▼

Acetonitrile

Acetonitrile: The Versatile Nitrile Solvent | Chemca.in

Chemca.in

Nitrile Polar Aprotic HPLC Grade

Acetonitrile: The HPLC King and Synthetic Workhorse

Decoding the properties of CH3CN—from substitution reactions to analytical chromatography.

Nov 1, 2023 Chemca Editorial

Molecular Blueprint: CH3CN

Acetonitrile (Methyl Cyanide) is the simplest organic nitrile. Its structure is remarkably linear (C—C≡N), resulting in a high dipole moment. Unlike DMSO or DMF, it has low viscosity and is easier to remove.

  • Dielectric Constant: 37.5 (High Polarity)
  • Boiling Point: 81.6°C
  • Miscibility: Fully miscible with water.
CH₃ C N

Acetonitrile in Substitution Reactions

As a Polar Aprotic Solvent, Acetonitrile is a favorite for SN2 reactions. It has a specific advantage over DMSO and DMF:

Weak Coordination: MeCN is less basic than DMSO. While it still solvates cations effectively, it is less likely to interfere with sensitive metal catalysts. This makes it a "cleaner" environment for alkylations.

Safety Alert: Metabolism

Acetonitrile is deceptively dangerous. When absorbed through the skin, the body metabolizes it into Hydrogen Cyanide (HCN). Symptoms of toxicity are often delayed by several hours. Always work in a fume hood!

Mechanism Challenge

Why might a chemist choose Acetonitrile over DMSO for a reaction involving a metal catalyst?

Chemca.in

© 2026 Chemca.in Solvent Series.

``` ``` ```

1 comment:

  1. Anonymous16:19

    Your ability to make complex chemistry concepts accessible is truly inspiring. Thank you, Sir

    ReplyDelete