Preparation of .alpha.- and .beta.-cyclocitral, and the N-methyl

Details Preparation of .alpha.- and .beta.-cyclocitral, and the N-methyl Preparation of .alpha.- and .beta.-cyclocitral, and the N-methyl

1981-07-02

1982-11-09

Helfin, Bernard

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

Organic compounds

Amino nitrogen containing

564279, 568447, C07C11900, C07C 4500

Patent

active

043586147

ABSTRACT:
An improved process for the preparation of cyclocitrals of the general formula I ##STR1## via the novel N-methylaldimines of the general formula II ##STR2## and the novel N-methylaldimines of the formula II. The cyclocitrals of the formula I are obtained in yields of 80-90%, based on citral employed. The compounds I and II are important intermediates for the preparation of fragrances and carotinoids, such as vitamin A, and products related thereto.

REFERENCES:
patent: 3365481 (1968-01-01), Wittig et al.
Henbest et al., Jour. Chem. Soc. (London) (1952), 1154-1159.
Gedye et al., Can. Jour. Chem., vol. 49 (1971), 1764-1766.
Colombi et al., Helv. Chim. Acta, vol. 28 (1951), 265-273.

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