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7402713 Processes for conversion of tyrosine to p-hydroxystyrene and p-acetoxystyrene  
Tyrosine was converted to p-hydroxystyrene in a two-step reaction without purification of individual intermediates. Conditions were determined for bromination of tyrosine in which reactive...
7355063 Shogaol compound and tyrosinase activity inhibitor comprising the compound  
The compound represented by the following formula (1): wherein A, B, R1, R2, R3 and Z are as defined in the specification is analogous to shogaol and gingerol useful in the fields of foods,...
7112705 Process for preparing alkylated dihydroxybenzene  
The present invention relates to a process for the preparation of alkylated dihydroxybenzene by alkylating dihydroxy benzene with tertiary butyl alcohol in the presence of a solid acid/solid...
6911562 Process for the preparation of a cosmetic active  
A process for the preparation of a compound of formula I: wherein R is a hydrogen or a C 1-6 alkyl group which is straight chain, branched or cyclic, with or without an oxygen, nitrogen...
6806395 Process for preparation of 3,5-bisalkylphenols  
A process for producing a 3,5-bisalkylphenol (2) according to the following reaction scheme: (wherein R 1 represents a hydrogen atom, an alkali metal atom, an alkaline earth metal atom, or a...
6717020 Method of producing p-hydroxyphenylalkanols  
Disclosed are a method of producing p-hydroxyphenylalkanol of formula(I): wherein R 1 and R 2 independently represent hydrogen, an alkyl or a phenyl which may be substituted with an alkyl, or...
6670513 Process for producing alkylated hydroxyl-containing aromatic compounds  
An alkylated hydroxyl-containing aromatic compound is produced by isomerizing a normal alpha-olefin having from about 16 to about 30 carbon atoms in the presence of a first solid, acidic catalyst...
6451879 Phenolic resin, epoxy resin, and processes for producing these  
A process for producing a phenolic resin of good hue, characterized by reacting a hydroxylated aromatic compound with an unsaturated cyclic hydrocarbon compound in the presence of both active...
6407150 Processes for producing phenolic resin and epoxy resin  
A process for producing phenol resin having good color tone, which process comprises reacting hydroxyl group-containing aromatic compound and unsaturated cyclic hydrocarbon under the condition that...
6255538 Process for the C-alkylation of aromatic hydroxyl compounds  
Disclosed is a process for the preparation of dialkyl aromatic hydroxyl compounds such as dialkylphenols, dialkylbenzenediols, dialkylnaphthols and dialkylnaphthalenediols, especially...
6013844 Preparation of catechol monoethers and catechols  
A process for preparing catechol monoethers or catechols of the formula Ia or Ib ##STR1## where R 1 and R 2 are, independently of one another, hydrogen or C 1 -C 8 hydrocarbon radicals, and R 3...
5712231 Polymers having dihydroxy moieties  
The present invention provides novel polymers comprising a plurality of dihydroxy aromatic moieties and at least one polyalkyl moiety. In one embodiment of the present invention, the polymer is...
5663457 Methods for preparing alkylated hydroxyaromatics  
Conventional low vinylidene polyolefins are condensed with hydroxyaromatics under the influence of macroreticular ion exchange resins in acid form to yield alkylated hydroxyaromatics.
5543487 Hydroxymethylated resorcinol coupling agent and method for bonding wood  
A hydroxymethylated resorcinol coupling agent is provided, including a hydroxymethylated resorcinol as an active ingredient, which enables commercial thermosetting adhesives such as bisphenol-A...
5510402 Carboxylic acid esters of hydroxyphenylalkanols as stabilizers  
The novel compounds of the formula I ##STR1## in which n is an integer from the range from 4 to 8 and m is an integer from the range from 1 to 4, A is the aliphatic, aromatic, araliphatic or...
5420363 Optically active phenol derivatives and preparation thereof  
An optically active tri-substituted methane compound having, as substituents, an aromatic ring group and a phenyl group having hydroxyl group at ortho or para position can be obtained by allowing a...
5399785 Tyrosinase activity inhibitor  
Disclosed is a chemically stable tyrosinase activity inhibitor having high tyrosinase activity inhibition effect and low toxicity. The tyrosinase activity inhibitor has a structure of the formula:...
5393776 Tocotrienol analogs in the treatment of hypercholesterolemia and hyperlipidemia  
This invention relates to structurally novel acyclic tocotrienol analogs, which are useful for cholesterol/lipid lowering in cases of hypercholesterolemia and hyperlipidemia, and for...
5344997 Alkylation of aromatics using a fluorided silica-alumina catalyst  
A fluorided silica-alumina catalyst, particularly one with a silica:alumina ratio in the range of 1:1-9:1 containing from 1 to 6 weight percent fluoride, is particularly effective in the liquid...
5319148 Preparation of pyrocatechol monoethers and pyrocatechols  
The preparation of pyrocatechol monoethers or pyrocatechols of the formula Ia or Ib respectively ##STR1## ( R 1 and R 2 =H or C 1 --C 8 -hydrocarbon radicals; R 3 =C 1 --C 8 -hydrocarbon...
5302732 Use of ultra-low sodium silica-aluminas in the alkylation of aromatics  
Silica-aluminas having a sodium content less than about 0.1 weight percent show increased stability when used as a catalyst for the alkylation of aromatic compounds. Where such silica-aluminas are...
5235116 Process for the preparation of 2-(1-phenylethyl)hydroquinone and 2-(1-phenylethyl)hydroquinone diacetate  
Provided is an improved process for preparing 2-(1-phenylethyl)hydroquinone and its diacetate salt. In this process, the differential solubility of product and starting materials hydroquinone and...
5208390 Process for alkylating aromatic polyols with higher carbon number alpha olefin oligomers  
A process for alkylating an aromatic polyol, such as catechol, with an alpha olefin oligomer of alpha olefins having from about 8 to 14 carbon atoms or mixtures thereof using an organic sulfonic...
5132468 C-alkylation of hydroquinone or monoethers thereof  
The alkyl hydroquinones, e.g., methyl hydroquinone (a useful intermediate in the preparation of the monomer methyl hydroquinone diacetate, itself used for the synthesis of thermotropic polymers),...
5087771 Process for the purification of monotertiarybutyl hydroquinone  
A process for producing food-grade tertiary-butyl hydroquinone from impure montertiary butyl hydroquinone is provided. Impure monotertiary butyl hydroquinone crystals are agitated at an elevated...
5068465 Pharmaceutically active 3-aryl-2-fluoro-1-olefins  
This invention relates to novel 3-aryl-2-fluoro-1-olefins and their pharmacological use as dopamine beta-hydroxylase DBH inhibitors in the treatment of DBH mediated conditions such as hypertension.
5043494 Preparation of methylhydroquinone  
Methylhydroquinone (MeHQ) or methyl ether derivative thereof is prepared by contacting paramethoxyphenol or para-dimethoxybenzene with an acid catalyst, preferably a solid acid catalyst, at a...
4978789 Process for production of alkenyl substituted aromatic compound  
A process for producing an alkenyl substituted aromatic compound having the general formula (I): ##STR1## wherein Ar represents an aromatic ring, R 1 represents an alkenyl group having 2 to 8...
4959391 Phenol derivatives, pharmaceutical compositions containing these compounds and processes for the preparation of these compounds and compositions  
Phenol derivatives of the formula ##STR1## wherein A and B have the same or different meanings and each represent one of the groups --C.tbd.C--, cis--CHCH-- or trans--CHCH--, R 1 is...
4914245 Culpin  
Cultivation of a strain of the microorganism, Preussia sp., that has been deposited in the American Type Culture Collection as A.T.C.C. No. 20,923, yields a novel antibiotic substance, culpin, that...
4900476 Quinone intermediates for asymmetric synthesis of natural vitamin E  
An asymmetric synthesis for Vitamin E in an optically active pure form for 4-(2,5-diloweralkanoyloxy)-3,4,6-trimethylphenyl-butan-2-one and intermediates therein.
4859731 Polymeric dihydroxy compounds and their use as stabilizers for polymers  
Polymer dihydroxy compounds corresponding to the following formula ##STR1## in which R 1 , R 2 , R 3 =H or C 1 -C 4 alkyl, R 4 =H or C 1 -C 4 alkyl, R 5 =--C 6 H 5 , --C 6 H 4 CH 3...
4851587 Single solvent process for preparing 2-methallyloxy-phenol from catechol  
2-Methallyloxyphenol precursor to 2,3-dihydro-2,2-dimethyl-7-hydroxybenzofuran is prepared selectively and in good yield in the etherification of an alkali metal catecholate by methallyl chloride...
4849548 Hydrolysis of halo- and alkyl-substituted phenols  
A 4-halomethyl-3,5-dihalo-2,6-dialkylphenol is hydrolyzed by contact with water to form a 4-hydroxy-methyl-3,5-dihalo-2,6-dialkylphenol under conditions to minimize formation of the corresponding...
4835323 Hydroquinones  
New hydroquinones have the formula: ##STR1## wherein p is 1 or 2 and q is 0 or 1, provided that p+q is 1 or 2; R is a residue of formula: ##STR2## wherein Q is (i) -OX or (ii) -PO(OR 11 )((O) x R...
4827049 Process for the separation of dihydroxybenzene isomers  
This invention comprises a process for separating isomers of dihydroxybenzene (DHB) from a feed mixture comprising at least two of said isomers, which process comprises contacting the mixture at...
4801735 Pharmaceutical compounds  
Compounds are described of the following formula ##STR1## in which R 1 and R 2 are each hydrogen, C 1 -12 alkyl or C 2 -12 alkenyl, at least one of R 1 and R 2 being C 1 -12 alkyl or C 2 -12...
4769500 Process for preparation of 2,3,5-trimethylhydroquinone  
A process for preparation of 2,3,5-trimethylhydroquinone (TMHQ) from 2,3,5-trimethylbenzoquinone (TMBQ) is disclosed, comprising reducing TMBQ with hydrogen in the presence of a platinum group...
4689427 Hydroquinone derivatives useful in the production of vitamin E  
The present invention is directed to novel hydroquinone derivatives which are useful as intermediates for the manufacture of (R,R,R)-α-tocopherol (natural vitamin E) as well as of racemic...
4670604 Novel fluorinated resorcinol ethers  
4-Acylresorcinol ethers of the formula ##STR1## in which R 1 is lower alkyl, R 2 is fluorinated lower alkyl, R 3 is hydrogen, lower alkoxy, trifluoromethyl or halogen, alk is an alkylene or...
4661601 Resorcinol compounds  
New compounds having the formula 1 ##STR1## wherein W is hydrogen, halogen, n-alkyl, --NHCOR 1 , --COR 1 , or phenoxyacetylamino optionally substituted by one or two C 1 -12 straight- or branched...
4632771 Normally liquid C.sub.14 to C.sub.18 monoalkyl catechols  
This invention relates to normally liquid lubricating oil additives which provide both anti-oxidant and friction-modifying properties when added to lubricating oil. In particular, this invention...
4618627 Catechol derivatives and pharmaceutical compositions thereof for inhibiting anaphylaxis (SRS-A)  
A catechol derivative represented by the formula ##STR1## The compounds of this invention are useful for the prophylaxis and treatment for various allergic diseases, ischemic heart diseases and...
4599464 Novel compositions  
Novel compositions useful as antioxidants are formed by the reaction of resorcinol with an alkenylbenzene.
4598160 Intermediate phenolic compounds for the catalytic synthesis of chromans  
A catalytic synthesis of chromans in racemic or optically active forms, including intermediates thereto; the synthesis employs an asymmetric palladium (II) catalyzed oxidative cyclization of a...
4594460 Process for selective C-alkylation of phenols  
Substituted phenols of formula ##STR1## in which R 1 is in an ortho or para position relative to the phenol function and denotes ##STR2## R 2 denotes an acyclic radical optionally substituted by...
4590304 Protected ethynylated phenols  
An acetylenic end-capping agent of the general formula ##STR1## wherein R 1 and R 2 can be the same or different and are selected from the group consisting of hydrogen, C11 to C4 alkyl, phenyl...
4564476 Aryl fatty acid leukotriene synthesis inhibitors  
Aryl fatty acid compounds of the formula (I) ##STR1## wherein R 1 , R 2 , R 3 , X, and Y are as defined herein are novel and useful in the treatment of allergic and inflammatory disorders.
4510338 Resorcin derivatives, process for their preparation and pharmaceutical compositions containing them  
The invention relates to new resorcin derivatives of the formula (I) ##STR1## wherein R 1 and R 2 independently represent hydrogen, halogen, trihalomethyl, alkyl having from one to 3 carbon atoms...
4508926 4-Hydroxy-benzhydrols, process for their preparation and pharmaceutical compositions containing them  
The invention relates to new 4-hydroxy-benzhydrols of the formula (I) ##STR1## wherein R 1 and R 2 independently represent hydrogen, halogen, trihalomethyl, alkyl having from one to 4 carbon...
Matches 1 - 50 out of 175 1 2 3 4 >