The crystal structures of 9‐methyl‐, 9‐methoxycarbonyl‐, and 9‐methoxyanthracene have been solved by the SEARCH procedure and refined from partial three‐dimensional photographic data to acceptable agreement factors. The molecular shapes are briefly discussed. The packing arrangements of the first two compounds provide for antiparallel juxtaposition across inversion centres of nearest‐neighbour molecules (interplanar distances of 3.57 and 3.39 Å) and C(9) … C(10′) contacts of 3.87 and 3.68 Å. In the non‐centrosymmetric packing of 9‐methoxyanthracene the distances between meso‐carbons of nearest‐neighbour molecules are greater than 4.5 Å.
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G. Schmidt (1971) studied this question.
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