13C NMR studies of conformational dynamics in 2,2,5,7,8-pentamethylchroman-6-ol derivatives in solution and the solid state
Abstract
Conformational preferences of ‡) were determined. The barrier is determined by the interplay of steric and electronic effects of substituents in the ester fragment. GIAO-CPHF MO calculations of shielding constants were performed for the conformations with the