HEPTENOPHOS

Description

Heptenophos is a light brown liquid or crystalline mass. It is soluble in water (2.2 g/L at 20 ?C) and miscible with most organic solvents, except aliphatic hydrocarbons. Log Kow = 2.32. Heptenophos is hydrolyzed in acidic and alkaline media.

Chemical properties

Pale amber liquid; miscible in most organic solvents; soluble in xylene, acetone, and methanol.

The Uses of HEPTENOPHOS

Heptenophos is used to control sucking pests (primarily aphids) in a wide range of crops. It is also used as an ectoparasiticide to control ticks, lice, mites and fleas in farm animals and pets.

The Uses of HEPTENOPHOS

Insecticide.

The Uses of HEPTENOPHOS

Heptenophos is a pesticide used for fruits and vegetables.

Definition

A nonpersistent contact and systematic phosphate insecticide.

Hazard

Poison; moderately toxic.

Metabolic pathway

Metabolism of heptenophos in soils is by hydrolysis to 7-chloro-bicyclo[3.2.0]hept-2-en-6-one, further transformations of which involve microbially-mediated Baeyer-Villiger oxidations of the cyclobutanone moiety, ring opening of the resultant lactones, dechlorination and dehydrochlorination followed by ultimate mineralisation to CO2 and conversion to unextractable soil-bound residues. In rats, 7-chlorobicyclo[3.2.0]hept-2-en-6-one is further transformed to give the Favorskiirearranged product bicyclo[3.l.0]hex-2-en-6-exo-carboxylic acid as a urinary metabolite.

Metabolism

In rats 90% of heptenophos is excreted in the urine and 6% in the feces as water-soluble metabolites within 6 days after oral administration. In plant (lettuce), it is completely transformed to watersoluble metabolites without accumulation within 4 d. In soil, it is rapidly degraded bymicroorganisms, DT₅₀ (20 ?C) being less than 4 h.

Degradation

Heptenophos is hydrolysed in acidic and alkaline media (PM).

Toxicity evaluation

Acute oral LD₅₀ for rats is 96–121 mg/kg. Inhalation LC50 (4 h) for rats is 0.95 mg/L air. NOEL (2 yr) for rats is 15 mg/kg diet (0.75 mg/kg/d). ADI is 3 μg/kg b.w.