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The energies of hydrogen bonds formed in the crystalline state of thirteen amides and one amine have been estimated following the procedure proposed in a previous paper. The values of the energy of an NH···O bond can be estimated at about 4±1 kcal./mol. for the majority of compounds treated in this paper, except two lactams which show energy values as large as 6∼7 kcal./mol. A comparison was made between the energy values of NH···O and OH···O bonding using the data obtained by the author and other investigators.
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Ariyuki Aihara (1960) studied this question.
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