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(a) Synthesis of 2H-indazoles 46 from o-nitrobenzaldimines 45 via 1,2,2,3,4,4-hexamethylphosphetane-mediated N-N bond formation (b) Synthesis of 2H-indazoles 46 from 2-nitrobenzaldehydes 47 and amines 48 by phospholene oxide with organosilanes-mediated N-N bond formation.
