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JOURNAL OF HETEROCYCLIC CHEMISTRY · 2022 ·Vol. 59 ·期 9 ·1561-1572 · IF 2.035

Catalyst-free one-pot three-component rapid synthesis of polysubstituted pyrroles by liquid-assisted grinding

Ling Jiang,Si-Yu Yan,Jing-Wen Dong,Li-Dan Ye,Yue Cheng,Xiao-He Chu

A series of polysubstituted pyrroles were rapidly synthesized in moderate to good yields via catalyst-free one-pot three-component reaction of 1,3-dicarbonyl compounds with primary amines and nitrostyrenes by using liquid-assisted grinding. This protocol provides several advantages over the conventional chemical synthesis, such as simple work-up procedure, wide substrate scope, short reaction time, and environmental friendliness. Structures of polysubstituted pyrroles were confirmed by 1 H NMR, 13 C NMR, and ESI-MS studies.

研究领域: 有机化学 · 药物化学 · 绿色化学 · 合成方法学 · 杂环化学

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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES · 2020 ·Vol. 36 ·期 5 ·816-820 · IF 1.063

Catalyst-free 2+2 Photodimerization of 1,4-Bis[2-(4-pyridyl)ethenyl]-benzene in Solution Under Low Power UV Irradiation

Chu Ning,Xu Shuping,Xu Weiqing

Two different kinds of configurations of 1,4-bis[2-(4-pyridyl)ethenyl]-benzene( trans -bpeb and cis -bpeb) were achieved, and a bpeb dimer was synthesized in dimethyl sulfoxide(DMSO). Compared with the previous work that synthesized the bpeb dimer or polymer in crystal with a template agent needed, the reaction occurred in a solution phase in the present method. A hand-held ultraviolet lamp(365 nm) with the power of 12 W and the Watt density of 0.35 mW/cm 2 can realize the photodimerization of bpeb, instead of the high-power mercury lamp in most previous studies. Unlike other 2+2 cycloaddition in liquid state using catalysts even noble metals, no catalysts were required here, which is cost-saving. Only the trans -pbeb can start the cycloaddition and the formation of the close J-aggregations of trans -pbeb in DMSO is a precondition for explaining the 2+2 photodimerization. The productivity for the 2+2 cycloaddition product was achieved as 55.6%.

研究领域: 有机化学 · 光化学 · 超分子化学 · 材料化学 · 合成方法学

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Physica Status Solidi-Rapid Research Letters · 2019 ·Vol. 13 ·期 7 ·1900063 · IF 3.729

CVD Grown MoS2 Nanoribbons on MoS2 Covered Sapphire(0001) Without Catalysts

Di Wu,Jiao Shi,Xiaoming Zheng,Jinxin Liu,Weidong Dou,Yongli Gao,Xiaoming Yuan,Fangping Ouyang,Han Huang

One-dimensional (1D) atomically thin crystals have attracted considerable interest due to their unique properties and potential applications. Herein, the chemical vapor deposition (CVD) growth of molybdenum disulfide (MoS 2 ) nanoribbons on sapphire(0001) supported monolayer MoS 2 flakes without catalysts as well as the characterizations by means of Raman and photoluminescence (PL) spectroscopy, optical microscopy (OM), atomic force microscopy (AFM), and scanning transmission electron microscopy (STEM). The Raman and PL results is reported, as well as OM images reveal that such MoS 2 nanoribbons grow on monolayer MoS 2 flakes. STEM and selected area electron diffraction (SAED) results reveal that they are grown along the 〈 10 1 ¯ 0 〉 direction with atomically sharp edges. Controlled experiments show that the deficiency of sulfur vapor at the beginning of growth induced 1D MoO x S 2− x crystals as precursors. The subsequent sulfurization changes them into MoS 2 nanoribbons. These findings provide a facile approach to MoS 2 nanoribbons and enrich the horizon of the preparation of nanostructured transition metal dichalcogenides.

研究领域: 材料科学 · 纳米科技 · 表面科学 · 凝聚态物理 · 低维材料

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Catalyst-free one-pot three-component rapid synthesis of polysubstituted pyrroles by liquid-assisted grinding

Catalyst-free 2+2 Photodimerization of 1,4-Bis[2-(4-pyridyl)ethenyl]-benzene in Solution Under Low Power UV Irradiation

CVD Grown MoS2 Nanoribbons on MoS2 Covered Sapphire(0001) Without Catalysts