bonding. The conformational analysis of the s - transoid 2a and 2b was performed by molecular mechanic, and showed the occurrence of one minimum for each molecule. Moreover RM1 semi-empirical and DFT/B3LYP calculations were applied to investigate the conformational preferences of the trans -1-acetyl-4,5-di- tert -butyl-2-imidazolidinone 2 and to correlate between calculated conformations and the structure
摘要 反式-1-乙酰基-4,5-二叔丁基-
2-咪唑烷酮 2 [C 13 H 24 N 2 O 2 : MF = 240.34, 单斜晶系, P2 1 /c (# 14) , a = 12.313(4) A , b = 15.090(2) A, c = 16.246(2) A, β = 98.33(1)°, V = 2986.8(9) A 3 , Z = 8, D 计算= 1.069 g/cm 3 , μ (Cu-Kα) = 5.74 cm -1 , F 000 = 1056.00, T = 25.0 °C, R = 0.040] 被确定,并证实了 s - transoid 2a 的两个分子的出现和 2b 由两个氢键连接在一起。晶体内聚力由分子间氢键网络确保。s-transoid 2a 和 2b 的构象分析是通过分子力学进行的,并显示每个分子出现一个最小值。此外,应用 RM1 半经验和 DFT/B3LYP