Crucial Role of N···Si Interactions in the Solid-State Coloration of Disilylazobenzenes
摘要:
2.2'-Bis(fluorodiphensylsilyl)azobenzenes bearing two methyl and butyl groups at the 4- and 4'-positions were synthesized, and their X-ray crystallographic analyses revealed that they have tetracoordinated and pentacoordinated silicon atoms, respectively. Although the two compounds showed almost the same spectra in solution, the reflectance spectra of the solid revealed that the pentacoordinated state had a weaker absorbance in the long-wavelength region compared with that of the tetracoordinated state, which is ascribed to the shift of the n-pi* transition. This difference in the absorptions due to the n-pi* transition drastically affects the color of the azobenzenes: the color of the pentacoordinated state becomes apparently paler than that of the tetracoordinated state.
在这里,我们考虑了一系列以吲哚[1,2- c ]喹唑啉(IQ)为核心部分的对称稠合杂环芳烃(HAH)的合成和表征。通过使用各种光谱方法系统地研究了所有新的 HAH IQ 系列。此外,它们的光物理特性得到了密度泛函理论 (DFT) 和瞬态密度泛函理论 (TDDFT) 研究的支持,以支持实验结果。四甲基取代的吲哚[1,2- c ]喹唑啉(TMIQ)化合物显示出π - π的位移类型堆叠相互作用,使该系列成为一种新的半导体材料。TMIQ 的基于单晶的场效应晶体管器件表现出有效的电荷传输行为,p 沟道场效应迁移率为 0.25 cm 2 V -1 s -1,开/关比为 5 × 10 5。
Synthesis of benzimidazoles by Cu2O-catalyzed cascade reactions between o-haloaniline and amidine hydrochlorides
作者:Yanyang Qu、Lei Pan、Zhiqing Wu、Xiangge Zhou
DOI:10.1016/j.tet.2012.12.039
日期:2013.2
An efficient Cu2O-catalyzed method for the synthesis of benzimidazole derivatives from amidinehydrochlorides and o-haloaniline has been developed. The cascade C–N coupling and intramolecular transamination reaction provided benzimidazole derivatives in high yields up to 90%.
An efficientapproach to the synthesis of benzimidazole derivatives has been achieved by copper-catalyzed double C–N bonds formation of N-alkyl-2-iodoaniline and sodium azide. The reaction was supposed to proceed throughcopper-catalyzed tandem reaction of SNAr reaction, aerobic oxidation of C(sp3)–H bond and intramolecular C–N bond formation sequence. Structurally diverse 2-aryl, alkenyl and alkyl
Base‐Promoted Aerobic Oxidation/Homolytic Aromatic Substitution Cascade toward the Synthesis of Phenanthridines
作者:Debabrata Maiti、Atreyee Halder、Suman De Sarkar
DOI:10.1002/adsc.201900995
日期:2019.11.5
transition metal‐free synthesis of polysubstituted phenanthridines from abundant starting materials like benzhydrol and 2‐iodoaniline derivatives. The reaction involves sequential oxidation of alcohol and direct condensation reaction with the amine resulting in a C−N bond formation followed by a radical C−C coupling in a cascade sequence. The used base potassium tert‐butoxide plays a dual role in dehydrogenation
Cs<sub>2</sub>CO<sub>3</sub> as a source of carbonyl and ethereal oxygen in a Cu-catalysed cascade synthesis of benzofuran [3,2-c] quinolin-6[5-H]ones
作者:Wajid Ali、Anju Modi、Ahalya Behera、Prakash Ranjan Mohanta、Bhisma K. Patel
DOI:10.1039/c6ob01029f
日期:——
Simultaneous construction of C–C, C–O, and C–N bonds utilizing Cs2CO3 as a source of carbonyl (CO) and ethereal oxygen and a cascade synthesis of benzofuro[3,2-c]quinolin-6(5H)-one are achieved using a combination of Cu(OAc)2 and Ag2CO3.
with an indolo[1,2-c]quinazoline (IQ) as the core moiety. All the new HAHs IQ series were systematically investigated by using various spectroscopic methods. Furthermore, their photo-physical properties were supported by density functional theory (DFT) and time-dependent density functional theory (TDDFT) studies to support the experimental findings. The tetramethyl-substituted indolo[1,2-c]quinazoline
在这里,我们考虑了一系列以吲哚[1,2- c ]喹唑啉(IQ)为核心部分的对称稠合杂环芳烃(HAH)的合成和表征。通过使用各种光谱方法系统地研究了所有新的 HAH IQ 系列。此外,它们的光物理特性得到了密度泛函理论 (DFT) 和瞬态密度泛函理论 (TDDFT) 研究的支持,以支持实验结果。四甲基取代的吲哚[1,2- c ]喹唑啉(TMIQ)化合物显示出π - π的位移类型堆叠相互作用,使该系列成为一种新的半导体材料。TMIQ 的基于单晶的场效应晶体管器件表现出有效的电荷传输行为,p 沟道场效应迁移率为 0.25 cm 2 V -1 s -1,开/关比为 5 × 10 5。