Improved Synthesis and Crystal Structure of 7<i>H</i>-Dibenz[<i>a</i>,<i>kl</i>]anthracen-7-one
作者:Shoji Fujisawa、Isao Oonishi、Junji Aoki、Yuji Ohashi、Yoshio Sasada
DOI:10.1246/bcsj.58.3356
日期:1985.11
An improved synthetic method gives pure 7H-dibenz[a,kl]anthracen-7-one, C21H12O, in a higher yield than those reported so far. The crystal structure has been determined by X-ray analysis. The space group is Pn21a, with unit cell dimensions of a=23.325(5), b=14.149(3), c=3.986(1) Å, and Z=4. The structure was solved by the direct method and refined by the block-diagonal least-squares method to an R value of 0.044. The molecule is greatly distorted from the planar conformation because of an intramolecular steric repulsion between the hydrogen atoms.
一种改进的合成方法在更高产率下得到了纯的7H-二苯并[a,kl]蒽-7-酮,分子式为C21H12O。该晶体结构已通过X射线分析确定,空间群为Pn21a,晶胞参数为a=23.325(5) Å,b=14.149(3) Å,c=3.986(1) Å,Z=4。结构通过直接法解析并通过块对角最小二乘法精修至R值为0.044。由于分子内氢原子间的空间排斥作用,该分子整体偏离了平面构型。