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Benzo pyrazole

The most important intramolecular C-coupling reaction is the synthesis of 4,5-benzo-pyrazoles, originally called indazoles (6.70), as shown in Scheme 6-47. The indazole synthesis was discovered by Witt et al. (1890). Nolting (1904) investigated which substituted 2-methylbenzenediazonium salts yield indazoles (review Behr, 1967). [Pg.137]

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Benzo pyrazoles

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