Mass spectra of 9H-xanthene and 9H-thioxanthene derivatives.

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Methyl 9H-xanthene-9-carboxyl­ate

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9-Meth­oxy-9-(2-meth­oxy­phen­yl)-9H-xanthene

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In the title compound, C(23)H(28)Br(2)S, the thioxanthene unit is twisted, showing a dihedral angle of 29.3 (5)° between the benzene rings. When projected along [001], the packing shows two types of channels. The crystal studied was a racemic twin.

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Methyl 7-meth­oxy-9-oxo-9H-xanthene-2-carboxyl­ate

The crystal structure of the title compound, C(16)H(12)O(5), is stabilized by C-H⋯O hydrogen bonds and C=O⋯π inter-actions; π-π inter-actions are also present. With respective average deviations from planarity of 0.003 (2) and 0.002 (1) Å, the xanthone and ester fragments are oriented at an angle of 2.8 (2)° with respect to each other. The mean planes of the xanthone skeleton lie either paralle...

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ژورنال

عنوان ژورنال: Chemical and Pharmaceutical Bulletin

سال: 1989

ISSN: 0009-2363,1347-5223

DOI: 10.1248/cpb.37.1074