| 摘要 |
O-ethyl S-alkyl S-isopropyl phosphorodithiolates of the formula (I),
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wherein R is methyl or ethyl group are useful nematocides.
<??>Such a compound can be prepared by (a) reacting a dithiophosphoric acid salt of the formula,
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wherein M is an alkali metal atom and A is isopropyl, methyl or ethyl group, with a halogenated compound of the formula,
X-B
wherein X is a halogen atom, and B is isopropyl, methyl or ethyl group, provided that B is methyl or ethyl group when A is isopropyl group, and B is isopropyl group when A is methyl or ethyl group,
(b) reacting a thiophosphoric acid chloride of the formula,
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wherein A is as defined above, with a mercaptan of the formula,
B - SH
wherein B is as defined above, in the presence of an acid binding agent,
(c) reacting a thiophosphoric acid chloride of the above formula, with a mercaptide of the formula,
B - SM
wherein B and M are as defined above,
(d) reacting a phosphorochloridodithioite of the formula,
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wherein G is methyl or ethyl group, with ethanol in the presence of an acid binding agent to synthesize a phosphorodithioite of the formula,
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wherein G is as defined above, and treating said phosphorodithioite with an oxidizer peroxide, or
(e) reacting a phosphorochloridodithiolate of the formula,
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wherein G is as defined above, with ethanol in the pressence of an acid binding agent. |
