Treatment of indole (1) with toluene-p-sulphonic acid in benzene provided the 2,3′-indole trimer (4), a positional isomer of the well known 3,3′-indole trimer (3). The structure of the new trimer (4) was established by comparative studies with the trimers (3) and (4).
H. Ishii, K. Murakami, E. Sakurada (<em xmlns="http://www.rsc.org/schema/rscart38">née</em> Kawanabe), K. Hosoya and Y. Murakami, J. Chem. Soc., Perkin Trans. 1, 1988, 2377 DOI: 10.1039/P19880002377
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