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The title compound, C12H12O2, lies across an inversion centre. The mol­ecular structure suggests that the meth­oxy groups in the 1- and 5-positions of the naphthalene moiety do not significantly distort the planar conformation of the ring system, which has a maximum deviation of 0.0025 (9) Å. In the crystal, mol­ecules pack in a herringbone arrangement in layers parallel to (100) and with chains propagating along [101] formed by very weak C—H...O inter­actions.

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X-ray crystallography firmly established the relative stereochemistry of the title compound, C16H20N2O3. The acetonide ring adopts an envelope conformation with one of the O atoms as the flap and the piperidine ring adopts a slightly twisted boat conformation. The absolute configuration was determined by use of D-ribose as the starting material. The compound exists as O—H...O hydrogen-bonded chains of mol­ecules running parallel to the b axis.
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