a. HO CH₂CH₂NH2 DCC, HN- b. C. H3CO₂C + DCC is -N=C=N- could also H work n -CO₂CH3 Н n HO OH NCO CF3SO3 > 100 °C (to remove MeOH) + NH2CH2CH2NH2 OCN froend ANH CHỊCH, -NHCH,CH,NH- cat. n

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