Matches 151 - 200 out of 247 < 1 2 3 4 5 >
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4978653 Derivative of 2-cyclohexylpropanal and perfumery composition comprising the same  
2-Cyclohexylpropanal derivatives are disclosed. The derivatives are represented by the following formula (I): ##STR1## wherein P is a hydrogen atom and Q represents a group --CHN--OH or a group...
4962210 Process for the preparation of high-purity tetrahydrofuran  
Disclosed is a process for the preparation of high-purity tetrahydrofuran from a mixture of 2,5-dihydrofuran and 3,4-epoxy-1-butene and/or crotonaldehyde wherein the mixture is hydrogenated in the...
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...
4918204 Tetrahydrofuran purification  
Purification of tetrahydrofuran from the dehydrocyclization of 1,4-butanediol in the presence of an organic acid catalyst has been accomplished by the extractive distillation of crude...
4912236 Purification of tetrahydrofuran by distillation  
Crude water-containing tetrahydrofuran is purified by distillation by a process in which the crude tetrahydrofuran is passed through three distillation columns, water being removed from the bottom...
4875980 Method for separating and concentrating an organic component from an aqueous solution containing same  
Disclosed is a method for separating and concentrating an organic component having a lower boiling point than water from an aqueous solution containing the organic component which comprises the...
4866188 Synthesis of cyclic ethers  
A process is disclosed for preparing a cyclic ether which comprises cyclodehydrating a polyhydroxy compound of the general formula HOR 1 HC--R 2 --CHR 3 OH in which R 1 and R 3 , each of...
4861903 Intermediates for preparing optically active carboxylic acids  
A process is described for preparing optically active alpha-arylalkanoic acids consisting of rearranging an optically active ketal of formula ##STR1## in which the substituents have the meaning...
4841075 Method of preparing acetal or ketal  
A method of preparing an acetal or ketal from a corresponding aldehyde or ketone is disclosed. A hydrous oxide of an element of Group IV of the Periodic Table is used as a catalyst, and the...
4590285 Process for preparing a mixture of tetrahydrofuran and 3-alkyl tetrahydrofuran and copolymers thereof  
A mixture of 1,4-butanediol and 2-alkyl-1,4-butanediol is produced by catalytic hydrogenation and reaction with an aldehyde. Such mixture is cyclized to a mixture of tetrahydrofuran and 3-alkyl...
4549029 Substituted tetrahydrofurans  
Novel substituted tetrahydrofurans having a six-membered ring in the 4 position and methyl substituents in the 2 and 4 positions possess organoleptic properties described as fruity, citrus-like and...
4536584 Process for the thermochemical conversion of biomass  
A process is provided for the thermochemical conversion of biomass to useful gaseous and liquid organic products. The inventive process utilizes a catalyst to obtain increased yields of gaseous and...
4499291 Process for simultaneous hydrogenation of 2-butyne-1,4-diol and furan  
The hydrogenation of furan to tetrahydrofuran can be carried out simultaneously with the hydrogenation of 2-butyne-1,4-diol to 1,4-butanediol. This can be done in the same reactor, using a common...
4491585 Combating pests with novel phenoxypyridylmethyl esters  
New phenoxypyridylmethyl esters of the general formula ##STR1## wherein R 1 , R 2 and R 3 have the meaning given in the description and R represents the radical ##STR2## wherein R 4 and R 5 ...
4487953 9-Bromoprostaglandins, their preparation, and their use as medicaments  
Compounds of Formula (I) ##STR1## wherein the 9-bromine atom can be in the α- or β-position, R 1 is CH 2 OH or C(O)OR 2 , wherein R 2 is hydrogen, alkyl, cycloalkyl, aryl, or a...
4467118 Process for the catalytic synthesis of conjugated dienes from dialkylallylamines  
There is disclosed a novel process for converting allylic amines, having a hydrogen bonded to a carbon δ to the amino group, to a diene in the presence of a zero valent palladium phosphine complex...
4463177 Process for making m-hydroxyphenyl substituted compounds  
m-Hydroxyphenyl substituted compounds of formula ##STR1## where R is an organic radical and R 1 is hydroen or an organic radical are prepared by dehydrohalogenating a compound of formula ##STR2##...
4461676 Process for refining tetrahydrofuran  
The level of aldehyde and ketone impurities in tetrahydrofuran can be significantly reduced by bringing the tetrahydrofuran into contact with sodium borohydride and then separating the modified...
4459419 Hydrogenation process using cationic ruthenium-containing zeolite  
Zeolite-ruthenium catalysts in which the ruthenium is in the form of a cation are very effective in catalyzing the hydrogenation of a broad range of organic compounds.
4454339 9-Fluoroprostaglandin derivatives, and use as medicinal agents  
9-Fluoroprostane derivatives of Formula I ##STR1## wherein R 1 is CH 2 OH or ##STR2## wherein R 2 is hydrogen, alkyl, cycloalkyl, aryl, or a heterocyclic residue; or R 1 is the residue ##STR3##...
4413136 Purification of tetrahydrofuran  
The amount of methacrolein impurity in tetrahydrofuran made from acetylene and formaldehyde can be significantly reduced by treating it with hydrogen peroxide during an interval in the multi-stage...
4404127 Perfume compositions and perfumed materials and articles, containing phenyl-tetrahydrofurans as a fragrance  
Perfume compositions, perfumed materials and articles containing one or more phenyl-tetrahydrofurans. Use of one or more phenyl-tetrahydrofurans having formula 1 or 2 of the formula sheet in which...
4375549 Process for making silyl ethers  
Organic silyl ethers are prepared by contacting an acyclic carbonate ester with an organic silyl halide in the presence of an initiator compound at a temperature from about 50° C. to about 250° C.
4370488 Alkali metal complex compounds  
The invention includes novel alkali metal complex compounds (and processes for their preparation) which are useful, inter alia for the hydrogenation of alkali metals at room temperature or below...
4348262 Refining tetrahydrofuran  
In the refining of crude acidic tetrahydrofuran prepared from acetylene and formaldehyde, corrosion of refining equipment and formation of color-producing methacrolein can be minimized by bringing...
4347192 Derivatives of α,β-unsaturated ketones  
Derivatives of α,β-unsaturated ketones having anticonvulsant activity and methods of their preparation from heterocyclic phosphonium salts and acyclic phosphoranes are disclosed.
4332645 Process for the separation of methanol from mixtures of tetrahydrofuran with methanol and water  
A process for the continuous separation of methanol and water from a feed mixture containing predominantly tetrahydrofuran admixed with water, methanol and small amounts of additional compounds, in...
4309356 Oxidative dehydrogenation of alkenes or alkadienes to furan compounds  
Alkenes and/or alkadienes are contacted with molecular oxygen and an oxidative dehydrogenation catalyst consisting essentially of silver, molybdenum and oxygen, with the silver-to-molybdenum atom...
4304783 Thienyl, thienyloxy or furyl substituted prostaglandin derivatives in the 6-keto-PGE.sub.1 series  
The invention relates to new prostaglandin derivatives of the 6-keto-PGE 1 series, to processes and intermediates for their manufacture and to their use as medicaments.
4297517 Preparation of carbonyl compounds from allylethers  
A process for hydrolysing allylethers of the general formula: R 6 CHCR 5 --CR 4 --O--CR 1 R 2 R 3 wherein R 1 , R 2 , R 3 , R 4 , R 5 and R 6 , which may be the same or different,...
4271081 Process for the preparation of tetrahydrofuran  
Tetrahydrofuran is prepared by reacting a 1,4-dihalobutane such as 1,4-dichlorobutane with water in the presence of a strong acid. The product tetrahydrofuran can be recovered, for example, by...
4263443 Conversion of aldehydes  
Hydrocarbons and esters and/or acids are produced by heating aldehydes in the presence of an alcohol or an alcohol equivalent and in the presence of an iodine or bromine moiety and a rhodium or...
4261901 Synthesis of tetrahydrofuran  
Tetrahydrofuran is prepared by reacting propylene and aqueous formaldehyde stabilized with alcohol in the presence of silica sand to form 3-buten-1-ol and chlorinating the 3-buten-1-ol in the...
4257961 Purification of tetrahydrofuran  
The amounts of methacrolein-, dihydrofuran-and aldehydic impurities in THF made from acetylene and formaldehyde can be significantly reduced by hydrogenating them during an interval in the...
4255337 Novel odorants and flavorants  
The invention is concerned with odorant and/or flavoring substances, intermediates therefor, a process for the manufacture of said substances, odorant and/or flavoring compositions containing same...
4243597 Volatile uranyl compounds  
Novel compositions of matter are disclosed having the formula UO 2 AA'L n , wherein n is 0 or 1, and in which A and A' are anions whose conjugate acids have boiling points less than about 200° C....
4233228 Purification of tetrahydrofuran  
Tetrahydrofuran is purified by treatment with bleaching earth.
4229354 Method of preparing alkali metal complex compounds  
The invention includes novel alkali metal complex compounds (and processes for their preparation) which are useful, inter alia for the hydrogenation of alkali metals at room temperature or below...
4221726 Process of making tetrahydrofuran  
This invention provides a process for producing 1,4-butanediol by (1) selectively hydrogenating acrolein to a product mixture of allyl alcohol and residual acrolein in a 2:1 ratio, (2) converting...
4209651 Hydrogenation of butadienepolyperoxide to unsaturated diols  
A process for the hydrogenation of butadienepolyperoxide in a suitable solvent, e.g., tetrahydrofuran, at temperatures of 75°-110° C. and pressure above 2000 psia by contacting the...
4195026 Substituted furans from butenolides  
A method of preparing alkoxy and acyloxy furans from butenolides comprising reacting a butenolide with an alkylating agent in the presence of a base to provide an alkylated or acylated furan ring...
4175009 Separation of alcohol from tetrahydrofuran  
A process for separating one or more aliphatic alcohols selected from the group consisting of methanol, ethanol, isopropanol and tertiary butanol from a tetrahydrofuran stream comprising...
4160771 Synthesis of tetrahydrofuran  
This invention provides a process for producing tetrahydrofuran by the reaction of 3-(5'-alkyl-1',3'-dioxane)propionaldehyde and/or 3-(5'-alkyl-1',3'-dioxane)propanol and/or 4-hydroxybutanal with...
4146741 Conversion of furan to 1,4-butanediol and tetrahydrofuran  
Furan is hydrogenated in the presence of a nickel catalyst and a dicarboxylic acid having 4 to 10 carbons to produce 1,4-butanediol and tetrahydrofuran.
4144397 Preparation of 2-aryl-propionic acids by direct coupling utilizing a mixed magnesium halide complex  
Valuable 2-aryl-propionic acids are prepared by the direct coupling of aryl magnesium bromides with a mixed magnesium halide complex of alpha-bromopropionic acid.
4115408 Conversion of poly(tetramethylene ether) glycol in aqueous effluent stream to tetrahydrofuran  
A process for removing poly(tetramethylene ether) glycol from dilute aqueous acidic effluent streams thereof comprising the steps of (1) maintaining the stream in the liquid phase at a temperature...
4105677 Production of tetrahydrofuran  
This invention provides a process for producing tetrahydrofuran by (1) the condensation of 2-methyl-1,3-propanediol with acrolein to form 2-vinyl-5-methyl-1,3-dioxane; (2) the conversion of the...
4105792 Prostane dervatives  
Prostan-1-ol esters and intermediates for their preparation are described; the former compounds exhibit improved organ specificity and a longer duration of activity at lower dosages than the...
4002646 Process for making tetrahydrofurans  
Tetrahydrofurans are produced by (a) contacting gamma-chloroalkanols with an aqueous protonic solution by which the chloroalkanol is cyclized to form a tetrahydrofuran and (b) removing the...
3994931 Purification and hydrogenation of furan concentrates  
Furan concentrates containing deleterious unsaturated contaminants including sulfur compounds are purified prior to hydrogenation by contacting with zinc oxide either prior to or subsequent to...
Matches 151 - 200 out of 247 < 1 2 3 4 5 >