97634-16-7Relevant articles and documents
Stereomutation of conformational enantiomers of 9-isopropyl-9- formylfluorene and related acyl derivatives
Casarini, Daniele,Lunazzi, Lodovico,Mazzanti, Andrea
, p. 6382 - 6385 (2008)
(Figure Presented) Low-temperature NMR spectra show that the title compound exists as a pair of conformational enantiomers, generated by the restricted rotation about the C9-Pri bond, the corresponding interconversion barrier being 6.9 kcal mol-1. This interpretation is supported by theoretical (MM and DFT) calculations and by the experimental determination of the analogous barriers occurring in the related MeC=O and ButC=O derivatives.