Tri Methyl Ortho Formate

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Trimethyl Orthoformate

CAS Number:149‑73‑5

Chemical Formula: CH(OCH₃)₃

Product Introduction

A colorless, moisture-sensitive liquid with a pungent odor. The simplest orthoester, TMOF is widely used in organic synthesis for transforming aldehydes into acetals (and back again), as a methyl ether reagent, acylation agent, and dehydrating additive in coatings and nanoparticle prep.

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Key Properties

Property Value
Boiling Point ~101–102 °C
Melting Point ~–53 °C
Density @ 20 °C ~0.95–0.97 g/mL
Vapor Pressure ~23.5 mmHg @ 20 °C
Refractive Index ~1.379 n₂₀/D
Flash Point ~13 °C CC
Solubility Hydrolyzes in presence of water; miscible in ethers/alcohols
Log P ~0.2 (estimated)

Applications

  • Converts aldehydes to acetals (e.g., for protecting groups)
  • Methylating and acylating reagent in organic synthesis
  • Dehydrating additive in coatings and nanoparticle production

Safety & Handling

  • Highly flammable liquid & vapor (H225); vapors are heavier than air
  • Causes eye and respiratory irritation (H319, H335)
  • Use under inert atmosphere, store sealed < 30 °C – keep dry and away from ignition sources

Packing Options

  • Lab:100 mL–2 L glass bottles
  • Industry:25 kg drums, bulk containers

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