The title compound [systematic name: fluoren-9-yl N-(1-carboxy-3-methylbutyl)carbamate], C21H23NO4, exhibits torsion angles that vary from the typical values found in other Fmoc-protected amino acids, viz. the orientations of the fluorene and carboxyl groups [C—O—C—C = 93.8 (2) and N—C—C=O = −23.6 (2)°]. The crystal structure exhibits two intermolecular hydrogen bonds (O—H⋯O and N—H⋯O) that link the molecules into two-dimensional sheets parallel to the ab plane.

This fluoren-9-yl N-(1-carboxy-3-methylbutyl)carbamate exhibits unique torsion angles and two intermolecular hydrogen bonds, linking molecules into two-dimensional sheets parallel to the ab plane.

Paper

N-(Fluoren-9-ylmethoxycarbonyl)-l-leucine

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