New process for the preparation of...

C - Chemistry – Metallurgy – 07 – C

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C07C 69/16 (2006.01) C07C 37/07 (2006.01) C07C 67/00 (2006.01) C07C 69/28 (2006.01) C07C 69/63 (2006.01) C07C 69/74 (2006.01) C07C 69/78 (2006.01)

Patent

CA 2269404

The invention relates to a new process for the preparation of 2,3,5-trimethylhydroquinone diesters by rearrangement of 2,6,6-trimethylcyclohex-2-ene-1,4-dione (4-oxo-isophorone, ketoisophorone) in the presence of a solid, acid catalyst and an acylating agent, for example carboxylic acid anhydrides or carboxylic acid halides. The 2,3,5-trimethylhydroquinone diester may then optionally be saponified to the free 2,3,5-trimethylhydroquinone, which is a valuable building block in the synthesis of vitamin E.

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