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The title compound [systematic name: (2S)-1-(2-hydroxy-1-naphthyl­meth­yl)pyrrolidinio-2-carboxyl­ate], C16H17NO3, a derivative of L-proline, was synthesized via the Mannich reaction. The X-ray crystal analysis reveals that the pyrrolidine ring adopts an envelope conformation, with the flap C atom deviating by 0.631 (9) Å from the plane defined by the other four atoms.

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The formation of the title compound, (S)-2-ammonio-1-butanol (2R,3R)-tartrate, C4H12NO+·C4H5O6-, the (S)-2-amino-1-butanol mol­ecule is converted to a cationic form containing a positively charged amino group, and the tartaric acid mol­ecule to a mono- or half-ionized tartrate anion. The structure is stabilized by a three-dimensional network of hydrogen bonds.

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This paper reports the synthesis of the title compound, C7H8Cl2N4O, and its crystal structure. The mol­ecule possesses a mirror plane and the morpholine ring adopts a chair conformation.

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In the title structure, C14H10O5, the angle between the planes formed by the 2,4-di­hydroxy­benzoyl and o-benzoic acid moieties is 87.12 (4)°. In addition to an intramolecular O—H...O hydrogen bond, intermolecular O—H...O hydrogen bonds (H...O = 1.76 and 1.89 Å) connect mol­ecules to form a two-dimensional network parallel to (10\overline 1).

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In the title compound, C33H53NO2, the phenolic hydroxyl groups are sterically hindered by the adjacent tert-butyl groups.

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The title compound, C18H31NO, was prepared from 3,5-di-tert-butyl-4-hydroxy­benzaldehyde through an indirect reductive amination process. There are two mol­ecules in the asymmetric unit which are linked by an O—H...N hydrogen bond [O...N = 2.784 (4) Å]. This mol­ecule pair is, in turn, linked into a four-mol­ecule centrosymmetric cluster by a second inter­molecular O—H...N hydrogen bond [O...N = 2.852 (3) Å].
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