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(2R,3R)-1,4-Dioxaspiro[4.4]nonane-2,3-dicarboxylic and (2R, 3R)-1,4-dioxaspiro[4.5]decane-2,3-dicarboxylic acids

Ananyev I., Roitershtein D., Миняев М., Виноградов А., Нифантьев И.

The title compounds, C9H12O6 and C10H14O6, were formed by careful hydrolysis of the corresponding diethyl esters. Their single crystals were grown from an ethyl acetate/hexane mixture. Crystals of both compounds have monoclinic (P2(1)) symmetry with a single molecule in the asymmetric unit. Both crystal structures are very similar and display four -CO-OH center dot center dot center dot O=C(OH)-hydrogen bonds, forming a two-dimensional double-layered framework.