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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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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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The mol­ecule of the title compound, C11H18ClN5O2, possesses an approximate mirror plane and both morpholine rings adopt chair conformations.

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The synthesis of the title compound, C9H6Cl2N4, and its crystal structure are reported in this paper. The crystal structure is stabilized by N—H...Cl and N—H...N hydrogen-bonding inter­actions.

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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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