GB469022A - New fungicidal and bactericidal agents - Google Patents

Abstract

Organo-mercury compounds of the formula R--[O--Alk]n--O--C2H2R<1>2--Hg--X in which R represents alkyl or aralkyl, R<1> signifies hydrogen, alkyl or aryl, n is 1 or 2, Alk stands for an alkylene residue and X represents hydroxyl or a salt-forming group, are prepared by reacting a mercuric salt, or mercuric oxide and a mercuric acid, with an olefinic compound C2H2R<1>2 in the presence of an ether-alcohol R--[O--Alk]n--OH containing no halogen. The mercuric salt may be formed in situ from yellow mercuric oxide and an acid, and the residue X may be exchanged by double decomposition. The products are useful as fungicidal and bactericidal agents and may be applied, either as dusts in admixture with carriers such as talc or in the form of aqueous solutions or dispersions. Examples are given of the interaction of (1) ethyleneglycol monoethyl ether, ethylene, and mercury acetate; instead of the said ether, ethyleneglycol monomethyl or monobutyl ether or diethyleneglycol monoethyl ether may be used and yellow mercuric oxide may be employed in addition to mercuric acetate; treatment of the product with sodium chloride yields the corresponding mercury chloride compound; (2) ethyleneglycol monoethyl ether, ethylene, yellow mercuric oxide and glacial acetic acid; (3) ethyleneglycol monomethyl or monoethyl ether, propylene, mercuric acetate and yellow mercuric oxide; addition of brine forms the chloride of the product; (4) ethyleneglycol monobenzyl ether, ethylene, yellow mercuric oxide and glacial acetic acid; the product is treated with brine; (5) ethyleneglycol monoethyl ether, styrene and mercuric acetate, and reaction of the product with oxalic acid. Other olefines mentioned are butylene and phenylethylene, and as ether alcohols diethyleneglycol monomethyl ether and trimethyleneglycol monoethyl ether are also specified. Reference is made to a dust composition for treating oats comprising 3 parts by weight of the organo-mercury compound, 3 parts of glycerine and 94 parts of talc. Specifications 335,527, [Class 81 (i)], 411,507, and 427,974 are referred to.ALSO:Compositions for the immunization or preservation of seeds, bulbs, tubers, corns, &c. consist of organo-mercury compounds of the formula R-[O-Alk]n-O-C2H2R12-Hg-X in which R represents alkyl or aralkyl, R1 signifies hydrogen, alkyl or aryl, n is 1 or 2, Alk stands for an alkylene residue and X represents hydroxyl or a salt-forming group, together with an inert carrier such as talc, or comprise an aqueous solution or dispersion of the organo-mercury compound containing wetting and spreading agents. Thus, a mixture of 3 parts by weight of organo-mercury compound, 3 parts of glycerine and 94 parts of talc may be used for the treatment of oat seed infected with leaf stripe.