POLYMERISATION OF INDOLE. PART 2. A NEW INDOLE TRIMER
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 comparitive studies with the trimers (3) and (4).