Ar-N2 BF4 OH 4а-d Ar NABF4 catalyst MEOH solvent Bre BF4 rt, 6 h 57% rt За 3b 1а-d

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Q: Ar-N2 BF4 OH 4а-d Ar NABF4 BF3 catalyst HO. MeOH solvent Br rt, 6 h rt BF4 За 3h 1а-d

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