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. Author manuscript; available in PMC: 2016 Nov 1.
Published in final edited form as: Org Lett. 2016 Jul 13;18(15):3614–3617. doi: 10.1021/acs.orglett.6b01655

Figure 1.

Figure 1

Interplay of hydrogen bonds and n→π* interactions with a single carbonyl group. The carbonyl group can accept a hydrogen bond (H), accept an n→π* interaction (A), or donate an n→π* interaction (D). HH,11 AH,10 and AA12 have been explored previously. HD is explored herein.