4-Methyl-8-vinyl-4,7- and -4,8-nonadienals

Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal

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252522, 260604R, 260632B, C07C 4720

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active

039637832

ABSTRACT:
The present invention relates to a novel process for preparing unsaturated aldehydes comprising four double bonds of formula ##SPC1##
Wherein one of the double bonds is represented by the dotted lines. Aldehyde Ia (called .alpha.-sinensal) corresponds to the above formula wherein the double bond represented by the dotted lines is in the main carbon chain. Aldehyde Ib (called .beta.-sinensal) corresponds to the above formula wherein the double bond represented by the dotted lines is in the side chain. The invention also relates to new intermediates used in the said new process and to methods for preparing them. The said intermediates have also valuable organoleptic properties and are useful as fragrances in the preparation of perfumes, perfumed products and artificial essential oils.

REFERENCES:
patent: 3574715 (1971-04-01), Marbet et al.
Swern, Organic Reactions, vol. 7, 1953, pp. 385, 388 and 399.
Braun et al., Ber., "Deutch Chemistre Gesel.", vol. 67, p. 1735 (1934).
Crandall et al., Journ. of Org. Chem., vol. 32, pp. 435-439, 1967.
Cresson et al., Compte Rend. Acad. Sci., vol. 262, Ser. C., pp. 1157-1160, 1966.
Julia et al., Bull. Soc. Chim., Ser. 5, No. 10, Oct. 1962, pp. 1947-1952.
Rosowsky, A., in Heterocyclic Compounds, Part I, 1964, pp. 1, 31, 40-43, 349-352.

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