Mark Robert Rubino

US Patent:

54930600, Feb 20, 1996

Filed:

Sep 16, 1994

Appl. No.:

8/307127

Inventors:

Mark R. Rubino - Monroeville PA
Jeffrey S. Salek - Oakdale Borough PA

Assignee:

Aristech Chemical Corporation - Pittsburgh PA

International Classification:

C07C 3917
C07C 3700

US Classification:

568721

Abstract:

This invention provides a unique method of producing 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane ("BPTMC"). The disclosed method manufactures BPTMC from ketals and hemithioketals of 3,3,5-trimethylcyclohexanone ("TMC"). The reaction takes place in the presence of an acid catalyst, and optionally added co-catalysts. Additionally, applicants have disclosed a particularly useful method of manufacturing BPTMC from TMC and alcohol and/or thiol starting materials. These starting materials react to form the TMC ketal or thioketal materials. This method is particularly useful in that it allows recovery and recycling of the alcohol and/or thiol.

US Patent:

51498669, Sep 22, 1992

Filed:

Aug 14, 1991

Appl. No.:

7/746276

Inventors:

Mark R. Rubino - Monroeville PA
Susan W. Jahoda - Corpus Christi TX
Daniel Lindley - Corpus Christi TX
John R. Battler - Corpus Christi TX

Assignee:

Hoechst Celanese Corporation - Somerville NJ

International Classification:

C07C 6501
C07C32700

US Classification:

562478

Abstract:

The present inventon pertains to a process for the preparation of omega-arylalkanoic acids of the genral formula R--Ar--R. sup. 1 --COOH wherein R is hydrogen, hydroxy, C. sub. 1 -C. sub. 8 alkyl, C. sub. 1 -C. sub. 8 alkoxy, or aryl; wherein R. sup. 1 is C. sub. 1 -C. sub. 4 alkyl; and wherein Ar is an aryl group which can be further substituted with at least one of hydroxy, C. sub. 1 -C. sub. 8 alkyl, C. sub. 1 -C. sub. 8 alkoxy, aryl, halide, amino, or acetamido. The omega arylalkanoic acids of the given formula are prepared using catalysts which provide an improvement over the known Willgerodt-Kindler reaction. The present invention also pertains to methods for removing sulfur during the above-described process for the preparation of the omega-arylalkanoic acids.