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Patent Searching and Data


Matches 1,401 - 1,450 out of 7,063

Document Document Title
WO/1994/001387A1
An advantageous process for producing cresols which comprises the steps of: preparing a solution of oxidation products containing tertiary and primary hydroperoxides by oxidizing cymene with oxygen, lowering the content of the primary hy...  
WO/1994/000423A1
A process is disclosed for preparing compounds having general formula (I) by cross-coupling boric acids, borine acids or boric anhydrides derived therefrom having general formula (II), in which x1, x2, x3 and x4 represent independently f...  
WO/1993/020030A1
A process for hydrodehalogenating halogenated aromatics present in a contaminated aqueous environmental source in which the halogenated aromatics are reacted with hydrogen gas or a source of hydrogen gas in the presence of a basic proton...  
WO/1993/020031A1
The purity of a tetrabromobisphenol-A (TBPPA) product can be enhanced so as to make it more valuable as a flame retardant by contacting it with a quality-enhancing amount of water having a resistivity > 50,000 ohms and subsequently heat-...  
WO/1993/016969A1
A process is provided for the catalytic perfluoroalkylation of aromatic compounds, wherein a perfluoroalkyl iodide or mixture of iodides is reacted with an aromatic compound in the presence of an aqueous base, such as an alkali metal hyd...  
WO/1993/016975A1
The invention provides a process for preparing aryl ethanols from aryl methyl ketones. The process involves a novel oxidation of the ketone to a dialkylacetal derivative of an aryl glyoxal, which is then hydrolyzed to an aryl glyoxal. Th...  
WO/1993/015063A1
Monomeric benzotriazole, benzophenone, 3,3-diphenyl-2-cyanoacrylate, 2,2,6,6-tetramethylpiperidine, hindered phenol, and diazo derivatives of 4'-hydroxyacetophenone, 4-hydroxystyrene, 1,1,1-tris(4'-hydroxyphenyl)ethane, 1,3,5-tris(4'-hyd...  
WO/1993/014065A1
Compounds of formula (I) wherein R1 is hydrogen, alkyl, halogen, nitro or alkyl or aromatic sulfonyl, x is an integer from 1 to 4, when x is greater than 1, The R1 substituents on any one or all of positions 2, 3, 5 and 6 and can be the ...  
WO/1993/014053A1
Novel 4-substituted acetophenone anils and methods for preparing 1,3,5-tris(4'-hydroxyphenyl)benzenes from 4-substituted acetophenones such as 4-hydroxyacetophenones or, from substituted 4-hydroxyacetophenone-anils such as 4-hydroxyaceto...  
WO/1993/011258A1
The method for assaying the SOD (super oxide dismutase) activity in a liquid medium is based on the activation of self-oxidization, by SOD activity, of a reactive agent having the general formula (I) wherein $i(either) n is 1 or 2, R?1¿...  
WO/1993/009074A2
Compounds having acidic protons and a molecular structure which can delocalize the electron density of the conjugate base (target compounds) are chlorinated by contacting such compounds with a perchloroalkane and aqueous base in the pres...  
WO/1993/006073A1
The process for rectification of phenol, said phenol prepared from crude phenol being the product of decomposition of cumene hydroperoxide and having previously been distilled to remove large portions of acetone, cumene and alpha methyls...  
WO/1993/006072A1
A process for preparing a 3- or 4-hydroxybenzocyclobutene comprises reacting a 3- or 4-halobenzocyclobutene reactant with an alkali metal hydroxide by heating in an aqueous alcohol medium at a temperature from about 50 °C to a temperatu...  
WO/1993/005005A1
In a process for separating phenol obtained by the decomposition of cumene hydroperoxide from high boiling impurities, the improvement comprising: a) feeding phenol rectification bottoms comprising phenol, acetophenone, cumylphenol, alph...  
WO/1993/004027A1
Disclosed is an improved process for the preparation of phenylhydroquinone wherein hydroquinone is first alkylated with cyclohexene to produce cyclohexylhydroquinone which is then dehydrogenated to obtain phenylhydroquinone. The improvem...  
WO/1993/002996A1
A process for removing guaiacols from naturally occurring cresylic acid mixtures by pyrolysis is described.  
WO/1992/022519A1
Process for the preparation of a phenol by an oxidative decarboxylation in the gas phase of a corresponding arylcarboxylic acid in the presence of a Cu-containing catalyst, characterized in that the following process steps are carried ou...  
WO/1992/022498A1
A synthetic crystalline zeolite, MCM-49, has in its as-synthesized form an X-ray diffraction pattern including values substantially as set forth in Table (I).  
WO/1992/021639A1
A process of using fast pyrolysis in a carrier gas to convert a waste phenolic resin containing feedstreams in a manner such that pyrolysis of said resins and a given high value monomeric constituent occurs prior to pyrolyses of the resi...  
WO/1992/018449A1
Phenols, and related aromatic compounds, phenolic ethers, can be hydroxylated selectively using hydrogen peroxide in the presence of an amorphous or microcrystalline zirconium phosphate catalyst in a solvent containing an aliphatic carbo...  
WO/1992/016955A1
In order to produce a cast resin coil (1) composed of several axially superimposed flat coils (17), the flat coils (17) are at first produced by winding a first inner and a second outer partial windings (3, 5) and by inserting therebetwe...  
WO/1992/014691A1
Hydroxylation of phenol is prone to the production of tarry by-products. Selective hydroxylation of phenol can be obtained by reacting a limited amount of hydrogen peroxide with phenol in solution in a compatible organic solvent and in t...  
WO/1992/012114A1
A process for producing an aromatic hydroxy compound by oxidizing directly an aromatic compound with an oxidizing agent, wherein the reaction is conducted in the presence of a catalyst comprising at least one platinum-group metal or its ...  
WO/1992/010456A1
A process for producing food-grade tertiary-butyl hydroquinone from impure monotertiary butyl hydroquinone is provided. Impure monotertiary butyl hydroquinone crystals are agitated at an elevated temperature while in contact with a non-p...  
WO/1992/010455A1
A process for dehydrating compounds of formula (I), where -R is -CH=CH2, -C=CH, -C=N or (a) in an aqueous solution thereof is disclosed. In the case where R is -CH=CH2 or -C=CH, the temperature is preferably at least 50 °C and preferabl...  
WO/1992/010458A1
2,6-Hydroxynaphthoic acid is made by reacting 2-naphthol with cesium or rubidium hydroxide to obtain cesium or rubidium naphthoxide, and reacting the naphthoxide with CO2 in the presence of cesium or rubidium carbonate.  
WO/1992/009550A1
The subject of the present invention is a process to manufacture high-purity bisphenol A to be used as feedstock for producing epoxy and polycarbonate resins. The method of the invention consists of reacting simultaneously phenol with ac...  
WO/1992/008450A2
A therapeutical use is provided for compounds selected from the group which consists of (a) phenols of formula (I), wherein R is a C¿1-12? alkyl group, a C¿2-12? alkenyl group, a C¿2-12? alkynyl group, a C¿1-12? alkoxy group, a formy...  
WO/1992/007812A1
A process for preparing bisphenol fluorene products which comprises reacting fluorenone with a phenol compound in the presence of an acidic condensing agent in a solution of an organic liquid wherein the bisphenol fluorene compound is in...  
WO/1992/006936A1
Essentially linear alkyl aromatics wherein the alkyl is attached to the aromatic ring at the beta-position are produced by the process wherein a linear hydrocarbon selected from the group consisting of linear alpha-olefins, linear alpha-...  
WO/1992/007052A1
Additives for improving the low temperature flow properties and oxidative stability of hydrocarbon oils are disclosed, which comprise the alkylation of a phenol in the presence of a dipolar aprotic cosolvent to produce an essentially lin...  
WO/1992/003400A1
A method of preparing bisphenol A of high purity, in which a degree of concentration of slurry product of bisphenol having phenol added thereto in the crystallization tank is estimated on-line with the computer on the basis of material b...  
WO/1992/003399A1
A method of preparing bisphenol A of high purity, in which composition of reacted mixture and saturation?.¿dissolution temperature of bisphenol under reaction conditions are estimated on-line with the computer when phenol and acetone ar...  
WO/1992/000943A1
The invention relates to a process for purifying bisphenol-A containing solvents. To provide such a process it is proposed to cause the bisphenol-A containing solvents mixed with water or an aqueous NaCl solution to melt above 85 °C, to...  
WO/1991/018858A1
A highly selective process for para-methylolating a phenolic compound, which comprises conducting the reaction of the phenolic compound with a formaldehyde source in an alcoholic organic solvent in the presence of a quaternary ammonium a...  
WO/1991/016286A1
A process is disclosed for producing $g(a)-fluorostyrol from fluorolefines. A halogen aromate (1) is converted into a $g(a)-fluorostyrol (III) with a fluorine substituted ethylene (II) in the presence of a palladium catalyzer. R may repr...  
WO/1991/011411A1
A process for alkylating an aromatic compound comprises contacting the aromatic compound with at least one alkylating agent in the presence of a catalyst comprising a synthetic porous crystalline zeolite having the above diffraction line...  
WO/1991/010634A1
Nitrogen-containing aromatic heterocyclic ligand-metal complexes and their use for the activation of hydrogen peroxide and dioxygen are disclosed. Processes whereby activated hydrogen peroxide or dioxygen are used to transform various or...  
WO/1991/009890A1
A process for preparing phenol-formaldehyde resole resins and adhesive compositions in which portions of the phenol normally contained in said resins are replaced by a phenol/neutral fractions extract obtained from fractionating fast-pyr...  
WO/1991/009674A1
A catalyst for use in hydrogenation, dehydrosilylation of ketones, and hydrosilylation of dienes or acetylenes, which comprises a complex of the general formula: A?+�[M�2?H(CO)�10?]?-�, wherein A represents an alkali metal, ammon...  
WO/1991/009002A1
An improved process for the preparation of vinyl ethers by the coupling reaction of an ester of formula (I), with a carbonyl containing compound of formula (II), wherein A and R are passive organic groups and OY is a hydroxyl group or OP...  
WO/1991/006518A1
Described is a method of preparation of fluorobenzenes with at least one hydrogen atom substituted on the ring and, optionally, other substituents which, independently of each other, can be chlorine, bromine, nitro, hydroxy, C¿1?-C¿3? ...  
WO/1991/005755A1
Bisphenols of virtually any degree of purity are obtained by crystallisation from hydrocarbons with a boiling point of over 200 °C, possibly after the phenol has been distilled off in the presence of the aforementioned solvents.  
WO/1991/003443A1
This invention is a process for the monoalkylation or dialkylation of aromatic (preferably biphenyl compounds) to produce alkylated aromatics (particularly dialkylated biphenyl compounds), using specific catalysts (preferably dealuminate...  
WO/1991/001288A1
The invention concerns a method for the preparation of chloranil by chlorinating 1 mole of hydroquinone with 4 to about 8 moles of chlorine gas in about 15 to about 37 % by wt. hydrochloric acid at temperatures between about 10 �C and ...  
WO/1990/015041A1
A process for the preparation of phenylhydroquinone by the reaction of a mixture of a benzenediazonium compound, hydroquinone and water while maintaining the pH in the range of about 3 to about 9.  
WO/1990/012776A1
A process for synthesising 9,9-bis(4-hydroxyphenyl) fluorene by the conversion of fluorenone with an excess of phenol with the aid of a fluid catalyst, for the production of which aluminium trichloride is dissolved in a non-aqueous organ...  
WO/1990/009973A1
Process is disclosed for the preparation of 4-substituted aryl olefins from 4-substituted aryl iodides. 4-Substituted aryl iodides are contacted with an olefin in an ester solvent in the presence of a catalyst system comprising a palladi...  
WO/1990/007480A1
The present invention provides a process for the conversion of a reactant into a reaction product in the presence of a solid acid catalyst comprising one or more fluorine atoms, sulfo radicals and phosphono radicals, each such radical be...  
WO/1990/007511A1
Triggerable dioxetanes with a fluorescent molecule containing group bonded or tethered in the dioxetane so as to produce fluorescence from the group are described. The compounds are useful in immunoassays and in probes using enzymes or o...  

Matches 1,401 - 1,450 out of 7,063