作者:Goverdhan Mehta、P. V. V. S. Sarma、R. Uma、Sergey Pogodin、Shumal Cohen、Israel Agranat
DOI:10.1039/a900768g
日期:——
The molecular structure of 1,1â²-bi(acenaphthen-1-ylidene)-2,2â²-dione 1, a potential building-block for the synthesis of fullerene fragments, has been investigated by X-ray crystallography and semi-empirical (AM1 and PM3) calculations. There is a good agreement between the calculated and crystal structure which is essentially planar and has E-configuration. In the solid state, molecules of 1 pack in an interesting manner as corrugated sheets sustained by a network of CâH· · ·O hydrogen bonds and resulting in the formation of tetrameric loops. While steric factors limit the reactivity of the carbonyl groups in 1, the ene double bond of the ene-dione moiety present in it exhibits propensity toward [4 + 2]-cycloadditions to furnish novel and highly compressed polycycles 8â10.
通过 X 射线晶体学和半经验(AM1 和 PM3)计算,研究了 1,1â²-双(苊-1-亚基)-2,2â²-二酮 1 的分子结构。计算结果与晶体结构非常吻合,晶体结构基本上是平面的,具有 E 型构型。在固态下,1 的分子以一种有趣的方式堆积成波纹状薄片,由 CâHÂ-Â Â-Â-O 氢键网络支撑,并形成四聚环。虽然立体因素限制了 1 中羰基的反应活性,但其中烯二酮分子的烯双键却表现出[4Â +Â 2]-环加成反应的倾向,从而形成了新颖、高度压缩的多环 8â10。