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The crystal structure of the title compound, C20H28O6, allows a firm assignment of the stereochemistry at C-4 of formation of the tetra­hydro­furan (THF) ring.

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The crystal structure of the title benzyl ether, C20H26O7, establishes the stereochemistry of the major diacetonide product from the Kiliani reaction of D-psicose. There are two independent mol­ecules in the cell related by a pseudo-twofold screw axis. There are no suitable donors for strong hydrogen bonds: the mol­ecules are simply in van der Waals contact.

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The ring size of both the lactone and the ketal protecting group in the title compound, C9H14O5, have been established by X-ray crystallographic analysis. The crystal structure consists of hydrogen-bonded spirals parallel to the b axis.
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