Process for preparation of trans-chrysanthemates

Details Process for preparation of trans-chrysanthemates Process for preparation of trans-chrysanthemates

1976-04-05

1977-09-13

Helfin, Bernard

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

Organic compounds

Carboxylic acid esters

C07C 6730

Patent

active

040482154

ABSTRACT:
A novel process for the preparation of alkyl esters of dl-trans chrysanthemic acid of the formula ##STR1## wherein R is alkyl of 1 to 6 carbon atoms comprising reacting in the presence of a strong base an alkyl 4-oxo-2E-butenoate of the formula ##STR2## with at least about 2 molar equivalents of a triphenyl isopropyl phosphonium halide which uses easily accessible starting materials.

REFERENCES:
patent: 3723469 (1973-03-01), Martel
Grieco, Tetrahedron Letters, pp. 3781-3783 (1972).
Bestmann, Angew. Chem., 74, pp. 154-155 (1962).
Kirmse, "Carbene Chemistry" 2nd Ed., pp. 68, 69, 73 & 74 (Academic Press, 1971).
March, "Advanced Organic Chemistry : Reactions, Mechanisms, and Structure," pp. 702-709 (1968).

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