Collidine is the trivial name

Trivial name

In chemistry, a trivial name is a common name or vernacular name; it is a non-systematic name or non-scientific name. That is, the name is not recognised according to the rules of any formal system of nomenclature...

 used to describe the chemical compound

Chemical compound

A chemical compound is a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions. Chemical compounds have a unique and defined chemical structure; they consist of a fixed ratio of atoms that are held together...

s trimethylpyridine

Pyridine

Pyridine is a basic heterocyclic organic compound with the chemical formula C5H5N. It is structurally related to benzene, with one C-H group replaced by a nitrogen atom...

. Their chemical properties resemble those of pyridine, although the presence of the methyl groups will prohibit some of the more straightforward reactions. Collidine comes in several isomers:

• 2,3,4-trimethylpyridine
• 2,3,5-trimethylpyridine
• 2,3,6-trimethylpyridine
• 2,4,5-trimethylpyridine
• 2,4,6-trimethylpyridine (the most common example of the isomers)
• 3,4,5-trimethylpyridine.

All isomers share the molecular weight 121.18 Da and the chemical formula C₈H₁₁N.