1,6,7,10-Tetramethylfluoranthene: Synthesis and structure of a twisted polynuclear aromatic hydrocarbon.
作者:Allen Borchard、Kenneth Hardcastle、Peter Gantzel、Jay S. Siegella
DOI:10.1016/s0040-4039(00)60565-8
日期:1993.1
The structure and synthesis of the overcrowded polynuclear aromatic 1, 6, 7, 10-tetramethylfluoranthene, 1, is presented. The structures of 1 and 11 have been determined by X-ray diffraction to be twisted into conformations of approximately C2 symmetry due to the buttressing of the flanking methyl groups. Semi-empirical calculations (AM1) on 1 find two minima, twist and fold; the twist is of lower
过度拥挤的多核的结构和合成芳香族1,6,7,10-tetramethylfluoranthene,1,呈现。由于侧翼甲基的支撑,已经通过X射线衍射确定了1和11的结构被扭曲成大约C 2对称的构象。对1的半经验计算(AM1)找到两个极小值:扭曲和折叠。捻度较低。通过可变温度NMR将对映异构体1的能量设定为低于7.0kcal / mol。计算预测了解决色带扭曲的可能途径。