The molecular structure of the anti-aging agent J147 [systematic name: (E)-N-(2,4-dimethylphenyl)-2,2,2-trifluoro-N′-(3-methoxybenzylidene)acetohydrazide], C18H17F3N2O2, has been determined at 150 K. The crystal structure corresponds to the minimum-energy conformation in the gas phase calculated by density functional theory (DFT). 15 other conformations have been calculated and compared with the minimum, denoted 1111. NMR spectroscopic data have been obtained and compared with those from Gauge Independent Atomic Orbital (GIAO) calculations. DFT calculations allow the reduction of the 16 possible rotamers to the four most stable (i.e.
1111, 1112, 1121 and 1222); in addition, the calculated barriers connecting these minima are low enough to permit their interconversion. Comparison of the NMR spectroscopic results, both experimental and calculated, point to the 1121 isomer being present in chloroform solution.
在 150 K 下测定了抗衰老剂 J147 [系统名称:(E)-N-(2,4-二甲基苯基)-2,2,2-三氟-N′-(3-甲氧基亚苄基)乙酰肼](C18H17F3N2O2)的分子结构。该晶体结构与密度泛函理论(DFT)计算的气相最小能构象一致。还计算出了其他 15 种构象,并与最小构象进行了比较。我们获得了核磁共振光谱数据,并将其与量规独立原子轨道 (GIAO) 计算结果进行了比较。通过 DFT 计算,可以将 16 种可能的旋转体还原为四种最稳定的旋转体(即
1111、1112、1121 和 1222);此外,连接这些最小值的计算壁垒足够低,允许它们相互转换。核磁共振光谱的实验结果和计算结果都表明,1121 异构体存在于氯仿溶液中。