Dihalomethylenelactone pyrethroid intermediates

Details Dihalomethylenelactone pyrethroid intermediates Dihalomethylenelactone pyrethroid intermediates

1981-05-22

1982-06-01

Fan, Jane T.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D30793

Patent

active

043327303

ABSTRACT:
The novel dihalomethylenelactone of formula (I) can be prepared by the trihalomethylation of an anhydride of formula (II). Reaction of compound (II), wherein R.sub.1 =R.sub.2 =methyl, with CBr.sub.3 COONa in DMF gave at -25.degree. C. the dibromovinyllactone and with CCL.sub.3 COONa in DMF at 0.degree. C. the dichlorovinyllactone. ##STR1## X.sub.1, X.sub.2 and X.sub.3 are halogen atoms and R.sub.1 and/or R.sub.2 are hydrogen atoms and/or alkyl groups with 1-10 carbon atoms;

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patent: 4166063 (1979-08-01), Martel et al.
Winston et al., Jour. Amer. Chem. Soc., 88:18, Sep. 20, 1966.

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