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Unformatted text preview: Et 4. Show the precursors for the following reactions: O a. b. c. O d. O CO 2 Et from acyclic precursor from acyclic precursor O O O NH by cycloaddition one of the precursors must lack nitrogen 5. Show reasonable mechanisms for the reactions below: O COOEt O 1. NaOEt/EtOH 2. H + /H 2 O O O O OH HO-O O...
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