6533b831fe1ef96bd129840c

RESEARCH PRODUCT

(2aRS,3RS,4aSR,6aRS,6bSR)-3-Hydroxy-2a,3,4a,6,6a,6b-hexahydro-1,4-dioxacyclopenta[cd]pentalen-2(5H)-one

subject

description

The mol­ecular structure of the title compound [enanti­omers (VIII) and (VIIIa)], C8H10O4, was determined in the course of our studies on the synthesis of cyclo­penta­[1,2-b]furan-4-one derivatives. Tricyclic (VIIIa) consists of a planar bridged lactone unit and the two other ring systems in the envelope conformation. It contains five chiral C atoms and was obtained as a racemic mixture. The X-ray analysis showed the compound to possess a half-acetal unit with an endo orientation of the half-acetal ether bridge with respect to the lactone unit.