A process for preparing 2,5,6-trimethyl-2-cyclohexen-1-one

Details A process for preparing 2,5,6-trimethyl-2-cyclohexen-1-one A process for preparing 2,5,6-trimethyl-2-cyclohexen-1-one

C - Chemistry, Metallurgy

07

C

C07C 49/603 (2006.01) C07C 45/72 (2006.01) C07C 45/74 (2006.01)

Patent

CA 2263625

A process for preparing 2,5,6-trimethyl-2-cyclohexen-1-one by reacting diethyl ketone with crotonaldehyde or a compound which is converted under the chosen reaction conditions into crotonaldehyde, in the presence of basic agents at elevated temperature, which comprises a) simultaneously pumping one mole of crotonaldehyde or one mole of a compound which is converted under the reaction conditions into crotonaldehyde, about 5 to 30 moles of diethyl ketone and the aqueous solution or suspension of a strong base, through separate lines or at least partly in the form of a suitable mixture, continuously into a pressure vessel, which is heated where appropriate and which ensures vigorous mixing, in such a way that b) the reaction temperature is between 150°C and 350°C, and the average residence time in the pressure vessel is only about 0.1 second to 20 minutes.

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