Herbicidal compounds are of the formula:
where R¹ = C1-3 alkyl, C1-6 alkoxy which may contain an unsaturated bond, C1-2 alkylthio, C1-3 alkylcarboxy or C1-3 alkylsulfonyloxy, all of which may be halo-substituted, C1-2 alkoxy-C1-2 alkoxy, C1-3 alkoxycarbonyl, hydroxycarbonyl, -CN, aminomethyl or o-or p-CH₂OH;
R² = C1-2 alkyl, C1-2 alkoxy or C1-2 alkythio all of which may be halo-substituted, or a halogen atom;
and one of R¹ and R² can be hydrogen;
R³ = C1-2 alkyl.
Five syntheses are described,
(A) from precursor where R³ is -CH₃ by reaction with R³O Metal in an inert solvent at 20-100°C for 0.5-5 hrs;
(B) from R¹ is -OH by reaction with a C2-C6 (halo) olefin, in an inert solvent at 30-150°C for 1-100 hrs;
(C) from R¹ is C1-3 (halo) alkylsulfonyloxy at the o- or m-position, with or without an inert solvent in presence of a base at 0-50°C for 0.5-5 hrs;
(D) from R¹ is C1-C6 (unsaturated) alkoxy at o- or m-position, by reaction with an alkyl, alkenyl or alkynyl halide, in an inert solvent in presence of a base at 20-150°C for 0.5-5 hrs.
(E) from R¹= C1-3 acyl by reaction with a diacyl ether, with or without an inert solvent and in presence of an acid catalyst at 0-100°C for 0.5-30 hrs.
The compounds are formulated with solid or liquid carriers or diluents into herbicidal compositions and are useful for control of weeds.
除草化合物的
化学式如下
其中 R¹ = C1-3 烷基、可能含有不饱和键的 C1-6 烷氧基、C1-2 烷
硫基、C1-3 烷基羧基或 C1-3 烷基磺酰氧基,所有这些烷氧基都可能被卤代、C1-2 烷氧基-C1-2 烷氧基、C1-3 烷氧基羰基、羟基羰基、-CN、
氨甲基或 o-or p-CH₂OH ;
R² = C1-2烷基、C1-2烷氧基或C1-2烷
硫基,所有这些都可以是卤代,或卤原子;
R¹ 和 R² 中的一个可以是氢;
R³ = C1-2 烷基。
本文介绍了五种合成方法、
(A) 由 R³ 为-CH₃的前体与 R³O Metal 在 20-100°C 的惰性溶剂中反应 0.5-5 小时;
(B) R¹为-OH,与 C2-C6(卤代)烯烃在 30-150°C 的惰性溶剂中反应 1-100 小时;
(C) R¹ 的 o 位或 m 位为 C1-3(卤代)烷基磺酰氧基,在有或没有惰性 溶剂、有碱存在的情况下,在 0-50°C 下反应 0.5-5 小时;
(D) R¹ 在 o 位或 m 位为 C1-C6(不饱和)烷氧基,与烷基、烯基或炔基卤化物反应,在有碱存在的惰性溶剂中,20-150℃,0.5-5 小时。
(E) R¹= C1-3酰基与
二乙酰基醚反应,可使用或不使用惰性溶剂,并在酸催化剂存在下,在 0-100°C 下反应 0.5-30 小时。
这些化合物与固体或液体载体或稀释剂配制成除草组合物,可用于控制杂草。