Process for the preparation of .gamma.-unsaturated carboxylates

Details Process for the preparation of .gamma.-unsaturated carboxylates Process for the preparation of .gamma.-unsaturated carboxylates

1981-05-18

1983-02-15

Trousof, Natalie

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

Organic compounds

Carboxylic acid esters

C07C 69533

Patent

active

043742645

ABSTRACT:
The invention concerns a process for the preparation of .gamma.-unsaturated carboxylic acid methyl esters by reacting an allyl alcohol with an excess of trimethyl orthoacetate in the presence of an acidic catalyst. The process involves: the slow addition of the allyl alcohol to trimethyl orthoacetate heated to a temperature at or near its boiling point; removal of portion of the trimethyl orthoacetate from the reaction mixture by distillation; and heating the remaining reaction mixture at a temperature of 130.degree. to 160.degree. C. to complete the reaction.

REFERENCES:
patent: 4113968 (1978-09-01), Mori et al.
Kondo, Kiyosi et al., "New Synthesis of the Acid Moiety of Pyrethroids", pp. 128-136 of ACS Symposium Series 42, Synthetic Pyrethroids, Elliott, Michael, ed. (1976).
Johnson, William S. et al., J. Am. Chem. Society, vol. 92 (1970), pp. 741-743.
CRC Handbook of Chemistry and Physics, 60th ed. (1979-1980) p. C-408.

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