C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 69/14 (2006.01) C07C 67/00 (2006.01) C07C 67/04 (2006.01) C07C 69/017 (2006.01)
Patent
CA 2297357
This invention relates to a process for the production of 2,3,5-trimethylhydroquinone diesters by aromatisation of 2,6,6-trimethyl-2-cyclohexene-1,4-dione (4-oxoisophorone, ketoisophorone, KIP) with an acylating agent and an acidic soluble or insoluble catalyst, which process may be operated alternatively continuously or discontinuously. A carboxylic anhydride having a C1 to C9 alkyl residue is used as the acylating agent, and after the reaction, a portion of the resultant carboxylic acid optionally may be removed by distillation. The reaction solution is cooled, the product which has crystallised out is separated and washed, and the filtrate is returned to the reaction.
Hafner Volker
Huthmacher Klaus
Krill Steffen
Markowz Georg
Shi Nongyuan
Degussa Ag
Degussa-Huls Aktiengesellschaft
Marks & Clerk
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