环己二酮肟除草剂据报道在环境中易于光降解,但尚未详细研究其反应机理。在这里,我们研究了环乙二胺(CD)在乙腈和水中的光解,其中CD以两种不同的互变异构形式存在:酮在水中和烯醇形式,在烯醇质子和肟的氮原子之间具有分子内氢键在乙腈O–H⋯N中。CD(è异构体)在水中但不在乙腈中进行光异构化。该差异归因于存在于乙腈中的分子内氢键的抑制作用。在两种溶剂中,CD的照射都会导致N–O键的断裂,这由亚胺的形成证明。基团亚氨基可以在乙腈中通过纳秒激光闪光光解来检测(λ最大= 280,320和480nm处,τ〜100微秒)。该自由基对氧不具有反应性,但易于从甲醇中提取H原子(k = 1.8×10 5 M -1 s -1)。量子计算通过证明(i)亚胺基的最稳定结构在环碳和氮原子上具有大的自旋密度,(ii)烯醇式H原子被转移,证实了瞬态物质与亚胺基的分配(iii)分子内氢键O⋯H–N负责亚胺基长波长吸收及其高氢提取反应性。
The present invention relates to a herbicidal composition, comprising
A) one or more compounds of the formula (I)
1
in which
Hal
1
and Hal
2
are identical or different halogen atoms,
R
1
is H, a cation or a C
1
-C
20
-carbon-containing radical and
B) one or more surfactants, comprising as structural element at least 12 alkylene oxide units.
The present invention relates to a solid adjuvant comprising
a) one or more surfactants of the formula (I),
Ar—O—(CHR
1
—CHR
2
—O—)
y
—R
3
(I)
where
Ar is aryl which is substituted by at least two (C
1
-C
30
)alkyl radicals,
R
1
is H or (C
1
-C
6
)alkyl,
R
2
is H or (C
1
-C
6
)alkyl,
R
3
is H, an unsubstituted or substituted (C
1
-C
30
) hydrocarbon radical, a sulfonate radical, a phosphonate radical or an acyl radical, and
y is an integer from
1
to
100,
and
b) one or more fatty acid esters. The adjuvant is particularly suitable in the field of crop protection.
The present invention relates to a herbicidal composition comprising
a) one or more herbicidal active substances,
b) one or more surfactants other than silicone surfactants, and
c) one or more humectants.
The composition according to the invention is outstandingly suitable for controlling a variety of harmful plants.