39475-55-3

Upstream product

• 2402-79-1 2,3,5,6-tetrachloropyridine 
• 25108-36-5 potassium picolinate 
• 2524-04-1 diethyl phosphorochloridothioate 

Downstream Products

• 6515-38-4 3,5,6-trichloropyridin-2 ol 
• 2465-65-8 O,O'-diethyl thiophosphoric acid 
• 5598-15-2 chlopyrifos oxon 
• 762-04-9 phosphonic acid diethyl ester 

Relevant academic research and scientific papers

Chlorpyrifos production method

Provided is a chlorpyrifos production method. Trichloro-acetic chloride is used as a starting raw material, an intermediate 3,3,5,6-tetrachloro-4,5-dihydropyridine-2(3H)-ketone is synthesized throughaddition and cyclization reaction, and then chlorpyrifos is synthesized through alkaline hydrolysis, condensation reaction and one-pot process reaction. The 3,5,6-trichloropyridine-2-sodium phenolatefiltering link after alkaline hydrolysis reaction is omitted, the chlorpyrifos is synthesized through a one-pot process, and operation steps are simplified. A dual-solvent method is adopted for condensation reaction, hydrolysis of O,O-diethyl thiophosphoryl chloride and generation of sulfotep can be effectively inhibited, the content of the synthesized chlorpyrifos product is 97% or above, and thetotal yield is 83% or above. Produced wastewater is greatly decreased, the total wastewater discharging amount is reduced by about 50% compared with an existing process, and the chlorpyrifos production method is suitable for industrial production.

Investigation on the acylation of heterocyclic alcoholate anions with O,O-dialkyl phosphorochloridothioate in water solvent

The acylation of some heterocyclic alcoholate anions with O,O-dialkyl phosphorochloridothioate has been investigated. Higher yields and fewer byproducts were achieved in water at 50 °C by employing an effective phase-transfer catalyst (PTC) (benzyl triethylammonium chloride [BTEAC]), acylation catalyst (AC) (4-dimethylaminopyridine), and surfactant (sodium dodecyl sulfate), under weakly basic (pH 9.5～10) conditions. This reaction can also be applied to synthesize other insecticides with excellent yields.

Reinvestigation of phase-transfer-catalyzed chlorpyrifos synthesis

Production of chlorpyrifos via the phase-transfer-catalyzed reaction of 0,0-diethylphosphorochloridothioate and the sodium salt of 3,5,6- trichloropyridin-2-ol was reinvestigated. The formation of sulfotep (the major byproduct) and the yield are influence

Concentrates of organophosphorous insecticides

A low volatile organic compound co-solvent system is disclosed for preparing emulsion concentrates of low melting organophosphorous insecticides wherein the bioefficacy of the insecticide active is significantly enhanced. The co-solvent system comprises a water-soluble ethoxylated fatty acid/rosin acid-nonionic surfactant composition.

Fungicidal active compound combinations

The present application relates to new active compound combinations composed, on the one hand, of prior art compounds metaconazole, 5-[(4-chlorophenyl)methyl]-2,2-dimethyl-1-(1H-1,2,4-triazol-1-yl-methyl)cyclopentanol and imidacloprid, 1-[(6-chloro-3-pyridinyl)-methyl]-4,5-dihydro-N-nitro-1H-imidazole-2-amine, and, on the other hand, of other prior-art active compounds, the combinations being extremely suitable for the protection of wood products.

Anti-fouling compositions

An anti-fouling composition comprising a carrier, and a binder, the improvement which comprises an effective amount of at least one insecticide. The composition is applied to the surfaces of articles which come into contact with seawater or brackish water, especially wood. Other conventional anti-fouling agents may also be present.

Substituted arylazadioxacyclo alkene fungicides

The invention relates to novel substituted arylazadioxacycloalkenes, a plurality of processes for their preparation and to their use as fungicides.

Pesticidal composition containing a microencapsulated organo-phosphorus or carbamate in a pyrethroid dispersion

An insecticidal and/or acaricidal and/or nematicidal composition having a rapid efficacy and residual activity which comprises a mixture of a poorly water-soluble organophosphorus insecticide and/or acaricide and/or nematicide and/or a poorly water-soluble carbamate insecticide and/or acaricide which have been microencapsulated in water-insoluble polymer coatings with a dispersing agent used in forming a microcapsule part, with a poorly water-soluble pyrethroid insecticide and/or acaricide emulsified or suspended in water with the above-mentioned dispersing agent used in forming a flowable part.

Process for preparing phosphorothioates and phosphonoates in a three-phase system

The present invention is directed to the preparation of certain phosphorothioates and phosphonoates by means of a process which employs a three-phase system for the reaction of an alkali metal or alkaline earth metal phenate, pyridinate or pyrimidinate with a phosphorochloridothioate or phosphorochloridate under alkaline conditions and in the presence of tertiary amine and quarternary ammonium salt co-catalyst, but in the absence of both a hydrocarbon or chlorinated hydrocarbon solvent and a surfactant.

Macrocyclic plant acaricides

Compounds of the formula I STR1 in which either R is methyl and there is a double bond in the 9,10-position, or in which R is hydrogen and there is a single bond in the 9,10-position, are highly active against Acarina which damage plants.