Production of chrysanthemic acid esters and homologues thereof

Details Production of chrysanthemic acid esters and homologues thereof Production of chrysanthemic acid esters and homologues thereof

C - Chemistry, Metallurgy

07

C

260/479.1

C07C 69/747 (2006.01) B01J 27/08 (2006.01) C07C 67/00 (2006.01) C07C 67/30 (2006.01) C07C 69/65 (2006.01) C07C 69/74 (2006.01) C07C 69/743 (2006.01) C07D 307/28 (2006.01)

Patent

CA 1116178

Production of chrysanthemic acid esters and homologues thereof Abstract of the disclosure A three-step process for the production of chrysanthemic acid esters and their homologues of the formula: Image I in which Rl and R2 are hydrogen or Cl-C6 alkyl, R3 and R4 are Cl-C6 alkyl or halogen or, together with the C atom to which they are attached, form a cycloalkyl group, and R5 is Cl-C6 alkyl, which comprises: (1) decarboxylating a lactone of the formula: VIII Image (2) trenting the resulting decarboxylated lactone to effect ring cleavage, halogenation and esterification to form an ester of the formula: Image X in which X is Cl, Br or I, and (3) treating the ester X with a base to effect internal condensation whereby the desired product of formula I is obtained. The esters I are valuable intermediate for the preparation of synthetic pyrethroids having insec- ticidal activity.

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