Hydrogen Bonds between Acidic Protons from Alkynes (C–H···O) and Amides (N–H···O) and Carbonyl Oxygen Atoms as Acceptor Partners

Figure 2

View along 𝑏 axis of the columnar polar staking of 1, which emphasizes the orientation of the amide, carbamate, and alkyne groups. Amide H bond interactions are represented with green dotted lines.