Patent GB-582907-A (GB)
Title: Improvements in or relating to pest control compositions
IPC: A01N31/14
Filed: 1944-08-04
Abstract: Di - ethers of di - (hydroxy - aryl) - trichloro - methyl methane are prepared by condensing one mol. of chloral with 2 mols of a phenol or phenol ether in the presence of an acidic condensing agent such as sulphuric acid, hydrochloric acid, aluminium trichloride or boron trifluoride.  The etherification of the hydroxyl groups may be effected before or after condensation. If an ester such as phenyl acetate is used in the condensation, it may rearrange by way of the Fries rearrangement to a hydroxy acetophenone, the phenol thus obtained being condensed with the chloral and the free hydroxyl etherified.  The products which may be so obtained include di-(p-ethoxyphenyl)-trichloromethyl methane, di - (p - methoxyphenyl) - tri - chloromethyl methane and di - (p - methyl - o - methoxyphenyl)-trichloromethyl methane.ALSO:A pesticide comprises a di-ether of a di(hydroxy-aryl) trichloromethyl methane dispersed in a liquid or in a finely divided inert solid.  Suitable diethers are those in which the hydroxyl group is etherified by methyl, ethyl, propyl, butyl or amyl alcohols, the specific compounds referred to being di(paramethoxyphenyl) trichloromethyl methane, di(para-ethoxyphenyl) trichloromethyl methane and di-(para-methylortho-methoxyphenyl) trichloromethyl methane.  The compositions may be in the form of aqueous sprays, dusts or solutions, or dispersed with wetting agents such as alkali metal or amine salts of oleic acid and the sulphonated higher alcohols, the sulphonated animal and vegetable oils such as sulphonated fish or castor oils or sulphonated petroleum oils.  Suitable solid diluents include calcium phosphate, Bancroft clay, kaolin, diatomaceous earth, sulphur, lime, pyrophyllite, talc, bentonite or flours such as walnut shell, wheat, redwood, soya bean and cottonseed.  Suitable solvents include trichloroethylene, tetrachloroethylene, Stoddard solvent and hydrocarbons.  The compounds may be used as sprays in petroleum or vegetable oil glycerides.  Adhesive and sticking materials such as rosin and glue may be present.  The composition may contain other insecticides such as metallic arsenates, fluosilicates, phenothiazines, n-dodeyl thiocyanate, fenchyl thiocyano acetate, butylcarbitol thiocyanate, nicotine, anabasine (neo-nicotine), non-nicotine, roterone, hellebore, pyrethrum, N-isobutyl-undecylenamide and aminoethyl sulphides, and bactericides and fungicides such as sulphur, polysulphides such as lime-sulphur, chlorinated phenols, aminomethyl sulphides, copper acylacetonates, copper chelates of b -keto acids and esters, copper chelates of salicylaldehyde, Burgundy mixture, Bordeaux mixture, basic copper sulphates, copper oxychlorides, copper calcium chlorides, copper oxides, silicates, zeolites and thiocyanates, long chain quaternary ammonium halides and ferric dimethyldithiocarbonate.  According to examples, (1) a solution of di(para-methoxyphenyl) trichloromethyl methane in acetone is mixed with talc to form a paste whereupon the acetone is evaporated; (2) a mixture of tricalcium phosphate and bentonate is treated with a solution of di-(para-methoxyphenyl) and lauryl alcohol in acetone, the resulting paste being dried with agitation to a homogenous powder which is dispersed in water; (3) Di(paramethoxyphenyl) trichloromethyl methane is dissolved in acetone together with the sodium salt of sulphated oleyl acetate; (4) the same compound is dissolved in a refined kerosene named "Deobase." Specifications 547,871, 547,874, 566,386 and 566,387 and U.S.A. Specification 2,161,462 are referred to.