Chemistry of hydrocarbon compounds – Alicyclic compound synthesis – From nonhydrocarbon
Patent
1990-01-31
1990-10-30
Sneed, Helen M. S.
Chemistry of hydrocarbon compounds
Alicyclic compound synthesis
From nonhydrocarbon
585360, C07C 132, C07C 276
Patent
active
049670336
ABSTRACT:
The polyunsaturated compounds of formula ##STR1## having two conjugated double bonds in the endo- and exo- positions of the pentagonal cycle indicated by the dotted lines, and wherein symbols R.sup.1 and R.sup.2, when taken separately, represent respectively a. a linear or brached C.sub.1 to C.sub.4 alkyl radical and b. an hydrogen atom or a methyl radical, or, when taken together with the carbon atoms to which they are bonded form a polymethylenic cycle such as indicated by the dotted line, containing from 5 to 12 carbon atoms, and symbol R.sup.3 stands for an hydrogen atom or a methyl radical, n being an integer equal to 0 or 1, which are useful intermediate products for the preparation of odoriferous macrocyclic ketones, are prepared according to a process comprising a vapor phase cyclization of an enone of formula ##STR2## wherein the dotted line and the symbols n, R.sup.1, R.sup.2 and R.sup.3 are defined as above, effected by means of a thermal treatment of said enone in the presence of a cyclization catalyst consisting of an aluminum, silicium, titanium or zirconium oxide.
REFERENCES:
patent: 3911027 (1975-10-01), Skoranetz
patent: 4351977 (1982-09-01), Fehr
Firmenich S.A.
Saba J.
Sneed Helen M. S.
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