Kannappan K Chockalingam

8236988, Aug 7, 2012

Aug 1, 2008

12/671743

Kannappan Chockalingam - Baton Rouge LA, US

Albemarle Corporation - Baton Rouge LA

C07C 209/68

564305, 564409

Methods are provided for preparing branched alkyl-substituted-anilines, such as 2-(1,3-dimethylbutyl)aniline. Such methods comprise combining aniline, an alkyl-substituted-1-alkene, such as 4-methyl-i-pentene, and an aluminum alkyl catalyst.

53150309, May 24, 1994

Sep 29, 1993

8/128505

Kannappan Chockalingam - Baton Rouge LA
Tse-Chong Wu - Baton Rouge LA

Ethyl Corporation - Richmond VA

C07C 6976

560105

A new process for preparing aliphatic carboxylic acid esters is provided. A substituted aliphatic ether or thioether compound is reacted with carbon monoxide in the presence of an alcohol in anhydrous conditions at a temperature between about 25. degree. C. and about 200. degree. C. An excess of several moles of anhydrous alcohol is preferred. An acid such as hydrochloric acid may also be added. As catalyst, a mixture of palladium or a palladium compound and a copper compound with at least one acid-stable ligand are present.

55502857, Aug 27, 1996

Jul 11, 1994

8/272455

William J. Layman - Baton Rouge LA
Kannappan Chockalingam - Baton Rouge LA
Jean-Pierre Lecouv e - 68100 Mulhouse, FR

C07C22900

562565

This invention relates to a process for the production of a solid calcium [S,S]-ethylenediamine-N,N'-disuccinate by the reaction of calcium aspartate and dihaloethane in an aqueous solvent.

53997476, Mar 21, 1995

Jan 27, 1994

8/187027

Kannappan Chockalingam - Baton Rouge LA
Tse-Chong Wu - Baton Rouge LA

Albemarle Corporation - Richmond VA

C07C 5110

562406

A new process for preparing aryl-substituted aliphatic carboxylic acids is provided. Aryl-substituted aliphatic ether or thioether compound is reacted with carbon monoxide in aqueous conditions at a temperature between about 25. degree. C. and about 200. degree. C. An acid such as hydrochloric acid may be added. As catalyst, a mixture of palladium or a palladium compound and a copper compound with at least one acid-stable ligand are present.

53150295, May 24, 1994

May 11, 1993

8/062902

Kannappan Chockalingam - Baton Rouge LA

Ethyl Corporation - Richmond VA

C07C 6976
C07C 5110

560105

A new process for preparing alkyl esters of ibuprofen is provided. A 1-halo-1-(4-isobutylphenyl)ethane is reacted with carbon monoxide in the presence of an anhydrous alcohol at a temperature between about 10. degree. C. and about 200. degree. C. An excess of several moles of alcohol is preferred. An acid such as trifluoroacetic acid is also added. As catalyst, a palladium compound and at least one acid-stable ligand over palladium are present; however, an excess of ligand over palladium is advantageous.

60969202, Aug 1, 2000

Jul 8, 1998

9/111935

Robert H. Allen - Baton Rouge LA
R. Carl Herndon - Baton Rouge LA
Kannappan C. Chockalingam - Baton Rouge LA
W. Dirk Klobucar - Baton Rouge LA
Gary D. Focht - Baton Rouge LA
Tse-Chong Wu - Baton Rouge LA
Gary D. Heidebrecht - Orangeburg SC
Joseph D. McLean - Orangeburg SC
Yaping Zhong - Columbia SC
Thorsten W. Brockmann - Columbia SC
Ronny W. Lin - Baton Rouge LA
William J. Layman - Baton Rouge LA
Ranjit K. Roy - Baton Rouge LA

Albemarle Corporation - Richmond VA

C07C 5110

562406

Palladium-catalyzed arylation of an olefin (e. g. , ethylene) with an aromatic halide (e. g. , 2-bromo-6-methoxynaphthalene, m-bromobenzophenone, or 4-isobutyl-1-bromobenzene) is conducted in specified media. After a special acid or base phase separation procedure, palladium-catalyzed carbonylation of the olefinically-substituted aromatic intermediate is conducted in specified media using CO and water or an alcohol to form arylalkylcarboxylic acid or ester or substituted arylalkylcarboxylic acid or ester (e. g. , racemic 2-(6-methoxy-2-naphthyl)propionic acid, 2-(3-benzoylphenyl)propionic acid, or 2-(4-isobutylphenyl)propionic acid). Catalyst recovery procedures enabling recycle of catalyst residues and efficient recovery of amine hydrogen halide scavenger and solvent used in the arylation reaction are described, as well as novel, highly efficient methods of conducting the carbonylation reaction. The technology is economical and suitable for use on an industrial scale whereby reaction mixtures can be efficiently separated into the desired component mixtures without need for excessive capital investment or tedious, time-consuming operations. High yields of high purity products can be achieved.

52783359, Jan 11, 1994

Jun 11, 1993

8/060186

Kannappan Chockalingam - Baton Rouge LA

Ethyl Corporation - Richmond VA

C07C 6976

560105

A new process for preparing alkyl esters of ibuprofen is provided. A 1-halo-1-(4-isobutylphenyl)ethane is reacted with carbon monoxide in the presence of an anhydrous alcohol at a temperature between about 10. degree. C. and about 200. degree. C. An excess of several moles of alcohol is preferred. An acid such as trifluoroacetic acid is also added. As catalyst, a mixture of a copper compound and a palladium or a palladium compound and at least one acid-stable ligand are present.