ChemicalBook CAS DataBase List 109293-97-2

109293-97-2

Name	DIFLUFENZOPYR
CAS	109293-97-2
Molecular Formula	C15H12F2N4O3
MDL Number	MFCD03095702
Molecular Weight	334.28
MOL File	109293-97-2.mol

Chemical Properties

Melting point	155° (Bowe); also reported as 186° (Anderson).
density	0.24 g/cm3(Temp: 25 °C)
Fp	150 °C
storage temp.	0-6°C
pka	2.91±0.36(Predicted)
Merck	13,3169
CAS DataBase Reference	109293-97-2
EPA Substance Registry System	Diflufenzopyr (109293-97-2)

Safety Data

Symbol(GHS)	GHS09
Signal word	Warning
Hazard statements	H410
Precautionary statements	P273-P391-P501
RTECS	US5648931
Hazardous Substances Data	109293-97-2(Hazardous Substances Data)
Toxicity	LD50 in rats (mg/kg): >5000 orally; >5000 dermally; LC50 in rats (mg/l): 2.93 by inhalation; LC50 in rainbow trout, bluegill sunfish (mg/l): 106, 135 (Bowe). less more

Hazard Information

Chemical Properties

Flumioxazin pure is off-white odorless solid, melting point 135.5℃. Vapor pressure 1×10-7mPa(20/25℃). Partition coefficient Kow lgP=0.037(pH 7).Henry's constant <7×10-5Pa -m3/ mol(20℃). Relative density 0.24 (25°C). Solubility in water (25°C, mg/L): 63 (pH 5), 5850 (pH 7), 100546 (pH 9). Hydrolyzed DT50: 13d (pH 5), 24d (pH 7), 26d (pH 9). Aqueous photolysis of DT50: 7d (pH 5), 17d (pH 7), 13d (pH 9). pKa3.18.

Uses

Diflufenzopyr (SAN 835H) is an auxin transport inhibitor. Diflufenzopyr can enhance the activity of auxin herbicides, such as quinclorac (HY-B0871) and picloram (HY-B2034), and of the synthetic auxin, 1-naphthaleneacetic acid (HY-18570)[1][2].

Mechanism of action

Systemic, works by inhibiting auxin transport

Synthesis

Diflufenzopyr was prepared as follows: 5 ml of methanol solution containing 4-phenylaminourea (0.37 g, 2.4 mmol) was added to an aqueous solution of 2-acetylnicotinic acid (0.40 g, 2.4 mmol) in 7 ml of methanol, the mixture was stirred at room temperature

References

[1] Sikkema P H, et al. Biologically effective dose and selectivity of SAN 1269H (BAS 662H) for weed control in corn (Zea mays).[J]. Weed Technology, 1999, 13(2):283-289.
[2] Grossmann K, et al. On the mechanism of selectivity of the corn herbicide BAS 662H: a combination of the novel auxin transport inhibitor diflufenzopyr and the auxin herbicide dicamba. Pest Manag Sci. 2002 Oct;58(10):1002-14. DOI:10.1002/ps.549

Pesticide Type

Herbicide

Spectrum Detail

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