Description

Trimethyl Borate (CAS 121-43-7) is a high-purity organoboron compound with the molecular formula C₃H₉BO₃. This colorless, flammable liquid is widely used as a reagent in organic synthesis, particularly in the production of boron-containing materials. With a boiling point of 68-69°C and a melting point of -34°C, it offers excellent solubility in common organic solvents such as methanol, ethanol, and ether.

Our premium grade Trimethyl Borate is available in multiple purity levels ranging from ≥98% to 99.999% (trace metal basis), meeting the stringent requirements of research and industrial applications. The product is packaged under inert gas to ensure stability and prevent moisture absorption. Key applications include use as a precursor for borate esters, crosslinking agent, and catalyst in polymer chemistry.

Key Specifications:
• Molecular Weight: 103.91 g/mol
• Density: 0.915 g/mL at 25°C
• Refractive Index: n²⁰_D 1.357
• Flash Point: -9°C (closed cup)
• UN Number: UN2416 (Flammable Liquid)
• Storage: Store under nitrogen at 2-8°C

Properties

• CAS Number: 121-43-7
• Complexity: 31.7
• IUPAC Name: trimethyl borate
• InChI: InChI=1S/C3H9BO3/c1-5-4(6-2)7-3/h1-3H3
• InChI Key: WRECIMRULFAWHA-UHFFFAOYSA-N
• LogP: -1.9
• Exact Mass: 104.0644743
• Molecular Formula: C3H9BO3
• Molecular Weight: 103.92
• SMILES: B(OC)(OC)OC
• Topological: 27.7
• Monoisotopic Mass: 104.0644743
• Physical Description: Trimethyl borate appears as a water-white liquid. Denser than water. Vapors heavier than air. Used as a solvent and fungicide for fruit.
• Color/Form: Colorless, moisture-sensitive liquid; fumes in air
• Boiling Point: 67.5 °C
• Melting Point: -29.3 °C
• Flash Point: less than 80 °F
• Solubility: Miscible with tetrahydrofuran, ether, isoporpylamine, hexane, methanol, nujol, and other organic liquids
• Density: 0.915 g/cu cm
• Vapor Density: 3.59
• Vapor Pressure: 137.0 [mmHg]
• Stability/Shelf Life: Stable in the absence of moisture.
• Refractive Index: Index of refraction: 1.3568 at 20 °C/D
• Synonyms: TRIMETHYL BORATE, Trimethoxyborane, Methyl borate, trimethylborate, Trimethoxyboron, Boric acid trimethyl ester, Boric acid, trimethyl ester, Trimethoxyborine, Borester O, Boric acid (H3BO3), trimethyl ester, B(OCH3)3, (MeO)3B, B(OMe)3, NSC 777, Trimethylester kyseliny borite, Trimethylborat, HSDB 5589, EINECS 204-468-9, UN2416, Trimethylester kyseliny borite [Czech], UNII-82U64J6F5N, BRN 1697939, Borsaeuretrimethylester, AI3-60245, NSC-777, 82U64J6F5N, Methyl borate, ((MeO)3B), TRIMETHYL BORATE [MI], TRIMETHYL BORATE [HSDB], DTXSID0037738, CHEBI:38913, EC 204-468-9, 4-01-00-01269 (Beilstein Handbook Reference), UN 2416, boric acid (H_3_BO_3_), trimethyl ester, boron trimethoxide, DTXCID8017738, METHYL BORATE ((MEO)3B), 204-468-9, 934-685-0, inchi=1/c3h9bo3/c1-5-4(6-2)7-3/h1-3h, wrecimrulfawha-uhfffaoysa-n, 121-43-7, 3349-42-6, MFCD00008346, 63156-11-6, Trimethyl borate-11B, trimethoxyboran, trimethyborate, trimethy borate, Urea,N-(cyclohexylmethyl)-N’-cyclopentyl-, trimethoxy boron, trimethyl-borate, trimethoxy borane, trimethylboric acid, trimethyl boric acid, trimethyl orthoborate, 1212-43-7, BORON METHOXIDE, Methyl borate, (MeO)3 B, Trimethyl borate, >=98%, SCHEMBL15840, NSC777, WLN: 1OBO1 & O1, STL264209, AKOS000121036, AT28213, DB-041618, DB-309472, Trimethyl borate, purum, >=99.0% (GC), B0226, B0522, NS00003606, Trimethyl borate, azeotrope, 70%, in methanol, Trimethyl borate [UN2416] [Flammable liquid], Trimethyl borate, 99.999% (trace metal basis), A804732, Q423710, Trimethyl borate-11B, 99 atom % 11B, 98% (CP), F0001-0343, Trimethyl borate, purified by redistillation, >=99.5%

Trimethyl borate serves as a versatile reagent in organic synthesis for producing boron-doped materials and as a crosslinking agent in polymer chemistry. It acts as a precursor for synthesizing specialty borate esters used in flame retardants and ceramic glazes. The compound finds particular utility in Suzuki-Miyaura coupling reactions and as a catalyst in transesterification processes.

Safety and Hazards

GHS Hazard Statements

• H360: May damage fertility or the unborn child [Danger Reproductive toxicity]

Precautionary Statements

• P203, P280, P318, P405, and P501

Hazard Classes and Categories

• Flam. Liq. 2 (40.5%)
• Flam. Liq. 3 (59.5%)
• Acute Tox. 3 (14.9%)
• Acute Tox. 3 (14.6%)
• Acute Tox. 4 (85.4%)
• Eye Irrit. 2 (30.3%)
• Acute Tox. 3 (14.6%)
• Repr. 1B (11%)
• Repr. 1B (19.3%)
• STOT SE 1 (19.8%)

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Disclaimer: Sold exclusively for laboratory research. Prohibited for commercial use, diagnostics, or human/animal applications. Buyers assume all compliance liability.