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Pyrrole and Its Derivatives

Some of the physical constants of pyrrole and of a selection of its derivatives are collected in Table 4.1. The boiling point of pyrrole is higher than might have been expected, and the closer similarity in this property of 1-methylpyrrole to, say, toluene suggests that in pyrrole the imino group is responsible for some sort of association (see below). The characterization of pyrrole and simple alkylpyrroles through the formation of crystalline derivatives is not always easy. Picrates are usually unstable. In cases where picric acid causes dimerization, the dimer picrate is often a satisfactory derivative13, 233. The reaction with phenyl isocyanate (p. 66) is useful.

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