Herbicidal sulfonamides, preparation and use thereof, and compositions containing them
申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0023422A2
公开(公告)日:1981-02-04
Compounds of the general formula:
and their agriculturally suitable salts, wherein
W is O or S;
R is CHF2, CF3, CH2CF, or CF2CHFG, where G is F, Cl, CF3 or Br;
A is O or S(O)n, where n is 0,1 or 2;
R1 is H, F, Cl, Br or CH3;
X is CH3 or OCH3;
Y is CH3, OCH3, OCH2CH3, (CH2)mOCH3 (where m is 1 or 2), OCH2CH2OCH3, or OCHR2CD2R3, where R2 is H or CH, and R3 is CH3 or C2H3; and
. E is CH or N, exhibit potent herbicidal activity. They are of particular interest for selective weed control in wheat. Some compounds may also exhibit plant growth regulant effects. The compounds can be formulated for agricultural use in conventional manner.
The compounds can be made by reacting the appropriately substituted sulfonyl isocyanate or isothiocyanate with the appropriate 2-aminopyrimidine or 2-aminotriazine; alternatively the appropriately substituted benzenesulfonamide can be reacted with the appropriate 2-isocyanato or 2-isothiocyanato-pyrimidine or -triazine.
Useful as intermediates in these processes are compounds of the general formula
wherein R A and R are as defined above and L is Cl, NH2, -NCO or -NCS.
通式如下的化合物
及其农业上适用的盐类,其中
W 是 O 或 S
R 是 CHF2、CF3、CH2CF 或 CF2CHFG,其中 G 是 F、Cl、CF3 或 Br;
A 是 O 或 S(O)n,其中 n 是 0、1 或 2;
R1 是 H、F、Cl、Br 或 CH3;
X 是 CH3 或 OCH3
Y 是 CH3、OCH3、OCH2CH3、(CH2)mOCH3(其中 m 是 1 或 2)、OCH2CH2OCH3 或 OCHR2CD2R3,其中 R2 是 H 或 CH,R3 是 CH3 或 C2H3;以及
.E 是 CH 或 N,具有很强的除草活性。它们对选择性控制小麦中的杂草特别有意义。某些化合物还具有植物生长调节作用。这些化合物可按常规方法配制成农用制剂。
这些化合物可通过适当取代的磺酰异氰酸酯或异硫氰酸酯与适当的 2-氨基嘧啶或 2-氨基三嗪反应制得;或者,适当取代的苯磺酰胺可与适当的 2-异氰酸基或 2-异硫氰基嘧啶或三嗪反应制得。
通式如下的化合物可作为这些工艺的中间体
其中 R A 和 R 如上定义,L 为 Cl、NH2、-NCO 或 -NCS。