| Patent Number |
Title Of Patent |
Date Issued |
| 5977369 |
Process to prepare dihydropyridine and derivatives thereof |
November 2, 1999 |
| A novel process is disclosed for the preparation of dihydropyridine compounds and derivatives thereof, and more particularly felodipine. The process to prepare felodipine involves a two step procedure condensing 2,3-dichlorobenzaldehyde with methyl acetoacetate in the presence of a c |
| 5773591 |
Process for preparing coumarin sulfonates |
June 30, 1998 |
| A novel process for preparing sulfonic acid esters and amides of benzo-heterocyclic diazo diketo compounds, such as substituted diazo-4-oxo-3,4-dihydrocoumarins, which are useful synthetic intermediates in a wide variety of applications including photoresists, opto-electronics, agric |
| 5739295 |
Photoactive coumarin sulfonate compounds |
April 14, 1998 |
| A new class of 3-diazo-3,4-dihydrocoumarin compounds which are useful as photoactive compounds in a wide variety of applications including photoresists and other opto-electronic applications are disclosed and claimed. Preferred embodiments include 6-sulfonyl-3-diazo-4-oxo-3,4-dihydro |
| 5726296 |
Process for preparing photoactive coumarin derivatives |
March 10, 1998 |
| Novel processes for the preparation of a new class of coumarin derivatives, which are useful as photoactive compounds in a wide variety of applications including photoresists and other opto-electronic applications, are disclosed and claimed. The process involves a multi-step syntheti |
| 5726295 |
Photoactive coumarin derivatives |
March 10, 1998 |
| A new class of 3,4-dihydrocoumarin derivatives which are useful as photoactive compounds in a wide variety of applications including photoresists and other opto-electronic applications are disclosed and claimed. Preferred embodiments include ether, ester, carbonate, and sulfonate der |
| 5696274 |
Syntheses based on 2-hydroxyacetophenone |
December 9, 1997 |
| The present invention provides processes which are flexible, cost effective, and commercially viable methods of manufacturing or producing products from 2-hydroxyacetophenone (2-HAP).Of particular interest of the available products are 4-hydroxycoumarin, warfarin-alkali salt, preferably |
| 5602285 |
Process for preparing phenethanol ethers |
February 11, 1997 |
| Substituted phenethanol ethers are prepared in useful yields by the etherification of corresponding substituted phenethyl alcohols with aliphatic primary alcohols. The etherification is carried out by reacting a substituted phenethyl alcohol with an aliphatic primary alcohol in the p |
| 5600009 |
Use of 4-substituted 2-butanones to prepare nabumetone |
February 4, 1997 |
| The palladium-catalyzed coupling of aryl and vinyl halides with vinylic compounds is disclosed. A preferred embodiment relating to the palladium catalyzed coupling of 4-substituted and 6-substituted-2-methoxynaphthalene to form nabumetone is also disclosed. The beauty of this novel react |
| 5563300 |
Process for preparing 4-hydroxyphenylmethylcarbinol |
October 8, 1996 |
| The present invention provides a unique and novel way of producing carbinols such as 4-hydroxyphenylmethylcarbinol (HPMC). In this new process, a ketone such as 4-hydroxyacetophenone (4-HAP) is heated under suitable hydrogenation conditions of temperature and pressure in the presence |
| 5344980 |
Process for the preparation of 1,3,5-tris(4'-hydroxyaryl)benzene |
September 6, 1994 |
| 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-hydroxyacetophenone-anil by reacting the 4-substituted acet |
| 5300698 |
Process for the prepartion of 1,3,5-tris(4'-hydroxyaryl)benzene |
April 5, 1994 |
| 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-hydroxyacetophenone-anil by reacting the 4-substituted acet |
| 5247124 |
Process for the preparation of substituted styrenes |
September 21, 1993 |
| A process for preparing a substituted styrene by reacting a bisarylalkyl ether in the presence of an acid catalyst is disclosed. The process is preferably used for the preparation of 4-acetoxystyrene from 4,4'-(oxydiethylidene)bisphenol diacetate and 4-methoxystyrene from 4,4'-(oxydi |
| 5225603 |
Preparation of 4-(6'-methoxy-2'-naphthyl)-3-buten-2-one |
July 6, 1993 |
| An intermediate for the manufacture of nabumetone, 4-(6'-methoxy-2'-naphthyl)-3-buten-2-one, is prepared by contacting 2-bromo-6-methoxynaphphalene with methyl vinyl ketone in the presence of a palladium catalyst at from about 50.degree. C. to about 200.degree. C. for a time sufficie |
| 5210278 |
Process for the preparation of bisarylalkyl ethers |
May 11, 1993 |
| A process for preparing a substituted styrene by reacting a bisarylalkyl ether in the presence of an acid catalyst is disclosed. The process is preferably used for the preparation of 4-acetoxystyrene from 4,4'-(oxydiethylidene)bisphenol diacetate and 4-methoxystyrene from 4,4'-(oxydi |
| 5194672 |
Process for the preparation of substituted styrenes |
March 16, 1993 |
| A process for preparing a substituted styrene by reacting a bisarylalkyl ether in the presence of an acid catalyst is disclosed. The process is preferably used for the preparation of 4-acetoxystyrene from 4,4'-(oxydiethylidene)bisphenol diacetate and 4-methoxystyrene from 4,4'-(oxydi |
| 5151540 |
Thio carbamates and their derivatives |
September 29, 1992 |
| A method is provided for preparing N-acylaminothiophenols, e.g., N-acetyl-para-aminothiophenol, or aminothiophenols, e.g., para-aminothiophenol, or N,S-diacylaminothiophenols, e.g., N,S-diacetyl-para-aminothiophenol, by reacting any of certain sulfur-containing ketones, viz., an S-(a |
| 5132437 |
Synthesis of 1-aminoanthraquinone |
July 21, 1992 |
| 1-Aminoanthraquinone (1-AAQ) is synthesized by the reaction of 2-chlorobenzyl chloride and xylene in the presence of a solid acid catalyst to yield 2-chloro dimethyldiphenylmethane, subsequent oxidation of the methyl groups, ring closure to form a 1-chloroanthraquinone carboxylic aci |
| 5130448 |
Synthesis of 1-aminoanthraquinone |
July 14, 1992 |
| 1-Aminoanthraquinone (1-AAQ) is synthesized by the condensation of 2-substituted benzoic acid and xylene to yield 2-substituted-dimethylbenzophenone, subsequent oxidation of the methyl groups, ring closure to form a 1-substituted anthraquinone carboxylic acid, replacement of the 1-su |
| 5087769 |
Preparation of 6-substituted-2-vinylnaphthalene |
February 11, 1992 |
| A method of forming 6-substituted-2-vinyl naphthalene from a 2-substituted naphthalene compound wherein the substituent in the 2-position is an ortho-para directing electron-donating group not reactive with hydrogen fluoride, comprises contacting the naphthalene compound and an acylating |
| 5072025 |
Process for the production of 3,5-disubstituted-4-acetoxystyrene |
December 10, 1991 |
| 3-substituted-4-hydroxy- and 4-acetoxystyrene compounds, especially 3,5-di(methyl, bromo or chloro)-4-acetoxystyrene as well as a process for its preparation. 2,6-dimethylphenol is acylated with acetic anhydride and HF catalyzed to produce 3,5-dimethyl-4-hydroxy-acetophenone. After s |
| 5041614 |
Method for the preparation of 4-acetoxystyrene |
August 20, 1991 |
| A method for the preparation of 4-acetoxystyrene is disclosed. The method comprises heating 4'-acetoxyphenylmethylcarbinol in the presence of a suitable acid anhydride and a suitable dehydration catalyst in a continuous feed reaction mode to make the 4-acetoxystyrene. |
| 5041571 |
Process of producing anthraquinones in one step |
August 20, 1991 |
| A process for the preparation of anthraquinone compounds comprises reaction of phthalic anhydride with a benzene derivative in a reaction mixture containing HF and BF.sub.3 as catalyst at a first temperature up to about 30.degree. C. and, subsequently, at an elevated temperature. |
| 4994623 |
Process for producing thioalkyl or thioarylphenones |
February 19, 1991 |
| Thiophenones are produced by acylating the aromatic ring of thiophenolic ethers in the presence of anhydrous hydrofluoric acid. It has been found that if the thio group is in the form of a thioether and not a thiol, the aromatic ring can be acylated to form the thiophenone in the presenc |
| 4965400 |
Preparation of 3,5-disubstituted-4-acetoxystyrene |
October 23, 1990 |
| 3-substituted-4-hydroxy- and 4-acetoxystyrene compounds, especially 3,5-di(methyl, bromo or chloro)-4-acetoxystyrene as well as a process for its preparation. 2,6-dimethylphenol is acylated with acetic anhydride and HF catalyzed to produce 3,5-dimethyl-4-hydroxy-acetophenone. After s |
| 4933495 |
Process for the production of 3-mono or 3,5 dihalogenated 4-acetoxystyrene, its polymerization, |
June 12, 1990 |
| The present invention relates to a process for the production of 3-mono or 3,5-disubstituted-4-acetoxystyrene wherein the 3- or 3,5-substitution is independently C.sub.1 to C.sub.10 alkyl, chlorine, bromine, iodine, --NO.sub.2, --NH.sub.2, or --SO.sub.3 H, a process for its polymerizatio |
| 4929694 |
Copolymers of p-mercaptostyrene and its esters |
May 29, 1990 |
| There are provided novel copolymers of a p-mercaptostyrene ester, e.g., the acetate, with at least one comonomer selected from the group consisting of styrene, N-methylmaleimide, maleic anhydride and p-acetoxystyrene. These copolymers may be hydrolyzed to produce corresponding copolymers |
| 4927956 |
3,5-disubstituted-4-acetoxystyrene and process for its production |
May 22, 1990 |
| 3-substituted-4-hydroxy- and 4-acetoxystyrene compounds, especially 3,5-di(methyl, bromo or chloro)-4-acetoxystyrene as well as a process for its preparation. 2,6-dimethylphenol is acylated with acetic anhydride and HF catalyzed to produce 3,5-dimethyl-4-hydroxy-acetophenone. After s |
| 4868257 |
Process for the production of 3-mono or 3,5 disubstituted-4-acetoxystyrene, its polymerization |
September 19, 1989 |
| The present invention relates to a process for the production of 3-mono or 3,5-disubstituted-4-acetoxystyrene wherein the 3- or 3,5-substitution is independently C.sub.1 to C.sub.10 alkyl, chlorine, bromine, iodine, --NO.sub.2, --NH.sub.2, or --SO.sub.3 H, a process for its polymerizatio |
| 4868256 |
Process for the production of 3-mono or 3,5-disubstituted-4-acetoxystyrene its polymerization, a |
September 19, 1989 |
| The present invention relates to a process for the production of 3-mono or 3,5-disubstituted-4-acetoxystyrene wherein the 3- or 3,5-substitution is independently C.sub.1 to C.sub.10 alkyl, chlorine, bromine, iodine, --NO.sub.2, --NH.sub.2, or --SO.sub.3 H, a process for its polymerizatio |
| 4794205 |
Method for producing alkenylthiophenols and their esters |
December 27, 1988 |
| A method is provided for preparing alkenylthiophenols, e.g., para-vinylthiophenol, or their esters, e.g., para-vinylthiophenol acetate by reacting a hydroxy aromatic ketone, e.g., 4-hydroxyacetophenone (4-HAP) with an N,N-di(organo)thiocarbamoyl halide, e.g., N,N-dimethylthiocarbamoy |
