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    • 7. 发明授权
    • Dialkyl pyrazinyl phosphorothioates
    • 二烷基吡嗪基硫代磷酸酯
    • US2918468A
    • 1959-12-22
    • US68227857
    • 1957-09-06
    • AMERICAN CYANAMID CO
    • DIXON JAMES KDU BREUIL SHIRLEYBOARDWAY NANCY L
    • C07F9/6509
    • C07F9/650976
    • The invention comprises O,O-dialkyl O-(2-pyrazinyl) thiophosphates of the formula: wherein R and R1 are C1-C4 alkyl radicals, and X, Y, and Z represent hydrogen, halogen, e.g. chlorine or bromine, phenyl, or C1-C4 alkyl. They may be obtained by reacting a dialkyl phosphorochloridothioate (RO)(R1O)P(S)Cl with a hydroxypyrazine of the formula: or an alkali metal salt thereof in an inert solvent. When the free hydroxypyrazine is used the reaction is preferably carried out in the presence of a hydrogen chloride acceptor, e.g. an alkali metal- or alkaline earth metal carbonate. Suitable reaction temperatures are from 10 DEG to 100 DEG C., preferably 20 to 60 DEG C. Specified solvents are water, dimethyl formamide, dioxane, N-methyl-2-pyrrolidone, acetonitrile, benzene, toluene, xylene, lower aliphatic monohydric alcohols containing up to six carbon atoms, ketones and esters. Several examples are given. The products have nematodicidal properties (see Group VI). The dialkyl phosphorochloridothioates used as starting materials may be obtained by reacting two molecular equivalents of a dialkyldithiophosphoric acid or an alkali metal salt thereof with three molecular equivalents of chlorine at a temperature of 0-60 DEG C.ALSO: Seeds are coated with a thiophosphate ester of the formula in which R and R1 are alkyl radicals containing not more than 4 carbon atoms, and X, Y and Z represent hydrogen or a halogen or phenyl radical, or an alkyl radical containing not more than 4 carbon atoms (see Group IV(b)). The thiophosphate ester may be adsorbed on or mixed with an inert powdered substance such as activated carbon, charcoal, kaolin, bentonite, talc, pumice, silica, chalk, fuller's earth or wood flour. Alternatively it may be dispersed in a liquid such as water, e.g. with the aid of a dispersing or surface-active agent. In an example, tomato seeds are coated with an activated carbon dust containing 0, 0-diethyl 0- (2- pyrazinyl) phosphorothioate.ALSO:A nematodicidal composition comprises an inert carrier and a thiophosphate ester of the formula wherein R and R1 are C1-C4 radicals and X, Y and Z are hydrogen, halogen, phenyl, or C1-C4 alkyl radicals (see Group IV (b)). The invention also includes compositions comprising discrete amounts of a fertile soil and a thiophosphate ester as defined above in an amount effective to inhibit the growth of nematode larvae therein. The inert carrier may be a solid, e.g. kaolin, bentonite, talc, pumice, silica, chalk, wood flour, fuller's earth, activated carbon or charcoal, or may be a liquid, e.g. water, which may be used in conjunction with a dispersing or surface-active agent.