Picoline

Picoline refers to three different methylpyridine isomers, all with the chemical formula C₆H₇N and a molar mass of 93.13 g mol⁻¹. All three are colourless liquids at room temperature and pressure.

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The three compounds are:

• 2-methylpyridine, α-picoline or ortho-picoline, CAS registry number [109-06-8]
• 3-methylpyridine, β-picoline or meta-picoline, CAS RN [108-99-6]
• 4-methylpyridine, γ-picoline or para-picoline, CAS RN [108-89-4]

The CAS number of an unspecified picoline isomer is [1333-41-1]