content_image/932136.jpg
# (19) United States 

# (12) Patent Application Publication Krill et al. 

# (54) PROCESS FOR THE PRODUCTION OF 2,2,6-TRIMETHYLCYCLOHEXANE-1, 4-DIONE 

(76) Inventors: Steffen Krill, Speyer (DE); Klaus Huthmacher, Gelnhausen (DE); Sylvain Perrin, Gueugnon (FR) 

Correspondence Address: SMITH, GAMBRELL & RUSSELL, LLP 1850 M STREET, N.W., SUITE 800 WASHINGTON, DC 20036 (US) 

(21) Appl. No.: 10/084,157 

(22) Filed: Feb.28,2002 

<img src='content_image/932136.jpg'>

(62) Division of application No. 09/850,156, filed on May 8, 2001. 

## (30) Foreign Application Priority Data 

(51) Int. Cl.7 ..................................................... C07C 45/27 

(52) U.S. Cl. .............................................................. 568/343 

## (57) ABSTRACT 

Process for the production of 2,2,6-trimethylcyclohexane-l, 4-dione by epoxidation of ~-isophorone with organic per› carboxylic acids at a water content below 5 wt.-% and subsequent isomerization of the mixture of ~-isophorone epoxide and hydroxyisophorone. 

US 20020165414Al 

# (10) Pub. No.: US 2002/0165414 Al 

# ( 43) Pub. Date: Nov. 7, 2002 

## Related U.S. Application Data 

May 17, 2000 (DE) ..................................... 100 24 264.2 

## Publication Classification 

