MP2 and DFT Calculations on Circulenes and an Attempt to Prepare the Second Lowest Benzolog, [4]Circulene
作者:Hilmar Christoph、Jörg Grunenberg、Henning Hopf、Ina Dix、Peter G. Jones、Martin Scholtissek、Günther Maier
DOI:10.1002/chem.200701837
日期:2008.6.20
from the corresponding tetramethyl derivative (8) and subjected to various dehalogenation reactions; all attempts to obtain [2.2]biphenylenophane (7) as a precursor for 2 by this route failed. Treatment of 14 with sodium sulfide furnished the thiaphanes 16 and 17, thermal and photochemical desulfurization of which also failed to provide 7. In a second approach [2.2]paracyclophane was converted to the
为了预测这些环状稠合芳族体系的应变能和拓扑结构,对n = 3至20的[n]环进行了MP2和DFT计算。为了合成[4]环(2),由相应的四甲基衍生物(8)制得1,5,7,8-四(溴甲基)联苯(14),并进行各种脱卤反应;通过该途径获得[2.2]联苯酚(7)作为2的前体的所有尝试均告失败。用硫化钠处理14提供了硫烷16和17,其热和光化学脱硫也未能提供7。在第二种方法中,[2.2]对环烷被转化为假双倍体二硫醇23,随后被桥连到硫烷上。参见图22和24。在800℃下的快速真空热解中,它们仅转化为菲(30)。将商品产品PARYLENE C脱氯化氢为四氢[4]环7的方法仅导致聚合。报告了中间体8、14、17、23、24、26和35的X射线结构。