Draw a curved-arrow mechanism for each of the reactions given in Fig. P27.77. (a) (b) (c) (d)

Draw a curved-arrow mechanism for each of the reactions given in Fig. P27.77.

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(a) (b) (c) (d) CH=O CH=0 o-phthalaldehyde CH 0 I CH₂Cl + NH3 + Na+ SH + acetone H + H₂N-CH-CO2 + HSCH₂CH₂OH CH3 Figure P27.77 CH₂CHNH3 CO₂ + H₂C=O PhCH,O–C−NH–CH-C—N3 CH₂OH pH 6.5 heat S CH3 N CH₂ N–CH–COF T CH3 fluorescent; used to detect amino acids + H₂O CO₂ NH₂ PhCH,O–C−NH SCH₂CH₂OH 1) HCN 2) HCI/H₂O 3) dil. NaOH N H + N₂ cysteine acetone