Barriers to rotation about the chiral axis of tertiary aromatic amides
作者:Anjum Ahmed、Ryan A. Bragg、Jonathan Clayden、Lai Wah Lai、Catherine McCarthy、Jennifer H. Pink、Neil Westlund、Samreen A. Yasin
DOI:10.1016/s0040-4020(98)00814-x
日期:1998.10
The barrier to rotation about the aryl-carbonyl bond in 40 tertiary aromatic amides was determined by variable temperature NMR spectroscopy (for rapid rotations) or by following the interconversion of atropisomers (for slower rotations). Empirical guidelines to the rate of ArCO bond rotation in hindered tertiary aromatic amides, and hence the stability of the atropisomeric stereoisomers of axially