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1,2-Ethane diimine (10–15); 2-amino imino-ketene (16); 1,2-diamino acetylene (17). For t, c, A and S codes, see Scheme 1. The heavy atoms are nearly or entirely coplanar. Remarkable deviations from planarity was found for structures (16) and (17). For detailed geometric data, see Supplementary Information (Table S1 and Figure S1a–d).
