Process for the preparation of dihalovinylcyclopropanecarboxylic

Details Process for the preparation of dihalovinylcyclopropanecarboxylic Process for the preparation of dihalovinylcyclopropanecarboxylic

1982-02-19

1983-12-06

Shippen, Michael L.

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

Organic compounds

Carboxylic acids and salts thereof

C07C 69743

Patent

active

044195249

ABSTRACT:
The invention relates to a new process for the preparation of cyclopropanecarboxylic acids of the formula (I) ##STR1## wherein X and Y independently stand for halogen, by the alkaline hydrolysis of the corresponding alkyl esters having 1 to 6 carbon atoms in the alkyl moiety, in or without a water-miscible organic solvent, in the presence of a phase transfer catalyst. The hydrolysis is carried out with a 2 to 50% by weight aqueous alkali hydroxide solution. If desired, under suitable conditions the cis/trans ratio of the original ester can be altered in the end products. The cyclopropanecarboxylic acids of the formula (I) are obtained in a high purity and are useful intermediates of insecticidally active pyrethroids.

REFERENCES:
patent: 3943167 (1976-03-01), Suzukamo
patent: 4024163 (1977-05-01), Elliott
patent: 4288610 (1981-09-01), Rumanowski
patent: 4306077 (1981-12-01), Leigh
Starks, "Phase Transfer Catalysis Principles and Techniques," pp. 1-9 (1978).

Affiliated with

Also associated with

Rating

Process for the preparation of dihalovinylcyclopropanecarboxylic does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the preparation of dihalovinylcyclopropanecarboxylic, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of dihalovinylcyclopropanecarboxylic will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2030780