Bispyribac-sodium

Common name:

bispyribac-sodium;

IPUAC name:

sodium 2,6-bis(4,6-dimethoxypyrimidin-2-yloxy)benzoate;

Chemical Abstracts name:

sodium 2,6-bis[(4,6-dimethoxy-2-pyrimidinyl)oxy]benzoate;

Cas RN:

125401-92-5;

Development codes:

KIH-2023;

 

PHYSICAL CHEMISTRY

Molecule weight: 

452.35;

Molecule frame:

C19H17N4NaO8

Form:

white crystal solid;

Melt point：

223-224℃;

Vapour pressure：

5.05 *10^-9 Pa (25℃);

Kow:

LogP=-1.03(23℃);

Henry:

3.12 × 10-11 Pa m3 mol-1 (calc.) ;

S.g/density:

0.0737(20℃);

Solubility:

In water 73.3 g/l (25 ºC). In methanol 26.3, acetone 0.043 g/l (25 °C);

Stability:

Stable in water; DT50 >1 y (pH 7 & 9), 448 h (pH 4). Stable to light. Not decomposed after 14 d at 55 °C.

 

APPLICATIONS

Biochemistry:

Branched chain amino acid synthesis (ALS or AHAS) inhibitor.

Mode of action:

 Selective, systemic post-emergence herbicide, absorbed by foliage and roots. 

Uses:

Control of grasses, sedges and broad-leaved weeds, especially Echinochloa spp., in direct-seeded rice, at rates of 15-45 g/ha. Also used to stunt growth of weeds in non-crop situations. 

Phytoxicity:

Rice planted in different soil shows different degrees of pytotoxicity by bispyribac-sodium, and it causes less toxicity to rice off there is a thin layer of water above soil during spraying, while the phytotoxicity occurs heavily at high temperature. The phytotoxicity of bispyribac-sodium may be reduced by a safener.

Formulation types:

20%WG.