Method of preparing dihalogen vinyl cyclopropanecarboxylic acid

Details Method of preparing dihalogen vinyl cyclopropanecarboxylic acid Method of preparing dihalogen vinyl cyclopropanecarboxylic acid

1978-08-28

1979-12-25

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

B01J 110

Patent

active

041804465

ABSTRACT:
A method of preparing certain dihalogen vinyl cyclopropane carboxylic acid esters of the formula ##STR1## wherein R is an alkyl moiety and X is chlorine or bromine by exposing a dihalogen vinyl dihydrofuran of the formula to light, e.g., ultraviolet light. Also disclosed is a method for preparing such 2,4,4-trimethyl-3-carbalkoxy-5-(.beta.,.beta.-dihalogen-vinyl)-4,5-dihydro furans by reaction of a .beta.-alkoxycrotonic acid ester or 3,3-bisalkoxybutyric acid ester with a 1,1,1-trihalogen-4-methyl-3- or -4-pentene-2-ol in the presence of an acid catalyst. Also disclosed is a method of converting such 2,4,4-trimethyl-3-carbalkoxy-5-(.beta.,.beta.-dihalogenvinyl)-4,5-dihydrof uran by thermal rearrangement into 2,5,5-trimethyl-3-carbalkoxy-4-(.beta.,.beta.-dihalogen-vinyl)-4,5-dihydro furans. Such 2,4,4- and 2,5,5-trimethyl-3-carbalkoxy-5-(.beta.,.beta.-dihalogenvinyl)-4,5-dihydrof urans are new.

REFERENCES:
patent: 3509197 (1970-04-01), Mitsch et al.
patent: 3657086 (1972-04-01), Matsui et al.
patent: 3674832 (1972-07-01), Scherlock et al.

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