Non-planar aromatic compounds. Part 4: Fine tuning the degree of bend in the pyrene moiety of [7](2,7)pyrenophanes by modifying the nature of the bridge
作者:Graham J Bodwell、James J Fleming、David O Miller
DOI:10.1016/s0040-4020(01)00245-9
日期:2001.4
several mono-, di-, tri- and tetraoxa[7](2,7)pyrenophanes were calculated at the AM1 level of theory and the bend angle (θ) of the pyrene system was found to be affected by both the number and the position(s) of the oxygen atom(s). In varying the type of atom X at the 4 position, θ was predicted to decrease with the C–X bond length. Attempted synthesis of 1,4,7-trioxa[7](2,7)pyrenophane gave traces of the
在理论的AM1水平上计算了几种单,二,三和四氧杂[7](2,7)邻苯二酚的结构,发现the系统的弯曲角(θ)受数量的影响和氧原子的位置。通过改变4位原子X的类型,可预测θ随C–X键长而减小。尝试合成1,4,7-三氧杂[7](2,7)邻苯二甲环,可得到痕量的目标化合物,是其回收的前体混合物中的次要成分。1 H NMR证据支持这样的预测,即它比当前的记录保存者拥有更多的bent单元。可以在十个步骤中以11%的总收率轻松制备4-Oxa [7](2,7)邻苯二酚,其晶体学测定的弯曲角为102.9°。