Throwing a curve: The first example of a through‐bond stereoelectronic effect for curved aromatic compounds is described for buckybowls, that is, benzylic‐substituted sumanenes. Methyl‐ and hydroxysumanene favor the endo‐R conformer because of a difference in the strength, between the conformers, of the hyperconjugation of the benzylic CH bond with the bowl.
Oxosumanenes were synthesized through benzylicoxidation. The electronic and redox properties were revealed to exhibit the expanded π-conjugation compared to sumanene. Single-crystal X-ray analysis of monooxosumanene showed columnar π-stacking in a concave–convex fashion. Stereoselective trimethylation of the trioxo derivative was performed via 1,2-addition to the carbonyl groups.
Time for tuning: Nitrogen‐doped graphitic carbon was synthesized from a bowl‐shaped π‐conjugated compound bearing an imine moiety; this bowl‐shaped compound underwent carbonization through laser annealing while almost retaining the nitrogen/carbon ratio.
Sumanenemonoone Imines Bridged by Redox-Active π-Conjugated Unit: Synthesis, Stepwise Coordination to Palladium(II), and Laser-Induced Formation of Nitrogen-Doped Graphitic Carbon
Sumanenemonooneimine compounds bridged by a redox‐active π‐conjugated unit on the basis of the conversion between 1,4‐phenylenediamine and 1,4‐benzoquinonediimine were synthesized and characterized. The stepwisecoordination of the imino groups to PdII in the sumanenemonooneimine compound bridged by 1,4‐benzoquinonediimine was indicated by the titration experiment. Laser irradiation of a film of
Bowl-shaped aromatic molecules, buckybowls, are attractive molecules because of the unique properties derived from their curved-π scaffolds. Doping heteroatoms into buckybowl frameworks is a powerful method to change their structural and electronical properties. Herein, we report the synthesis of C70 fragment buckybowl, homosumanene, and heterahomosumanenes having a lactone moiety and a lactam moiety
碗形的芳香分子,巴基碗,是有吸引力的分子,因为它们的弯曲-π 支架具有独特的性质。将杂原子掺杂到 buckybowl 框架中是改变其结构和电子特性的有效方法。在此,我们报告了 C 70的合成使用苏曼烯酮作为共同的中间体,通过三个扩环反应将具有内酯部分和内酰胺部分的巴基碗、高苏曼烯和杂异苏曼烯片段化。单晶的 X 射线衍射分析揭示了它们具有浅碗深度的柱状堆积结构。内酰胺部分很容易衍生得到氮杂高顺丁烯衍生物,即在外围碳上具有吡啶环的高顺丁烯烯的氮掺杂类似物。α-苯基氮杂高顺丁烯烯作为与铂的环金属化配体的合成应用也揭示了其在制备带有巴基碗配体的金属配合物方面的实用性。