ChemicalBook CAS DataBase List 23560-59-0

23560-59-0

Name	HEPTENOPHOS
CAS	23560-59-0
EINECS(EC#)	245-737-0
Molecular Formula	C9H12ClO4P
MDL Number	MFCD00055303
Molecular Weight	250.62
MOL File	23560-59-0.mol

Chemical Properties

Definition	A nonpersistent contact and systematic phosphate insecticide.
Appearance	Pale amber liquid; miscible in most organic solvents; soluble in xylene, acetone, and methanol.
Melting point	25°C
Boiling point	bp0.001 94-95°
density	d420 1.294
vapor pressure	6.5 x 10^-2 Pa (15 °C)
Fp	2 °C
storage temp.	APPROX 4°C
form	liquid
Water Solubility	2200 mg l^-1 (20 °C)
EPA Substance Registry System	Heptenophos (23560-59-0)

Safety Data

Hazard Codes	T,N,Xn,F
Risk Statements	25-50/53-52/53-36-20/21/22-11 less more
Safety Statements	23-28-37-45-60-61-36/37-26 less more
RIDADR	3018
WGK Germany	3
RTECS	TB8545000
HazardClass	6.1(b)
PackingGroup	III
HS Code	29199000
Toxicity	LD50 orally in rats: 96-117 mg/kg (Hewson) less more

Raw materials And Preparation Products

Hazard Information

Chemical Properties

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

Uses

Insecticide.

Hazard

Poison; moderately toxic.

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.

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.

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