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Reaction of N‐alkenyl‐o‐chloroanilines in toluene with tetrakis(triphenylphosphine)nickel (0) was carried out mainly to give indole and indoline derivatives in good yields. A detailed analysis of the reaction products has been done and it allows us to confirm the postulated mechanism of the cyclization reaction. Torsional hindrance around the NCCsp2 bond seems to prevent the cyclization reaction.
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Rodríguez et al. (1985) studied this question.
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