Kazuhiko Yamada, D. Hashizume, T. Shimizu
Jul 19, 2008
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Influential Citations
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Journal
Acta Crystallographica Section E: Structure Reports Online
Abstract
In the crystal structure of the title compound [systematic name fluoren-9-ylmethyl N-(1-carboxy-2-methylbutyl)carbamate], C21H23NO4, the molecular plane of the O=C—NH—Cα unit is slightly pyramidalized. The N atom deviates from the basal plane by 0.2086 (12) Å. The O=C—N—Cα torsion angle is −17.2 (2)°, and the C—N and O=C bond lengths are 1.3675 (17) and 1.2122 (17) Å, respectively. Apparently the character of the sp 2 hybrids of the molecular plane is, to some extent, reduced. The crystal structure exhibits two intermolecular hydrogen bonds (O—H⋯O and N—H⋯O), in which the hydroxy O atom acts as a donor to the carbonyl group and an acceptor of the amide group, respectively.