NMR spectroscopy of cyclopentane derivatives: I. Cyclopentane and cyclopentanone

The deuterium-decoupled 100 MHz p.m.r. ¹³C-satellite spectra for cyclopentanone-2, 2,5,5-d₄ (2)) and cyclopentane-1,1,2,2,3,3-d₆ (5) have been determined at several temperatures and the LAOCOON 3 derived spectral parameters related to molecular conformation. For 2, the data were found to be consistent with the half-chair conformation; for 5, the data were fitted to an unrestricted pseudorotation model.