Preparation of ionones

Details Preparation of ionones Preparation of ionones

1984-08-06

1986-01-21

Lone, Werren B.

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

Organic compounds

Oxygen containing

568343, C07C 4921

Patent

active

045658943

ABSTRACT:
Ionones are prepared by cyclization of pseudoionone with concentrated sulfuric acid in the presence of an organic solvent or diluent, while cooling, and by dilution of the reaction mixture with water, by a continuous process in which the pseudoionone is combined with an aliphatic or cycloaliphatic hydrocarbon which boils at 25.degree.-65.degree. C. under the reaction conditions, or an aliphatic chlorohydrocarbon, and the sulfuric acid, with thorough mixing and evaporative cooling by partial or complete vaporization of the solvent present in the reaction mixture, combination being effected so that the temperature of the reaction mixture is from 25.degree. to 65.degree. C. and the residence time of this mixture before it is diluted with water is from 0.5 to 20, preferably from 0.1 to 5, seconds.
The novel process can be used to prepare .alpha.- and .beta.-ionone in a technically simple and advantageous manner and in very good yields.

REFERENCES:
patent: 2877271 (1959-03-01), Kaiser et al.
patent: 3475764 (1969-10-01), Pot et al.
patent: 3480677 (1957-07-01), Mevly
patent: 3886215 (1975-05-01), Desimone
Noller, "Chemistry of Carbon Compounds", (1965) p. 955.
Abstract of ".beta.-Ionone" by Tomuljak, D. et al., Czech 179,046, Jun. 15, 1979, Appl. 74/3,229, May 6, 1974; 2 pp., 92:146997b.

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