86344-20-9

Upstream product

• 86344-31-2 1,2-dinitro-4-(5'-trifluoromethyl-2'-pyridyloxy)benzene 
• 121-45-9 phosphorous acid trimethyl ester 

Relevant academic research and scientific papers

ORGANIC PHOSPHORUS COMPOUNDS 82. PREPARATION, PROPERTIES AND HERBICIDAL ACTIVITY OF 2-SUBSTITUTED 5-PHENOXY- AND 5-PYRIDYLOXY PHENYL PHOSPHONIC AND PHOSPHINIC ACID DERIVATIVES

In the Cadogan reaction of 1,2-dinitro-4-chlorobenzene with phosphites and phosphonites the 2-nitro group is substituted but in 1,2-dinitro-4-alkoxycarbonylbenzenes the 1-nitro group is replaced exclusively.Extension of the Cadogan reaction to 4-phenoxy and 4-pyridyloxy substituted 1,2-dinitrobenzenes produced mainly 5-phenoxy and 5-pyridyloxy substituted 2-nitrophenylphosphonates and -phosphinates some of which show high herbicidal and plant growth regulating activity. 4- and 6-phenoxy or pyridyloxy substituted 2-nitrophenylphosphonates are herbicidally inactive.The herbicidal activity decreases from the phenoxy-phenylphosphonates to -phosphinates to pyridyloxy-phenylphosphonates when the same substitution pattern is present.The methyl esters 3a, 4a and 5a are the most active compounds in all three series.

Derivatives of 2-nitro-4- or -5-pyridyloxyphenylphosphonic acid, the preparation thereof, the use thereof as herbicides and/or plant growth regulators

The invention relates to novel 2-nitro-4- or -5-pyridyloxyphenylphosphonic acid derivatives of the formula STR1 wherein X is halogen or trifluoromethyl, Y is hydrogen or halogen, one of the two substituents A and E is a phosphonate group STR2 wherein R is