PRODUCTION OF UNSATURATED KETONE
    6.
    发明专利

    公开(公告)号:JPH11152245A

    公开(公告)日:1999-06-08

    申请号:JP25520098

    申请日:1998-09-09

    Applicant: BASF AG

    Abstract: PROBLEM TO BE SOLVED: To obtain an unsaturated ketone which is an intermediate for synthesizing a useful flavor and a natural substance by reacting isopropenyl ether with a ketal of acetone with propene, etc., in the reaction between an allyl alcohol and isopropenyl ether. SOLUTION: An allyl alcohol of formula I (R to R are each H, an alkyl, an alkenyl or the like) or a propargyl alcohol of formula II is reacted with an isopropenyl ether of formula III (R is 1-4C alkyl) with forming a ketal of formula IV to give unsaturated ketones of formula V and formula VI. The isopropenyl ether of the formula III is obtained by reacting the ketal of formula IV with propyne or allylene or its mixture in a vapor phase at a raised temperature in the presence of a heterogeneous catalyst containing silicon or oxygen and zinc or cadmium. The ketal of the formula IV is resupplied for producing the isopropenyl ether of the formula III.

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