Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1982-03-24
1984-02-14
Reamer, James H.
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
568417, C07C 4545
Patent
active
044318448
ABSTRACT:
An improved process for the preparation of unsaturated ketones of the general formula I ##STR1## where R.sup.1 is --CH.sub.3, ##STR2## and R.sup.2 and R.sup.3 are different and each is H or --CH.sub.3, by reacting an aldehyde of the general formula II ##STR3## with a molar excess of acetone or methyl ethyl ketone at an elevated temperature in the presence of an aqueous alkali metal hydroxide solution, wherein (a) all the reactants are mixed thoroughly, (b) the temperature is kept at from 10 to 120.degree. C. above the boiling point of the lowest-boiling component and (c) the pressure is kept at from p to 100 bar, where p is the vapor pressure of the mixture at the reaction temperature.
The products methylpseudoionone, dimethylpseudoionone, pseudoirone, methylpseudoirone and dimethylpseudoirone are useful scents and scent intermediates. In addition, pseudoionone is an important intermediate for the industrial preparation of vitamin A, and 6-methyl-hepta-3,5-dien-2-one is a sought-after aromatic.
REFERENCES:
patent: 2957027 (1960-10-01), Beets et al.
patent: 3470209 (1969-09-01), Lamparsky et al.
patent: 3840601 (1974-10-01), Gradeff
patent: 3975451 (1976-08-01), Fujita et al.
Sause et al., Chem. Abst., vol. 71, #38,354 (1969).
Arnold Lothar
Hoffmann Werner
Janitschke Lothar
Scheiper Hans-Juergen
Stroezel Manfred
BASF - Aktiengesellschaft
Reamer James H.
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