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Ball Milling 100 Yields

A solid solid ball milling reaction of chalcone and phenylhydrazine catalyzed by NaHSO 4 H 2 O (0 5 equivalents) was reported by Zhu and coworkers The reaction proceeded effectively using a high speed ball mill at 1290 rpm to give 1 3 5 triaryl 2 pyrazoline in good yields (up to 93 ).

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