C3H9O3P
124.08 g/mol
Industrial ChemicalDanger
TRIMETHYL PHOSPHITE
CAS121-45-9EC204-471-5
Category
Industrial Chemical
Compound Class
Ester
Primary Use
Intermediate in pesticide manufacture
Trimethyl phosphite is a clear colorless liquid with a strong foul odor. It is denser than water, insoluble in water, and its vapors are heavier than air.
Intermediate in pesticide manufactureFireproofing agent in textile productionIntermediate in flame-retardant polymers for polyurethane foams
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
Controlled substances
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CAS 121-45-9
Related Compounds
ReferenceSame Category
Sulfanilic acid
CAS121-57-3
Intermediate for dyes and organic chemicals
ReferenceSame Category
M-nitrobenzoyl chloride
CAS121-90-4
intermediate for dyes and pharmaceuticals
ReferenceSame Category
Isophthalic acid
CAS121-91-5
intermediate for polymers and resins
ReferenceSame Category
[4-(Octyloxy)phenyl]phenyl-iodonium
CAS121239-74-5
photoinitiator for polymerization reactions
Safety Reference
Danger
H226Flammable liquid and vapour
H302Harmful if swallowed
H312Harmful in contact with skin
H315Causes skin irritation
H318Causes serious eye damage
H319Causes serious eye irritation
H332Harmful if inhaled
H335May cause respiratory irritation
H361Suspected of damaging fertility or the unborn child
H360May damage fertility or the unborn child
H373May cause damage to organs through prolonged or repeated exposure
H402Harmful to aquatic life
H412Harmful to aquatic life with long lasting effects
H303May be harmful if swallowed
H313May be harmful in contact with skin
Customs Tariff Classification
The international HS code for TRIMETHYL PHOSPHITE (CAS 121-45-9) is 2920.23.
HS code (international, 6-digit)
2920.23
EU CN code (8-digit)
2920 23 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
trimethyl phosphite
InChIKey
CYTQBVOFDCPGCX-UHFFFAOYSA-N
SMILES
COP(OC)OC
Synonyms (20)
- Fosforyn trojmetylowy
- Fosforyn trojmetylowy [Czech]
- Methyl phosphite
- Methyl phosphite ((MeO)3P)
- P(OMe)3
- TMPhite
- TRIMETHYL PHOSPHITE
- Trimethoxyfosfin
- Trimethoxyfosfin [Czech]
- Trimethoxyphosphine
- Trimethylfosfit
- Trimethylfosfit [Czech]
- Trimethylphosphit
- trimethoxyphosphane