Fig. 5: Synthetic transformations and X-ray crystallography data of products.

Reaction conditions: a 2,4-dinitrophenylhydrazine (1.2 equiv.), 1 M HCl (1.0 equiv.), MeOH (0.1 M), r.t. b NaBH4, MeOH (0.5 M), r.t., 2 h.
Reaction conditions: a 2,4-dinitrophenylhydrazine (1.2 equiv.), 1 M HCl (1.0 equiv.), MeOH (0.1 M), r.t. b NaBH4, MeOH (0.5 M), r.t., 2 h.