排序方式: 共有356条查询结果,搜索用时 15 毫秒
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Ryabukhin SV Naumchik VS Plaskon AS Grygorenko OO Tolmachev AA 《The Journal of organic chemistry》2011,76(14):5774-5781
A general approach to 3-fluoro-, 3-chloro-, and 3-bromoquinolines which relies on organosilane-promoted Friedla?nder reaction of α-haloketones is described. The scope of the methylene component as well as influence of the organosilane component on the outcome of the reaction is studied. The method can be used under parallel synthesis conditions. 相似文献
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Li-Hua Yu Zhen-Feng Cai Lander Verstraete Yuanzhi Xia Yuan Fang Louis Cuccia Oleksandr Ivasenko Steven De Feyter 《Chemical science》2022,13(44):13212
Herein we report the impact of covalent modification (grafting), inducing lateral nanoconfinement conditions, on the self-assembly of a quinonoid zwitterion derivative into self-assembled molecular networks at the liquid/solid interface. At low concentrations where the compound does not show self-assembly behaviour on bare highly oriented pyrolytic graphite (HOPG), close-packed self-assembled structures are visualized by scanning tunneling microscopy on covalently modified HOPG. The size of the self-assembled domains decreases with increasing the density of grafted molecules, i.e. the molecules covalently bound to the surface. The dynamics of domains are captured with molecular resolution, revealing not only time-dependent growth and shrinkage processes but also the orientation conversion of assembled domains. Grafted pins play a key role in initiating the formation of on-surface molecular self-assembly and their stabilization, providing an elegant route to study various aspects of nucleation and growth processes of self-assembled molecular networks.We showcase the use of covalently modified HOPG for the investigation of domain size controlled 2D self-assembly, nucleation and growth kinetics, molecular adsorption/desorption thermodynamics, and tip-induced selective recrystallization. 相似文献
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Nazar Dovhaniuk Dr. Oleksandr P. Blahun Bohdan Sosunovych Mykhailo O. Redka Bohdan V. Vashchenko Prof. Dr. Oleksandr O. Grygorenko 《European journal of organic chemistry》2023,26(3):e202201226
A novel efficient method for the synthesis of licochalcone C in good yield on up to 30 g scale was developed. The reaction sequence included relied on the directed ortho-metalation (DOM) of bis-O-MOM-protected resorcinol for the regioselective C-prenylation, followed by metalation-formylation, selective O-deprotection of a hydroxyl group located between the formyl and prenyl groups, its methylation, and aldol reaction with p-hydroxyacetophenone. Synthesis of structurally related retrochalcones, i.e., licoagrochalcones B, C, and D, was also proposed. 相似文献
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Oleksandr V. Hadzhy Igor I. Skrypnik Mykhailo V. Voitovych 《Mathematische Nachrichten》2023,296(9):3892-3914
We prove continuity and Harnack's inequality for bounded solutions to elliptic equations of the type under the precise choice of μ. 相似文献