Supplier Related Products Identification Chemical Properties Safety Data Raw materials And Preparation Products Hazard Information Material Safety Data Sheet(MSDS) Spectrum Detail Well-known Reagent Company Product Information
WebSite >  CAS DataBase List  > 121-43-7

121-43-7

Supplier Related Products Identification Chemical Properties Safety Data Raw materials And Preparation Products Hazard Information Material Safety Data Sheet(MSDS) Spectrum Detail Well-known Reagent Company Product Information

Product Image

Identification

Name
Trimethyl borate
CAS
121-43-7
Synonyms
BORIC ACID TRIMETHYL ESTER
BORON METHOXIDE
BORON TRIMETHOXIDE
METHYL BORATE
METHYL BORATE-11B
TRIMETHOXYBORANE
TRIMETHYL BORATE
TRIMETHYL BORATE-11B
B(OCH3)3
Borester O
borestero
Boric acid (H3BO3), trimethyl ester
boricacid(h3bo3),trimethylester
boricacidtrimethylester(63-65%inmethanol)
C3H9BO3
Methyl borate, (MeO)3 B
Trimethoxyborine
Trimethoxyboron
trimethyl
Trimethylester kyseliny borite
EINECS(EC#)
204-468-9
Molecular Formula
C3H9BO3
MDL Number
MFCD00008346
Molecular Weight
103.91
MOL File
121-43-7.mol

Chemical Properties

Appearance
liquid
Appearance
Water-white liquid. Miscible with ether, methanol, hexane, tetrahydrofuran; decomposes in presence of water.
mp 
-34 °C
Melting point 
-34 °C (lit.)
Boiling point 
68-69 °C (lit.)
bp 
68-69 °C(lit.)

density 
0.932 g/mL at 20 °C(lit.)

vapor density 
3.59 (vs air)

refractive index 
n20/D 1.358(lit.)

Fp 
8 °F

storage temp. 
Flammables area
solubility 
Miscible with tetrahydrofuran, ether, isoporpylamine, hexane and methanol.
form 
Liquid
color 
Colorless
Specific Gravity
0.883
Specific Gravity
0.915
Stability:
Stable. Incompatible with oxidizing agents. Decomposes slowly in the presence of moisture, rapidly in water. Flammable.
Water Solubility 
reacts
Sensitive 
Moisture Sensitive
Hydrolytic Sensitivity
7: reacts slowly with moisture/water
Merck 
14,9712
BRN 
1697939
InChIKey
WRECIMRULFAWHA-UHFFFAOYSA-N
CAS DataBase Reference
121-43-7(CAS DataBase Reference)
NIST Chemistry Reference
Boric acid, trimethyl ester(121-43-7)
EPA Substance Registry System
121-43-7(EPA Substance)

Safety Data

Hazard Codes 
Xn,F
Risk Statements 
R11:Highly Flammable.
R21:Harmful in contact with skin.
R23/25:Toxic by inhalation and if swallowed .
R36/37/38:Irritating to eyes, respiratory system and skin .
R10:Flammable.
Safety Statements 
S16:Keep away from sources of ignition-No smoking .
S27:Take off immediately all contaminated clothing .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S25:Avoid contact with eyes .
S23:Do not breathe gas/fumes/vapor/spray (appropriate wording to be specified by the manufacturer) .
S2:Keep out of the reach of children .
RIDADR 
UN 2416 3/PG 2

WGK Germany 
3

RTECS 
ED5600000


21
TSCA 
Yes
HazardClass 
3
PackingGroup 
II
HS Code 
29209085
Safety Profile
Moderately toxic by ingestion, skin contact, and intraperitoneal routes. An eye irritant. A very dangerous fire hazard when exposed to heat, flame, or oxidizers. Moderately explosive when exposed to flame. Will react with water or steam to produce toxic and flammable vapors. To fight fire, use dry chemical, CO2, spray, foam. When heated to decomposition it emits acrid smoke and irritating fumes. See also ESTERS and BORON COMPOUNDS.
Hazardous Substances Data
121-43-7(Hazardous Substances Data)
Toxicity
LD50 orally in rats: 6.14 ml/kg (Smyth)

Raw materials And Preparation Products

Hazard Information

General Description
A water-white liquid. Denser than water. Flash point 80°F. Vapors heavier than air. Used as a solvent and fungicide for fruit.
Reactivity Profile
Borates, such as TRIMETHYL BORATE(121-43-7), behave similarly to esters in that they react with acids to liberate heat along with alcohols and acids. Strong oxidizing acids may cause a vigorous reaction that is sufficiently exothermic to ignite the reaction products. Heat is also generated by the interaction of esters with caustic solutions. Flammable hydrogen is generated by mixing esters/borates with alkali metals and hydrides.
Air & Water Reactions
Highly flammable. Rapidly decomposes in water.
Health Hazard
May cause toxic effects if inhaled or absorbed through skin. Inhalation or contact with material may irritate or burn skin and eyes. Fire will produce irritating, corrosive and/or toxic gases. Vapors may cause dizziness or suffocation. Runoff from fire control or dilution water may cause pollution.
Fire Hazard
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.
Chemical Properties
Water-white liquid. Miscible with ether, methanol, hexane, tetrahydrofuran; decomposes in presence of water.
Uses
As solvent for waxes, resins, oils; catalyst in the manufacture of ketones; analysis of paint and varnish ingredients; as neutron detector gas in the presence of a scintillation counter; as a promoter of diborane reactions.
Definition
ChEBI: A member of the class of borate esters obtained by the formal condensation of three equivalents of methanol with boric acid.
Purification Methods
Carefully fractionate the borate through a gauze-packed column. Re-distil and collect it in weighed glass vials and seal them. Keep it away from moisture. It undergoes alkyl exchange with alcohols and forms azeotropes, e.g. with MeOH the azeotrope consists of 70% (MeO)3B and 30% MeOH with b 52-54o/760mm, d 0.87. [Charnley et al. J Chem Soc 2288 1952, Gerrard & Lappert Chem Ind (London) 53 1952, Schlesinger et al. J Am Chem Soc 75 213 1953.] It has also been dried with Na and then distilled. [Beilstein 1 IV 1269.]

Material Safety Data Sheet(MSDS)

Spectrum Detail

Well-known Reagent Company Product Information

SupplierMore