Synthesis of 2,3,6,7-Tetramethylnaphthalene from 2,3-Dimethylsuccinic Anhydride and<i>o</i>-Xylene
作者:Yasuhiko Dozen、Masato Hatta
DOI:10.1246/bcsj.48.2842
日期:1975.10
2,3,6,7-Tetramethylnaphthalene (7b) was prepared from 2,3-dimethylsuccinic anhydride (1) and o-xylene in five steps, and the configurations of their intermediates were studied. The higher-melting isomer (threo form) of 1 gave higher-melting products in each step, while the lower-melting isomer (erythro form) of 1 gave lowermelting ones. The configurations of the intermediates were confirmed by the
“Fullerene fragments:” Synthesis and crystal structure determination of 1,4,5,6,7,10,11,12-octamethylindeno[1,2,3-cd]fluoranthene
作者:Andrzej Sygula、Frank R. Fronczek、Peter W. Rabideau
DOI:10.1016/s0040-4039(97)01135-0
日期:1997.7
The title C30H28 hydrocarbon, a potential precursor for the synthesis of buckybowls and carbon cages, is synthesized from 2,3,6,7-tetramethylnaphthalene in eight steps. X-ray crystalstructuredetermination shows a significant distortion of its molecular framework due to steric hindrance of the attached methyl groups. The twisted conformation, present in the solid state, is also predicted to be preferred
由2,3,6,7-四甲基萘分八步合成标题为C 30 H 28的碳氢化合物,它是合成巴克杯和碳笼的潜在前体。X射线晶体结构测定表明,由于所连接的甲基的空间位阻,其分子骨架发生了明显的变形。根据半经验AM1计算,还预测存在于固态的扭曲构象在气相中是优选的。
The Question of Aromaticity in Open-Shell Cations and Anions as Ion-Radical Offsprings of Polycyclic Aromatic and Antiaromatic Hydrocarbons
作者:Sergiy V. Rosokha、Jay K. Kochi
DOI:10.1021/jo061695a
日期:2006.12.1
with 4n+2-electrons and antiaromatic analogues with 4n-electrons, we can now address the question of π-delocalization in these odd-electron counterparts. Application of the structure-based “harmonic oscillator model of aromaticity” or the HOMA method leads to the surprising conclusion that the aromaticity of these rather reactive, kinetically unstable arene cation and anion radicals (as measured by
Further Studies of the Thermal and Photochemical Diels−Alder Reactions of <i>N</i>-Methyl-1,2,4-triazoline-3,5-dione (MeTAD) with Naphthalene and Some Substituted Naphthalenes
作者:Gary W. Breton、Kristy A. Newton
DOI:10.1021/jo9906429
日期:2000.5.1
MeTAD thermally reacted with naphthalene (2) and methylated naphthalenes to give equilibrium mixtures of starting materials and [4 + 2] cycloadducts. Methyl substitution on the naphthalene ring generally increased both the amount of cycloadduct formed and the rate of cycloaddition relative to 2. The isolated cycloadducts were all thermally labile and quantitatively reverted to the parent naphthalene
The title compounds have been prepared with a view of developing newelectrondonors for low-dimensional molecular complexes. They have increasing donor character in order of the chalcogen triad, i.e., S, Se, Te, and all form semi-conductive complexes with TCNQ.