Matches 101 - 150 out of 248 < 1 2 3 4 5 >
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5426195 Process for the catalytic dehydrogenation of diols  
Diols of 3 to 10 carbon atoms are catalytically dehydrogenated over a catalyst containing copper and chromium in a first stage in which the diols are passed in the liquid phase over the catalyst,...
5416224 Process for converting α-acyl-substituted lactones to α-alkylidene-substituted lactones  
A convenient stereoselective process for the preparation of α-alkylidene-substituted-γ-butyrolactones and δ-valerolactones is provided. The process involves reacting an α-acyl lactone, an...
5405974 Process for producing a lactone or an ester  
A process for producing a lactone or an ester represented by the following general formula (2), wherein R 1 and R 2 , identical or different, each represents (C 1 --C 20 ) alkyl group; alkyl...
5401857 Process for making γ-butyrolactones  
A cyclocarbonylation process for making γ-butyrolactones under mild temperature and pressure conditions is disclosed. In the process, an allylic alcohol reacts with carbon monoxide in the presence...
5376676 Process of using anti-inflammatory furanones as selective calcium channel inhibitors  
4-(C 10 -C 20 )alkyl-2(5H)-furanone compounds are selective calcium channel inhibitors and useful for treatment of diseases such as hypertension, angina, cardiac arrythmia, pulmonary hypertension,...
5374744 Method for manufacturing 4-substituted-Y-lactone and novel substance  
An alkynyl group having a triple bond at the carbon atom at the 1-position is introduced to a carbon atom at the 1-position of 2,3-O-isopropylidene-D-ribofuranose. The diol part is then cleaved to...
5371106 3,4-diaryl-5(H)-furan-2-one based compounds with fungicidal activity  
Compounds based on 3,4-diaryl-(5H)-furan-2-one, with fungicidal activity, having the general formula (I): ##STR1##
5358964 Benzylidene-lactone and their thiocarbonyl analogs as inhibitors of proteoglycan degradation  
The manufacture and use of compounds of the formula ##STR1## wherein Y is O or S, R 1 is hydrogen or alkyl, and R 2 , R 3 , R 4 and R 5 are hydrogen or various substituent groups, and...
5336686 17 Methylene lactones of steroids  
A compound selected from the group consisting of a compound of the formula ##STR1## wherein the substituents are defined as in the application having antiglucocorticoid and antiprogestomimetic...
5322942 Synthesis of optically active lactones from L-aspartic acid and intermediates thereof  
Optically active lactones are described, such as an intermediate lactone having the formula ##STR1## where R and R 2 are each independently alkyl with 1 to 6 carbon atoms, cycloalkyl with 6 to 10...
5319108 Method for producing (R,Z)-5-tetradecen-4-olide  
A method for producing (R,Z)-5-tetradecen-4-olide, comprising the following reaction formulas; ##STR1##
5310944 Process for producing carboxylated compound  
A process for producing a carboxylated compound, which comprises reacting a carbonyl compound with hydrogen peroxide in the presence of an organo-arsenic acid of the formula (1), ##STR1## wherein:...
5288811 Cyclic carbonyl containing compounds via radical grafting  
Accordingly, novel carbonyl containing compositions are prepared by contacting, in the presence of a free radical initiator, a compound selected from the group consisting of saturated hydrocarbons,...
5278321 Process for simultaneously producing lactone and aromatic carboxylic acid  
A process for simultaneously producing a lactone and an aromatic carboxylic acid, which comprises oxidizing a cyclic ketone and an aromatic aldehyde wherein: the cyclic ketone/aromatic aldehyde...
5274128 Octalactone-containing composition, fermentation process for producing same and organoleptic uses thereof  
Described is a process for the preparation of compositions of matter containing octalactones defined according to the structure: ##STR1## which includes the stereoisomers having the structures:...
5231192 Process for the preparation of alpha-alkyl lactones  
Process for the preparation of α-alkyl lactones by the steps of first reacting an α-acyl lactone, an aldehyde, and an alkali metal hydroxide together to form an α-alkylidene lactone, and then...
5216177 Method of preparing trans-3,4-disubstituted-γ-lactones  
First, levoglucosenone is made to react with methyl lithium in the presence of copper iodide in order to introduce a methyl group into an enone group of levoglucosenone, and to obtain...
5210229 Process for the preparation of gamma-butyrolactone  
Gamma-butyrolactone is prepared by catalytic dehydrogenation of 1,4-butanediol in a gaseous phase in the presence of a catalyst comprising copper, chromium, and manganese and/or barium. Improvement...
5189182 Preparation of 5-methylbutyrolactone  
5-Methylbutyrolactone is prepared by a process in which a pentenoic ester of the formula I X--CO 2 R (I), where X is CH 2 CH--CH 2 --CH 2 --,...
5183908 Process for the preparation of substituted furanones  
This invention relates to an improved process for the preparation of 3-acyl-5-alkyldihydro-2(3H)-furanones according to the following reaction scheme: ##STR1## wherein R and R 1 are hydrogen or...
5179077 4-methyl-3-pentyl-2(5H)-furanone  
The invention concerns the novel compound, 4-methyl-3-pentyl-2 (5H)-furanone, I, a process for the manufacture of I and fragrance and flavor compositions containing I. ##STR1##
5175310 Process for producing alkylthio- and arylthio-substituted carboxylic acids and their thioesters  
A process is provided for producing alkylthio-substituted carboxylic acids and arylthio-substituted carboxylic acids and their corresponding alkylthio-substituted thioesters and...
5164499 Nitroaryl carbonyl compounds, nitrodihydroaryl carbonyl intermediates thereto, and processes  
Nitroaryl carbonyl Formula (IIA) compounds, their nitrodihydroaryl carbonyl Formula (I) intermediates, processes for preparing Formula (II) compounds, and a process for preparing Formula (I)...
5136055 Method for production of dicarboxylic acid and lactone  
A 21-carbon aliphatic branched chain dicarboxylic acid and a 21-carbon lactone are produced by reacting fatty acid (which contains linoleic acid) with acrylic acid via iodine catalysis, and...
5130157 Process for concentrating lactones  
The present invention relates to a process for obtaining an aroma concentrate that is enriched in lactones. The present invention is particularly concerned with a process for concentrating lactones...
5128370 Furans and lactones from sterptomycetes and the use thereof  
New furans and lactones from streptomycetes, a process for the preparation thereof, and the use thereof. It is possible with the aid of various streptomycetes species to prepared new compounds...
5114493 Smoking compositions containing a hexahydrobenzofuranone flavorant  
This invention provides smoking compositions which contains a 6-substituted hexahydrobenzofuranone flavorant additive. Under cigarette smoking conditions the flavorant additive enhances the aroma...
5110954 Dehydrogenation of diols  
A process is provided for the production of lactones by the catalytic dehydrogenation of aliphatic diols containing from 3-7 carbon atoms and optionally one or more ether linkages in the diol...
5106995 Production of lactones from diols  
A method for converting 1,4 and 1,5 aliphatic saturated diols to lactones is disclosed wherein the diol is reacted with a chemical oxidizing agent and a ruthenium containing catalyst at...
5059611 Anti-inflammatory 5-hydroxy-2-furanones  
New 5-hydroxy-2-furanone compounds have anti-inflammatory, immunosuppressive and anti-proliferative activity and are useful in treating psoriasis and modifying calcium homeostasis.
5045564 Anti-inflammatory 2-furanones  
New 2-furanone compounds have calcium channel antagonist activity and are useful as anti-inflammatory agents and in treating psoriasis.
5030328 Method of separating γ-butyrolactone from mixtures containing diethyl succinate  
A method of separating γ-butyrolactone from a mixture containing ethanol, tetrahydrofuran, water, n-butanol, 1,4-butanediol, diethyl succinate and γ-butyrolactone, by distillation in vacuum columns.
4988825 Oxidation of aldehydes and ketones using alkali metal perborates  
Aldehydes and ketones, other than acetone, are oxidized with an alkali metal perborate in the presence of an acid.
4968817 Manufacture of gamma-crotonolactone by carbonylation of glycidol  
A process for preparing a substituted or unsubstituted gamma-crotonolactone is provided which comprises reacting a substituted or unsubstituted glycidol of the formula: ##STR1## wherein R 1 , R 2 ,...
4960906 Process for the preparation of lactones from higher alkenols  
Process for the preparation of lactones, having 4 or 5 carbon atoms in the ring by reacting a higher alkenol with a carbon monoxide containing gas in the presence of a catalytic system comprising ...
4954623 Recovery of difluoro sugar  
A process for recycling the difluoro sugar in the synthesis of 2,2-difluoronucleosides proceeds by removing the base moiety of α-difluoronucleosides by reduction and hydrolysis, followed by...
4945173 Process for the production of gamma-butyrolactone  
A process is described for the production of substantially pure gamma-butyrolactone from a feed mixture containing a major amount of gamma-butyrolactone and a minor amount of diethyl succinate...
4943652 Process for asymmetrically reducing carbonyl compounds  
There is disclosed a process for asymmetrically reducing a carbonyl compound, which comprises reducing the carbonyl compound by the use of a reducing agent comprising (i) an optically active...
4919765 Process for the purification of tetrahydrofuran  
Tetrahydrofuran is recovered by a two stage distillation procedure from a crude hydrogenation product resulting from vapor phase hydrogenation of diethyl maleate and containing water, ethanol and a...
4851540 Process for the production of biotin precursors  
Process for the production of imidazole derivatives of the formula: ##STR1## wherein R 1 is an (R)- or (S)-1-phenylalkyl group, an (R)- or (S)-1-alkoxycarbonyl-1-phenylmethyl group or an (R)- or...
4851085 Purification of butyrolactone  
A process which comprises treating butyrolactone in at least 95% purity with an acid to convert and remove color forming impurities for product stabilization.
4843093 Butyrolactone derivatives, process for production thereof and use therefor  
Butyrolactone derivatives having the formula ##STR1## wherein R is a C 4 -C 10 alkyl group, which have an appetite-regulating effect, a process for their production, and compositions containing...
4767869 Process for the production of gamma-butyrolactone  
A process is described for the production of substantially pure gamma-butyrolactone from a feed mixture containing a major amount of gamma-butyrolactone and a minor amount of diethyl succinate...
4659843 Process for preparing 3-methyl-2-butene-4-olide (4-methyl-2(5H)-furane-2-one)  
The invention relates to a process for preparing 3-methyl-2-butene-4-olide by the codimerization of methylenecyclopropane with carbon dioxide (CO 2 ) in the presence of organic complex compounds of...
4642358 Acyl modified polyphenylene ether composition  
Acyl modified polyphenylene ether compositions are provided by combining or reacting a polyphenylene ether polymer and a compound which contains both (i) at least one acyl functional group and (ii)...
4634780 Process for the production of lactones  
Lactones are produced by reacting an unsaturated alcohol capable of intramolecular esterification to form a lactone ring with carbon monoxide in the presence of a protonic acid and a catalyst...
4632784 Process for the preparation of 1α,23,25-trihydroxycholecalciferol-26-oic acid 23,26-lactone  
The invention is directed to a process and intermediates for the preparation of 1α, 23,25-trihydroxycholecalciferol-26-oic acid 23,26-lactone.
4625049 Alcohol carbonylation process using a bimetallic nickel catalyst  
A process for the preparation of carboxylic acids, alcohols, aldehydes or the secondary products thereof which comprises reacting an alcohol having from one to about twenty carbon atoms with...
4602006 Ynenolactone protease inhibitors  
Compounds of the formula ##STR1## wherein n is 1-3; R 1 , R 2 and R 3 are the same or different and are hydrogen, lower alkyl, lower alkenyl, lower alkynyl, aryl or aryl lower alkyl wherein when...
4596879 Process for producing intermediate furanones from diol derivative and thionyl chloride  
A novel process for the manufacture of the furanone of the formula ##STR1## is described. In this process, a diol is firstly reacted with thionyl chloride, then the sulphite formed, optionally...
Matches 101 - 150 out of 248 < 1 2 3 4 5 >