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2-Propene-1-imine (1–4); 2-imino acetaldehyde (5–8); 2-amino ketene (9). Letters t and c stand for the s-trans and s-cis conformations, respectively, letters A and S stand for CCNH anti and syn orientations respectively. The heavy atoms are nearly or entirely coplanar. Remarkable deviation from planarity was found for structure (9). For detailed geometric data, see Supplementary Information (Table S1 and Figure S1a–d).
