Intermediates in the Synthesis of (+)-Grandisol. II

In the compound (1S,5S)-5-methyl-1-(phenylsulfonyl)bicyclo[3.2.0]heptan-2-one, C₁₄H₁₆O₃S, the cyclopentanone ring is in a twist conformation and the cyclobutane ring is puckered. The phenylsulfonyl and methyl groups are cis with respect to each other.

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