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Bispyribac-sodium

Bispyribac-sodium structure

CAS No:
125401-92-5
Formula:
C19H18N4O8.Na
Chemical Name:
Bispyribac-sodium
Synonyms:
Benzoic acid,2,6-bis[(4,6-dimethoxy-2-pyrimidinyl)oxy]-,sodium salt (1:1);Benzoic acid,2,6-bis[(4,6-dimethoxy-2-pyrimidinyl)oxy]-,sodium salt;KIH 2023;Bispyribac-sodium;V 10029;Nominee;Regiment;Designee;Short-keep;Nominee 400SC;Adora;Nominee KZ
Categories:
Agrochemicals > Herbicides

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Bispyribac-sodium Basic Attributes

Molecular Weight：

452.35

Exact Mass：

452.094421

EC Number：

603-066-4

Characteristics

PSA：

147

XLogP3：

1.24910

Density：

1.379 g/cm3

Melting Point：

235-237 °C

Boiling Point：

686.4ºC at 760 mmHg

Flash Point：

368.9ºC

Water Solubility：

H2O: 73.3 g/l at 20 ºC

Storage Conditions：

0-6°C

Safety Information

Transport codes：

NONH for all modes of transport

hazard class code：

safety instructions：

RTECS Number：

DG4436200

Marks：

Precautionary statement(s)：

P305 + P351 + P338

Hazard Statements：

H319

Bispyribac-sodium Use and Manufacturing

Methods of Manufacturing

Using diethyl malonate and thiourea as starting materials, it is condensed in the presence of sodium methoxide to produce sodium 4, 6-dihydroxy-2-pyrimidine thiophenol, which is then methylated, chlorinated and methoxylated And a series of reactions such as oxidation to produce 4, 6-dimethoxy-2-methanesulfonyl pyrimidine, and finally, 4, 6-dimethoxy-2-methanesulfonyl pyrimidine and 2, 6-dihydroxybenzoic acid Under basic conditions, the reaction is bispyribac. The total yield of the six-step reaction is 41% and the content is 95%. Bispyribac can also be prepared by reacting 2, 6-dihydroxybenzoic acid with 2-methylsulfonyl-4, 6-dimethoxypyrimidine. However, this method requires the reaction to be carried out under anhydrous conditions, the use of flammable and difficult to store dangerous goods sodium hydride and the more expensive solvent tetrahydrofuran, the reaction yield is only 28%.

Uses

Herbicide