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The crystal structures of the title compounds, (±)-(3'a[alpha],3'b[alpha],-6'a[alpha],7'a[alpha])-, (I), and (±)-(3'a[alpha],3'b[beta],6'a[beta],7'a[alpha])-, (II), have been determined at 134 and 135 K, respectively. The pentaleno[2,1-b]furan group has an endo conformation in (I) and an exo conformation in (II). The axial C-C bond attached to the spiro center is about 0.02Å longer than the equatorial C-C bond.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks global, I, II

hkl

Structure factor file (CIF format)
Contains datablock I

hkl

Structure factor file (CIF format)
Contains datablock so206

CCDC references: 135875; 135876

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