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The crystal structures of the title compounds, C20H30O3 (I) and C16H22O3 (II), are described. The benzocyclobutene rings in (I) and (II) are approximately planar. The lengths of the Csp3-Csp3 bonds in the cyclobutene rings of (I) and (II) are 1.659 (2) and 1.596 (2) Å, respectively. The C-C bond elongation observed in (I) may be ascribed to steric congestion and/or electronic effects on the bond exerted by the methyl groups and the alkyl side chain attached to the cyclobutenol moiety, together with a ring strain expected for a four-membered ring system.

Supporting information

cif

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

hkl

Structure factor file (CIF format)
Contains datablock I

hkl

Structure factor file (CIF format)
Contains datablock II

CCDC references: 130774; 130775

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