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121-45-9

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Identification

Name
Trimethyl phosphite
CAS
121-45-9
Synonyms
AURORA KA-1230
METHYL PHOSPHITE
PHOSPHOROUS ACID TRIMETHYL ESTER
TRIMETHYL PHOSPHITE
TRIMETHYL PHOSPHONATE
fosforyntrojmetylowy
Methyl phosphite ((MeO)3P)
P(OCH3)3
Phosphonousacidtrimethylester
Trimethoxyfosfin
Trimethoxyphosphine
Trimethyl ester of phosphorous acid
Trimethylfosfit
Trimethylphosphit
TRIMETHYL PHOSPHITE, 99.999+%
TRIMETHYL PHOSPHITE, 99+%
TRIMETHYL PHOSPHITE, 99+%, NMR GRADE
TrimethyPhosphite
Trimethylphosphite,97%
Phosphorigsuretrimethylester
EINECS(EC#)
204-471-5
Molecular Formula
C3H9O3P
MDL Number
MFCD00008350
Molecular Weight
124.08
MOL File
121-45-9.mol

Chemical Properties

Appearance
Trimethyl phosphite is a colorless liquid. Distinctive pungent, pyridine-like odor. The Odor Threshold is 0.0001 ppm.
mp 
−78 °C(lit.)

bp 
111-112 °C(lit.)

density 
1.052 g/mL at 25 °C(lit.)

vapor density 
4.3 (vs air)

vapor pressure 
17 mm Hg ( 20 °C)

refractive index 
n20/D 1.408(lit.)

Fp 
82 °F

storage temp. 
2-8°C

Sensitive 
Air & Moisture Sensitive
Uses
Chemical intermediate, especially for insecticides.
CAS DataBase Reference
121-45-9(CAS DataBase Reference)
NIST Chemistry Reference
Phosphorous acid, trimethyl ester(121-45-9)
EPA Substance Registry System
121-45-9(EPA Substance)

Safety Data

Hazard Codes 
Xn
Risk Statements 
R10:Flammable.
R22:Harmful if swallowed.
R36/37/38:Irritating to eyes, respiratory system and skin .
Safety Statements 
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
RIDADR 
UN 2329 3/PG 3

WGK Germany 
1

RTECS 
TH1400000


10-13-21
TSCA 
Yes
HazardClass 
3
PackingGroup 
III
HS Code 
29209011
Safety Profile
Moderately toxic by ingestion and skin contact. An experimental teratogen. A severe skin and eye irritant. Flammable liquid when exposed to heat, flame, or oxidizers. To fight fire, use water, foam, fog, CO2. Violent explosive reaction on contact with magnesium perchlorate or trimethyl platinum(IV) azide tetramer. When heated to decomposition it emits toxic fumes of POx. An intermediate in the production of pesticides, fire retardants, and organic phosphorus additives. See also ESTERS.
Hazardous Substances Data
121-45-9(Hazardous Substances Data)

Raw materials And Preparation Products

Hazard Information

General Description
A clear colorless liquid with a strong foul odor. Flash point 99°F. Denser than water and insoluble in water. Vapors heavier than air. Used to make other chemicals.
Reactivity Profile
As soon as TRIMETHYL PHOSPHITE(121-45-9) contacted a small amount of magnesium perchlorate in a flask, there was a flash and an explosion that shattered the flask (Allison 1968).
Air & Water Reactions
Highly flammable. Insoluble in water and denser than water. Slowly reacts with water to form phosphoric acid and corresponding organic alcohol.
Health Hazard
Symptoms of exposure may include burning sensation, coughing, wheezing, laryngitis, shortness of breath, headache, nausea, and vomiting.
Potential Exposure
Trimethyl phosphite is a flame retardant, and used as an intermediate in the manufacture of a number of pesticides, and organophosphorus additives.
First aid
If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 minutes, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, get medical attention. Give large quantities of water and induce vomiting. Do not make an unconscious person vomit. Medical observation is recommended for 24-48 hours after breathing overexposure, as pulmonary edema may be delayed. As first aid for pulmonary edema, a doctor or authorized paramedic may consider administering a drug or other inhalation therapy.
Fire Hazard
Special Hazards of Combustion Products: Toxic fumes of PO x
Shipping
UN2329 Trimethyl phosphite, Hazard Class: 3; Labels: 3-Flammable liquid.
Incompatibilities
Vaor May form explosive mixture with air. Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Violent reaction with magnesium perchlorate. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides. Reacts (hydrolyzes) with water. Incompatible with air, moisture.

Material Safety Data Sheet(MSDS)

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