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Collidine is the trivial name used to describe the chemical compounds which are trimethyl derivatives of pyridine. Their chemical properties resemble those of pyridine, although the presence of the methyl groups may prohibit some of the more straightforward reactions. Collidine comes in several isomers:

• 2,3,4-Collidine (2,3,4-trimethylpyridine)
• 2,3,5-Collidine (2,3,5-trimethylpyridine)
• 2,3,6-Collidine (2,3,6-trimethylpyridine)
• 2,4,5-Collidine (2,4,5-trimethylpyridine)
• 2,4,6-Collidine (2,4,6-trimethylpyridine)
• 3,4,5-Collidine (3,4,5-trimethylpyridine)

Collidines
Name	2,3,4-Collidine	2,3,5-Collidine	2,3,6-Collidine	2,4,5-Collidine	2,4,6-Collidine	3,4,5-Collidine
Systematic Name	2,3,4-Trimethylpyridine	2,3,5-Trimethylpyridine	2,3,6-Trimethylpyridine	2,4,5-Trimethylpyridine	2,4,6-Trimethylpyridine	3,4,5-Trimethylpyridine
Structural formula
CAS Registry Number	2233-29-6	695-98-7	1462-84-6	1122-39-0	108-75-8	20579-43-5

All isomers share the molecular weight 121.18 g/mol and the chemical formula C₈H₁₁N.

• Set index articles on chemistry
• Pyridines
• Amines
• Amine solvents