PROCEDE POUR LA PREPARATION DU PROPANOATE DE (E)-3,7-DIMETHYL-2,7-OCTADIEN-1-YLE

PROCEDE DE PREPARATION DU PROPANOATE DE (E)-3,7-DIMETHYL-2,7-OCTADIEN-1-YLE DE FORMULE I, EN FAISANT REAGIR LE (E)-3,7-DIMETHYL-2,6-OCTADIEN-1-OL DE FORMULE II:-SOIT AVEC UN AGENT DE PROPIONATION TEL QUE LE CHLORURE PROPANOIQUE, PUIS UN HYPOHALOGENITE DE BUTYLE TERTIAIRE;-SOIT D'ABORD AVEC L'HYPOHALOGENITE, PUIS AVEC UN AGENT REDUCTEUR ET ENFIN AVEC L'AGENT DE PROPIONATION;-SOIT D'ABORD AVEC UN AGENT ACYLANT, PUIS AVEC DE L'HALOGENITE ET ENFIN AVEC L'AGENT DE PROPIONATION.APPLICATION DE CE COMPOSE DE FORMULE I NOTAMMENT POUR LE TRAITEMENT DES ARBRES FRUITIERS. A compound of the formula is prepared by a./ reacting /E/-3,7-dimethyl -2,6-octadien-1-ol of the formula /II/ with a propionating agent, preferably propanoic chloride, reacting the propanoate thus obtained with a tert.butyl hypohalide, preferably tert.butyl hypochlorite in a moderately acidic adsorbent, preferably Kieselgel, reacting the halo compound of the general formula /III/ thus obtained wherein R stands for propionyl and Hal represents halogen, with a moderately reactive metal hydride in a polar solvent; or b./ reacting /E/-3,7-dimethyl-2,6-octadien-1-ol of the formula /II/ with a tert.butyl hypohalide, preferably hypochlorite in a moderately polar solvent, in the presence of a moderately acidic adsorbent, preferably Kieselgel, treating the halo compound ofthe general formula /III/, wherein R represents hydrogen and Hal is as defined above, with a reducing agent, reacting the alcohol of the formula /IV/ thus obtained with a propionating agent, preferably propanoic chloride; or c./ converting/E/-3,7-dimethyl-2,6-octadien-1-ol of the formula /II/ with an acylating agent, preferably acetic anhydride, into a compound of the general formula /V/, wherein R is a C1-5 acyl group, adding a tert.butyl hypohalide, preferably tert.butyl hypochlorite, to the C7 double bond thereof in an aprotic, moderately polar solvent, in the presence of a moderately acidic adsorbent, preferably Kieselgel, reducing the compound of the general formula /III/ thus obtained, wherein R is a C1-5 acyl group, with a metal hydride, reacting the alcohol of the formula /IV/ thus obtained with a propionating agent, preferably propanoic chloride; and separating the compound of the formula /I/ thus obtained from the reaction mixture. Traps for destroying male San Jose Scale are baited with the compounds of formula I.