N

Pol'

from sb o-phenylenediamine + aldehyde/DDQ

from PS/DVB-CHO + o-phenylenediamine/FeCl3/02 o

from sb aromatic aldehyde + o-phenylenediamine derivative/nitrobenzene

indazoles from sb a-arylazobenzhydryl ester + BF3 • Et20 [532]

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