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Basic Information
CAS No.: 676-99-3
Name: METHYL PHOSPHONOTHIOIC DICHLORIDE
Article Data: 16
Molecular Structure:
Molecular Structure of 676-99-3 (METHYL PHOSPHONOTHIOIC DICHLORIDE)
Formula: CH3 F2 O P
Molecular Weight: 100.005
Synonyms: Phosphonicdifluoride, methyl- (6CI,7CI,8CI,9CI); Difluoromethylphosphine oxide; Methyldifluorophosphite; Methylphosphonic difluoride; Methylphosphonyldifluoride
Density: 1,384 g/cm3
Melting Point: -37oC
Boiling Point: 98-99°C
Risk Codes: R34; R36/37/38
Safety: Poison by inhalation and intravenous routes. When heated to decomposition it emits toxic fumes of POx and F−. See also FLUORIDES.
PSA: 26.88000
LogP: 1.74830
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Chemistry

The IUPAC name of Methylphosphonyl difluoride (CAS NO.676-99-3): Difluorophosphorylmethane
Synonyms: Difluoro ; Difluoromethylphosphine oxide ; Difluoromethylphosphineoxide ; Methyl difluorophosphite ; Methyldifluorophosphite ; Methylphosphonic difluoride ; Methylphosphonicaciddifluoride ; Methyl-phosphonicaciddifluoride
CAS: 676-99-3 
Molecular Weight: 100.004487 g/mol
Molecular Formula: CH3F2OP
Molecular Structure:

Index of Refraction: 1.276 
Density: 1.248 g/cm3 
Boiling Point: 55.4 °C at 760 mmHg

Toxicity Data With Reference

The toxicity of Methylphosphonyl difluoride (CAS NO.676-99-3):

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
dog LCLo inhalation 1842mg/m3/30M (1842mg/m3) SENSE ORGANS AND SPECIAL SENSES: OTHER: EYE

LUNGS, THORAX, OR RESPIRATION: CYANOSIS		 Toxicology and Applied Pharmacology. Vol. 15, Pg. 131, 1969.
dog LD50 intravenous 25800ug/kg (25.8mg/kg)   Interagency Collaborative Group on Environmental Carcinogenesis, National Cancer Institute, Memorandum, June 17, 1974Vol. 17JUN1974,
guinea pig LCLo inhalation 1600mg/m3 (1600mg/m3)   Toxicologist. Vol. 4, Pg. 22, 1984.
monkey LCLo inhalation 2608mg/m3/30M (2608mg/m3) SENSE ORGANS AND SPECIAL SENSES: OTHER CHANGES: OLFACTION

BEHAVIORAL: AGGRESSION

LUNGS, THORAX, OR RESPIRATION: DYSPNEA		 Toxicology and Applied Pharmacology. Vol. 15, Pg. 131, 1969.
monkey LD50 intravenous 26900ug/kg (26.9mg/kg)   Interagency Collaborative Group on Environmental Carcinogenesis, National Cancer Institute, Memorandum, June 17, 1974Vol. 17JUN1974,
mouse LCLo inhalation 1842mg/m3/30M (1842mg/m3) SENSE ORGANS AND SPECIAL SENSES: OTHER: EYE

BEHAVIORAL: MUSCLE WEAKNESS

BEHAVIORAL: ATAXIA		 Toxicology and Applied Pharmacology. Vol. 15, Pg. 131, 1969.
mouse LD50 intravenous 114mg/kg (114mg/kg)   Interagency Collaborative Group on Environmental Carcinogenesis, National Cancer Institute, Memorandum, June 17, 1974Vol. 17JUN1974,
rat LCLo inhalation 1842mg/m3/30M (1842mg/m3) SENSE ORGANS AND SPECIAL SENSES: OTHER: EYE

SKIN AND APPENDAGES (SKIN): "DERMATITIS, OTHER: AFTER SYSTEMIC EXPOSURE"

SKIN AND APPENDAGES (SKIN): HAIR: OTHER		 Toxicology and Applied Pharmacology. Vol. 15, Pg. 131, 1969.
rat LD50 intravenous 13700ug/kg (13.7mg/kg)   Interagency Collaborative Group on Environmental Carcinogenesis, National Cancer Institute, Memorandum, June 17, 1974Vol. 17JUN1974,

Consensus Reports

Reported in EPA TSCA Inventory.

Safety Profile

The Risk Statements Methylphosphonyl difluoride (CAS NO.676-99-3):
R34:Causes burns. R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements:S23:Do not breathe vapour. S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39:Wear suitable protective clothing, gloves and eye/face protection.
Poison by inhalation and intravenous routes. When heated to decomposition it emits toxic fumes of POx and F−. See also FLUORIDES.