High-Pressure NMR Study of <i>cis</i>-1,<i>n</i>-Disubstituted[<i>n</i>]paracyclophanes. Effect of Increased Pressure on the Hindered Internal Rotation
effect of hydrostatic pressure on the rate of internalrotation of title compounds has been examined by the DNMR method. Quartz pressure-resisting NMR cells were used to realize the high-pressure experiments up to 390 (line shape measurements) and 450 MPa (chemical shift measurements). Application of hydrostatic pressure was found to accelerate the rotation of the benzene ring, while pressure-induced