Phthalide

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Chemical Identification | General Product Information | Physical & Safety Data

Chemical Identification

Common Name

Phthalide

中文通用名

四氯苯酞

IUPAC

4,5,6,7-tetrachlorophthalide

CAS

4,5,6,7-tetrachloro-1(3H)-isobenzofuranone

CAS No.

27355-22-2

Molecular Formula

C₈H₂Cl₄O₂

Molecular Structure

General Product Information

Category

Fungicides > Organochlorine fungicides

Activity

Fungicide

Premix

Dust, fine granule, wettable powder, suspension liquid. Premix Parters: MCPA; pendimethalin;

Physical & Safety Data

Physical Properties

Molecular weight:271.9; Physical form:Colourless crystals. Melting point:209-210 °C; Vapour pressure:3 ×10-3 mPa (23 °C); Partition coefficient(n-octanol and water):logP = 3.01; Solubility:In water 2.5 mg/l (25 °C). In acetone 8.3, benzene 16.8, dioxane 14.1, ethyl alcohol 1.1, tetrahydrofuran 19.3 (all in g/l, 25 °C).; Stability:Stable for 12 h at pH 2 (2.5 ppm aq. solution); in weak alkali, DT50 c. 10 d ( pH 6.8, 5-10 °C, 2.0 ppm aq. solution);

Toxicology

Oral:Acute oral LD₅₀ for rats and mice >10 000 mg/ kg. Percutaneous:Acute percutaneous LD₅₀ for rats and mice >10 000 mg/ kg; non-irritating to eyes and shaved skin of rabbits. Inhalation: LC₅₀ (4 h) for rats >4.1 g/m³. ADI:( JMPR) 0.004 mg/ kg b.w. [1999].

Environmental Profile

Ecotoxicology:
Algae: EC₅₀ (96 h) for Selenastrum capricornutum >1000 mg/l.Bees:Non-toxic to bees; LD₅₀ (contact) >0.4 mg/bee.Birds:No effect on hens fed 1.5 mg/ kg for 7 days, and for another 3 days at 15 mg/ kg.Daphnia: LC₅₀ (3 h) >40 ppm.Fish: LC₅₀ (48 h) for young carp >320 mg a.i. (as tech. or DP)/l, 135 mg a.i. (as 50% WP)/l.Worms: LC₅₀ (14 d) >2000 mg/ kg substrate.

Environmental fate:
Animals:In rats, principal metabolites are 2-hydroxymethyl-3,4,5,6-tetrachlorobenzoic acid and its oxidation products.Soil:Principal metabolites in soil are 2-hydroxymethyl-3,4,5,6-tetrachlorobenzoic acid and its oxidation products (K. Aoki et al., Jpn. Pestic. Inf., 1979, 36, 32).Plant:4,7-Dichlorophthalide and 4,6,7-trichlorophthalide are formed in rice. WATER SOLUBILITY: 2.49 ppm at 25°

Transport Information

Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)