Abstract

X-ray diffraction structure determinations of HOAt and HOOBt, two well-known additives for peptide bond formation, are reported in conjunction with those of seven derivatives of HOBt, HOAt, and HOOBt, five of which originate from Nα-protected α-amino acids. In the crystal state the two additives are found in the 1-hydroxy tautomeric form. In contrast to six derivatives which crystallize as esters, one, Fmoc-(N)OBt, is observed in the isomeric amide-type (urethane) form.

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