Regiocontrolled halogen dance of 2,5-dibromopyrroles using equilibrium between dibromopyrrolyllithiums

18

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In the case of N-trisyl-2,3-dibromopyrrole 3g, the use of 3

mol% tribromopyrrole 6g did not promote isomerization of

3g' to 2g'.

The structures of compounds 7a and 8a were determined by

HMBC experiments.

The structures of compounds 7b and 8b were determined by

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