Method for producing 2- (alkyl) cycloalkenone

Details Method for producing 2- (alkyl) cycloalkenone Method for producing 2- (alkyl) cycloalkenone

2006-06-06

2006-06-06

Witherspoon, Sikarl A. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C568S361000, C560S122000, C549S263000, C549S273000

Reexamination Certificate

active

07057077

ABSTRACT:
A method for producing 2-(alkyl)cycloalkenone and a method for producing alkyl(3-oxo-2-alkylcycloalkyl) acetate and 5-alkyl-5-alkanolide which are useful as flavoring materials and physiologically active substances using the same are provided. A method for producing Compound (2) including the steps of: dehydrating Compound (1) using an acid catalyst until the conversion ratio of dehydration reaction reaches 20 to 90% based on Compound (1), thereby obtaining a mixture containing Compound (1) and Compound (3); and isomerizing Compound (3) while dehydrating the remaining Compound (1), and a method for producing Compound (5) or (6) using obtained Compound (2).(wherein n represents 1 or 2, R1and R2each represent H, C1-8alkyl groups and the like and R3represents C1-3alkyl groups).

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