13C Dynamic NMR study of N-phenyl-9-triptycylamine (3) reveals that “gear rotation” and “isolated rotation” in 3 have almost the same free-energy barriers of ca. 10.8 kcal mol−1.
Static and Dynamic Stereochemistry of<i>N</i>-(9-Triptycyl)acetanilide
作者:Gaku Yamamoto、Fusako Nakajo、Yasuhiro Mazaki
DOI:10.1246/bcsj.74.1973
日期:2001.10
X-ray crystallography and dynamic NMR spectroscopy of the title compound revealed (1) pyramidality of the N atom, (2) strong preference for Z-configuration of the amide bond, and (3) very high (67.4 kJ mol−1) and very low (<< 35 kJ mol−1) energy barriers to “Ac-passing” and “Ph-passing”, respectively.
标题化合物的 X 射线晶体学和动态 NMR 光谱揭示了 (1) N 原子的金字塔形,(2) 强烈偏好酰胺键的 Z 构型,以及 (3) 非常高 (67.4 kJ mol-1) 和分别对“Ac-passing”和“Ph-passing”具有非常低的(<<35 kJ mol-1)能垒。