermediates and a process for the preparation of compounds of the formula ##STR2##...
4529704 Device and method for preparation of a control solution for ketone determination.  
A device for preparing a control solution for ketone analysis is disclosed, as well as a method for preparing it. The device comprises a carrier vehicle incorporated with an ester of a...
4511734 Process for the production of 3,3-dimethylglutaric  
Process for the production of 3,3-dimethylglutaric acid from isophorone. In a first step the isophorone is converted with ozone into an ozone-addition product. The ozone-addition product is...
4503246 Process for preparation of glyoxylic acid  
A process for the preparation of glyoxylic acid is disclosed which comprises reacting an aqueous solution of glyoxal with chlorine. The reaction is preferably carried out under pressure, under the...
4500720 Tetrahydrofuran-2-ones  
Novel 3-formyl-4-methyl-pent-3-ene-1-oic acid of the formula ##STR1## and a process for its preparation and intermediates and a process for the preparation of compounds of the formula ##STR2##...
4487972 Production of oxygenated compounds  
This specification discloses a process for the production of oxygenated compounds, more specifically aldehydes and alcohols, by reacting an olefin with hydrogen and carbon monoxide in the presence...
4487957 Process for the preparation of alkyl 4-methyl-3-formyl-penten-1-oates  
A novel alkyl 4-methyl-3-formyl-penten-1-oate of the formula ##STR1## wherein R is alkyl of 1 to 5 carbon atoms and the dotted lines represent a double bond in the 3,4 or 4,5-position and their...
4442303 Recovery of water miscible organic acids from aqueous solution as alkyl esters  
In one of its embodiments this invention provides a process for recovering C4 -C6 dicarboxylic acid components contained in a waste byproduct stream derived from a reaction system in which adipic...
4440740 α-Keto aldehydes as enhancing agents of gastro-intestinal drug absorption  
A method and drug form enhancing the absorption of a rectally or orally administered drug from the rectal compartment into the blood stream of a warm blooded animal. The method includes the steps...
4414418 Process for the production of dimedone  
Process for the production of dimedone from isophorone. The isophorone is converted in the presence of a solvent with ozone into an ozone-addition product. An alcohol corresponding to the ester...

Matches 51 - 100 out of 255 < 1 2 3 4 5 6 >