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6887820 |
Method for producing optically active compounds
A method for producing optically active compounds is disclosed. The method is highly practical for producing optically active compounds useful for various utilities such as intermediates for...
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6433236 |
Acid catalyzed isomerization of substituted diaryls
A substituted diaryl compound or a mixture of substituted diaryl compounds, such as dimethylbiaryl compounds are isomerized by treatment with a strong acid or mixtures of strong acids in the...
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5399786 |
Preparation process of tert-butylphenols
The present invention has as purpose a process for the manufacture of tert-butylphenols, mainly of tertbutyl-4-phenols from a phenol and an alkyltert-butylether. The improvement consists in...
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RE34626 |
Isomerization of bisphenols
This invention relates to a process for the preparation of bisphenols and bisphenol mixtures by the isomerization of bisphenols on acid or alkaline catalysts in the presence of the corresponding...
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5053558 |
Process for the isomerization of cresols
An improved process is disclosed for the isomerization of a non-equilibrium mixture of cresols to achieve a high yield of one or more cresol isomers using a catalyst comprising a Group VIII metal,...
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5015785 |
Preparation of mixtures of isomeric cresols with a molar ratio of para- to meta-cresol of at least 0.6:1 to 10:1
A process for the preparation of mixtures of isomeric cresols with a molar ratio of para- to meta-cresol of from 0.6:1 to 10:1 by isomerization of cresol mixtures or ortho- and/or metal-cresol on...
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4709102 |
Process for producing 2-lower alkyl phenols
The production of a 2-lower alkyl phenol, e.g., 2-cresol or 2-ethylphenol, is carried out by transalkylation of a lower alkyl phenyl ether, e.g. anisole or phenetole, at an elevated temperature in...
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4691063 |
Isomerization of cresols
An improvement in a process for the isomerization of cresols may be obtained by effecting the isomerization reaction of a cresol in the presence of a phosphorous containing crystalline...
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4605790 |
Phenol from coal and biomass
Phenol is prepared from mixed phenols derived from coal or biomass by separation of the mixed phenols, isomerization of m- and/or p-cresols to o-cresol, demethylation of o-cresol, dealkylation of...
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4590306 |
Process for the conversion of meta/para-cresol mixtures
The instant invention relates to a process for the conversion of meta/para-cresol mixtures by catalytically methylating the meta/para-cresol mixtures in their ortho-positions, separating the 2,3,6-...
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4554388 |
Process for isomerization and transalkylation of alkylphenols
This invention relates to a process for isomerization and transalkylation of alkylphenols and for phenol-derivatives in the presence of a catalyst comprising ironoxide (s) and at least one...
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4538008 |
Preparation of ortho-alkylated phenols
Secondary or tertiary alkyl phenyl ethers may be induced to undergo thermal rearrangement on alumina, aluminum phosphate, or a silica-modified alumina as catalyst to afford the isomeric...
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4503270 |
Method of producing 2,3,6 trimethylphenol
A method is provided for producing 2,3,6 trimethylphenol by rearrangement of 2,4,6 trimethylphenol in the presence of an aluminum based catalyst, such as AlCl 3 , and an acid upon heating the...
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4484011 |
Process for preparation of 4-isopropylphenol
The process for preparing 4-isopropylphenol (4-IPP) from 2-isopropylphenol (2-IPP) comprising contacting phenol with 2-IPP in the presence of a catalyst system selected from: (1) the combination of...
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4476330 |
Conversion of ethers using a zeolite catalyst
Conversion, e.g. dehydration of aliphatic organic oxygenates having up to about 6 carbon atoms by contact with a crystalline aluminosilicate zeolite, preferably ZSM-5, having a silica to alumina...
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4465871 |
Preparation of 2-t-butyl-4-alkoxy- and 4-hydroxyphenols
Tertiary alkyl phenyl ethers may be induced to undergo thermal rearrangement on an alumina catalyst to afford the isomeric ortho-t-alkylphenol. Such rearrangement generally occurs under milder...
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4431846 |
Reduction of o-ethylphenol in m,p-cresol by preferential t-butylation
A process is disclosed for reducing the concentration of o-ethylphenol in m,p-cresol by partially t-butylating a mixture of the above and equilibrating the resultant mixture to convert...
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4424382 |
Superacid catalyzed preparation of resorcinol from meta-isopropylepheol
Resorcinol is prepared by an improved process through superacid (such as perfluorinated alkanesulfonic superacids of one to eighteen carbon atoms or polymeric perfluorinated resinsulfonic acids,...
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4346249 |
Preparation of para-isopropenylphenol
Para-isopropenylphenol can be obtained by dehydrogenation of para-isopropylphenol in the presence of a calcium-nickel phosphate catalyst, phenol, and water.
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4283572 |
Conversion of alkyl phenyl ether to alkylphenol
A process for the conversion of an alkyl phenyl ether to the corresponding alkylphenol, involving heating in the presence of a dehydrated sulfonic acid type cation exchange resin having a...
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4283571 |
Process for the catalytic isomerization of o-cresol
Isomerization of o-cresol to m-cresol by contact with a crystalline aluminosilicate zeolite of the ZSM-type, having a silica to alumina ratio greater than 5, at a temperature of about 350° to...
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4138411 |
Process for the isomerization of aromatic alkenyl compounds
Aromatic alkenyl compounds, for example, eugenol and safrole, are isomerized, for example to isoeugenol and isosafrole, by contact with a ruthenium or osmium catalyst.
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4103096 |
Preparation of meta-alkylphenols
Meta-alkylphenols are prepared by the isomerization of nonmeta-alkylphenols in the presence of trifluoromethane sulfonic acid. Ortho-isomer-containing alkylphenols are isomerized to increase their...
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4060563 |
Process for preparing 2-allyl phenol
A process for preparing 2-allyl phenol from phenol comprising an in situ reaction between phenol and an alkali metal hydroxide to form alkali metal phenoxide, adding allyl chloride to said alkali...
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3880937 |
Process for preparing 3-alkyl-5-t-butylphenols
A process for preparing 3-alkyl-5-t-butylphenols which comprises contacting 3-alkyl-6-t-butylphenols with aluminum chloride at a temperature below 70°C whereby the t-butyl group at the 6-position...
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3878255 |
Process for preparing 3,5-dialkyl phenols
A process for preparing 3,5-dialkyl phenols is provided. In one embodiment an ortho-, para-, or meta-monoalkyl phenol is caused to isomerize and/or disproportionate to the 3,5-dialkyl phenol in...
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3519692 |
PREPARATION OF META-RICH CRESOLS
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3014079 |
Process for preparing metaalkylphenols
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3655780 |
Title is not available
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3839470 |
Title is not available
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