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Addition of azabicyclo[1.1.0]butyl lithium to aldehydes and ketones. a) Aggarwal's strain‐release semi‐pinacol rearrangement of azabicyclo[1.1.0]butane carbinols. b) Divergent reactivity in Aggarwal's Friedel‐Crafts‐type intramolecular spirocyclization reaction.
