The System Pyridine-Pyrrole and the Association of Pyrrole

Abstract
Pyridine and pyrrole react together to form a 1:1 complex as shown by infrared, heat of reaction, viscosity, refractive index, and density data. The heat of formation of this complex is 3.8 kcal/mole. Pyrrole itself is associated, but, like the simple alcohols, cannot be represented by a simple equilibrium. The heat of dilution of pyrrole in CCl4 is 1.4 kcal/mole at infinite dilution.

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