Dimethyl-2,2'-bipyridine

Structure of 4,4'-dimethyl-2,2'-bipyridine.

Dimethyl-2,2'-bipyridine can refer to many isomers of 2,2'-bipyridine containing two methyl substituents. All have the formula (CH₃)₂C₁₀H₆N₂, but the most common are symmetrical derivatives (CH₃C₅H₃N)₂ listed below. These compounds are used as ligands in coordination chemistry and homogeneous catalysis. They are white or colorless. Most are solids except the 3,3' isomer which is a liquid.

Caption text

compound	Registry number	melting/boilingpoint (°C)
4,4'-dimethyl-2,2'-bipyridine	1134-35-6	171-172
5,5'-dimethyl-2,2'-bipyridine	1762-34-1	114.5-115
6,6'-dimethyl-2,2'-bipyridine	4411-80-7	89.5-90.5
3,3'-dimethyl-2,2'-bipyridine	1762-32-9	293-298[1]

References

1. Case, Francis H. (1946). "The Synthesis of Certain Substituted 2,2'-Bipyridyls¹". Journal of the American Chemical Society. 68 (12): 2574–2577. doi:10.1021/ja01216a045.