Conformational communication between the Ar–CO and Ar–N axes in 2,2′-disubstituted benzanilides and their derivatives
作者:Jonathan Clayden、Lluís Vallverdú、Madeleine Helliwell
DOI:10.1039/b602912d
日期:——
detectable by NMR. For simple tertiary benzanilides carrying an ortho substituent on each ring, conformational control can be high (up to about 10:1) providing the substituents are large, indicating that the two axes are in conformational communication with one another. For more complex diamides, conformational communication breaks down, and mixtures of conformers are evident by NMR.
含有两个或多个潜在立体异构酰胺轴的苯甲酰苯胺以可通过NMR检测的构象体混合物形式存在于溶液中。对于在每个环上带有邻位取代基的简单叔苯甲酰苯胺,如果取代基较大,则构象控制可能很高(最高约10:1),这表明两个轴彼此构象连通。对于更复杂的二酰胺,其构象连通性会中断,并且通过NMR可以看到构象异构体的混合物。