The introduction of a substituent in the $position of the pyrrole ring in N-vinyl-Zarylpyrroles and -2-heteroarylpyrroles results in an increase in the dihedral angles between the planes of the pyrrole ring and the aryl (or heteroaryl) residue, and a decrease in the dihedral angle between the planes of the pyrrole ring and the vinyl group. Introduction of the substituent in the %position of the pyrrole ring has the opposite effect on these angles.For N-vinyl-2-(2'-furyl)pyrrole, some spectral data suggest the formation of a C-H -* 0 hydrogen bond between the a-hydrogen atom of the vinyl group and the oxygen atom of the fury1 ring. This is in accord with the results of quantum chemical calculations.
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