A simple two-step synthesis of triptycene di- and tetracarboxylic acids is reported. Diels-Alder reaction between dimethylanthracenes and appropriate arynes, generated in situ from anthranilic or dimethylanthranilic acid, afforded di- or tetramethyl-triptycenes in 41-69% yields. Subsequent oxidation of the methyl groups with potassium permanganate provided the corresponding triptycene carboxylic acids
(9,10-Dihydro-9,10-o-benzeno-2,6-anthrylene)di(phenylmethylene): a ground state quintet molecule
作者:Hideyuki Tukada、Kiyoshi Mutai
DOI:10.1039/c39910000035
日期:——
moieties in a rigid triptycene skeleton, is photochemically generated from the corresponding diazo compound at cryogenic temperature in an ESR cavity, and the ESR spectra is identified with a quintetgroundstate, with ZFS parameters, |D|/hc= 0.0665 and |E|/hc= 0.0043 cm–1, respectively.
由相应的重氮化合物在低温下在ESR腔中从相应的重氮化合物光化学生成标题分子,该分子在刚性的三萜烯骨架中具有两个二苯基亚甲基部分,并用五重态基态和ZFS参数| D |来确定ESR光谱。 / hc = 0.0665和| E | / hc = 0.0043 cm –1。