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organic compounds
The pyranoid rings are in a half-boat conformation in compound (I), C13H14ClO6P, and in a deformed half-boat towards half-chair conformation in compound (II), C11H12ClO4P. Fusion with the pyranoid ring has no significant influence on the planarity of the benzene ring in either compound. In both structures the dimethoxyphosphoryl group is attached axially and the presence of the methoxycarbonyl substituent in (I) seems responsible for the disorder observed in the dimethoxyphosphoryl group.