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Trimethyl borate

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Trimethyl borate Basic information
Trimethyl borate Chemical Properties
  • Melting point:-34 °C
  • Boiling point: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.)
  • Flash point:8 °F
  • storage temp. Flammables area
  • solubility Miscible with tetrahydrofuran, ether, isoporpylamine, hexane and methanol.
  • form Liquid
  • color Colorless
  • Specific Gravity0.915
  • Specific Gravity0.883
  • Water Solubility reacts
  • Sensitive Moisture Sensitive
  • Hydrolytic Sensitivity7: reacts slowly with moisture/water
  • Merck 14,9712
  • BRN 1697939
  • Stability:Stable. Incompatible with oxidizing agents. Decomposes slowly in the presence of moisture, rapidly in water. Flammable.
  • InChIKeyWRECIMRULFAWHA-UHFFFAOYSA-N
  • CAS DataBase Reference121-43-7(CAS DataBase Reference)
  • NIST Chemistry ReferenceBoric acid, trimethyl ester(121-43-7)
  • EPA Substance Registry SystemBoric acid (H3BO3), trimethyl ester (121-43-7)
Safety Information
MSDS
Trimethyl borate Usage And Synthesis
  • Chemical PropertiesWater-white liquid. Miscible with ether, methanol, hexane, tetrahydrofuran; decomposes in presence of water.
  • UsesAs 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.
  • DefinitionChEBI: A member of the class of borate esters obtained by the formal condensation of three equivalents of methanol with boric acid.
  • General DescriptionA water-white liquid. Denser than water. Flash point 80°F. Vapors heavier than air. Used as a solvent and fungicide for fruit.
  • Air & Water ReactionsHighly flammable. Rapidly decomposes in water.
  • Reactivity ProfileBorates, such as Trimethyl borate, 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.
  • Health HazardMay 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 HazardHIGHLY 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.
  • Safety ProfileModerately 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.
  • Purification MethodsCarefully 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.]
Trimethyl borate Preparation Products And Raw materials
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