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Synthesis and spectral studies on some tetrahydrobenzoxanthen-11-ones: crystal and molecular structure of 9,9-dimethyl-12-(2-nitrophenyl)-8,9,10,12-tetrahydrobenzo[a]xanthen-11-oneAbstract A series of 12-aryl-8,9,10,12-tetrahydrobenzo[a]-xanthen-11-ones have been synthesized by the multicomponent reaction (MCR) of b-naphthol, aryl aldehydes, and dimedone by using BF 3 :OEt 2 as a catalyst. The derived compounds have been analyzed by IR, NMR (1D and 2D), and mass spectra. The single crystal X-ray structural analysis of 9,9-dimethyl-12-(2-nitrophenyl)-8,9,10,12-tetrahydrobenzo[a]-xanthen-11-one evidences the envelope conformation of the cyclohexane ring and the pyran ring tends to adopt flattened-boat conformation.

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