Question
first one is the net equation and second one is mechanism of first one.
in the second one, H-A comes from where?
(c) Conversion into amides o=U DCC + RNH, Dec + RNH2 ОН NHR
O=U H Ron + CgH11 ngent H C6H11 CGH11 R-NH2 co: Hw-Cohn RNH2 CGH11 L0
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Answer #1

pop +RNH2 DIC RAH Mechanism O Deprotonation of acfdfe pooten- RB 4 Go - pet godt Cleophilic attack by the carboxylate(m) Nucleophf|fc attack by RNH2 to conbonyl corrbon. RA RAH2 I proton transfer R- NO- Turufer I Leaving grup A Removal N- RThe HA not coming from outside it is just proton transfer step ,it show separate in question mechanism.

Check step iv in answer, it is clearly shown how proton is transfer from one Nitrogen to another Nitrogen.

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