GB632589A - Production of insecticides and synergists - Google Patents

Abstract

Methylene dioxy ethers of the general formula <FORM:0632589/IV (b)/1> where R is a saturated bivalent aliphatic hydrocarbon radical, A is hydrogen or alkyl, R1 is alkyl, cycloalkyl, aralkyl, aryl, or heterocyclic, A1 is a saturated bivalent hydrocarbon radical having two or three carbon atoms and n is an integer from 1 to 3, are prepared by reacting with splitting off of sodium halide, an organic sodium alcoholate and an organic halide, the organic radical of one of the organic reactants being <FORM:0632589/IV (b)/2> and the other being <FORM:0632589/IV (b)/3> compounds of the first type mentioned include methylenedioxy propyl benzyl chloride, 1-(3 : 4 - methylenedioxyphenyl) - chlorpropane, 3 - (3 : 4 - methylenedioxyphenyl) - bromopropane, and piperonyl bromide. Compounds of the second type mentioned include ethers of monoethylene glycol and polyethylene glycols such as diethylene glycol monobutyl ether, ethylene glycol monomethyl ether, diethylene glycol ethyl ether, triethylene glycol ethyl ether, ethylene glycol butyl ether and the hexyl and octyl ethers of ethylene glycol and diethylene glycol, and ethers containing instead of an alkyl group an aryl, heterocyclic or carbocyclic group such as tetrahydro furfuryl and phenyl ethers as well as ethers of higher glycols such as propylene glycol and hexylene glycol. Numerous examples are given. The compounds are stated to be powerful insecticides and synergists.ALSO:Insecticidal compositions comprise compounds of the general formula <FORM:0632589/VI/1> where R is a saturated bivalent aliphatic hydrocarbon radical, A is hydrogen or alkyl, R1 is alkyl, cyclalkyl aralkyl, aryl or or heterocyclic, A1 is a saturated bivalent hydrocarbon radical having two or three carbon atoms and n is an integer from 1 to 3. They may be mixed with pyrethrins, enabling a small amount of pyrethrins to be used such as in the proportion of 30 mg. of pyrethrin and 300 mg. of the above compound dissolved in 100 c.cs. of kerosene. The compounds can also be used as active ingredients in insecticidal dusts such as a dust base made from 2.5 per cent. of the above compound, 0.2 per cent. of pyrethrins on a carrier of exhausted pyrethrin flowers. This base may be further diluted by a carrier such as talc.