Crystal and molecular structure of (E)-2-t-butyl-3(3′-t-butyldimethylsiloxy)propyl-2-cyanocyclobutanone

The title compound crystallizes in the monoclinic space group P2₁/a, with a+12.906(9). b+11.604(2). c+14.631(9) Å, β=108.70(3)° and Z+4. The structure was solved by direct methods from diffractometer data and refined to a final R value of 0.057 for 2020 independent reflections. The structure analysis confirms the cis disposition of the bulky substituents and indicates a puckered four-membered ring with a dihedral angle of 18.5° as expected for a non-centrosymmetrically substituted cyclobutanone.