Scientific article
German

On the Use of N, N'-Dipyrrolylmethane in Heterocyclic Synthesis. Dipyrrolo [1,2c:2', 1'e]-2 H-imidazole and its Aromatic Anion

Published inHelvetica chimica acta, vol. 63, no. 5, p. 1190-1197
Publication date1980-07-09
Abstract

The pyrrolate ion (5) is shown to produce N, N′-dipyrrolyl methane (4) when reacted with dichloromethane under conditions of weak counter-ion association. 1-Azoniafulvene ion (13) is suggested to be the key intermediate in this reaction. N, N′-Dipyrrolyl methane (4) undergoes intramolecular oxidative coupling when treated with butyllithium and Cu(II)chloride, yielding the novel ring system of dipyrrolo [1,2c: 2′, 1′e]-2 H-imidazole (3). The latter upon reaction with methyl lithium forms the Hückel-aromatic anion 2. Solutions of the lithium salt are stable for several days. Reaction of the dianion of 2,2′-bipyrrole (11) with dichloro-methane does not produce 3, but a pyrrolophane-type dimer (12) having its two anticoplanar N, N′-bipyrrolediyl subunits arranged in a double layer and joined by a methylene group on each side.

Citation (ISO format)
BURGER, Ulrich, DREIER, Franziska. On the Use of N, N”-Dipyrrolylmethane in Heterocyclic Synthesis. Dipyrrolo [1,2c:2′, 1’e]-2 H-imidazole and its Aromatic Anion. In: Helvetica chimica acta, 1980, vol. 63, n° 5, p. 1190–1197. doi: 10.1002/hlca.19800630510
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Journal ISSN0018-019X
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