已经表明,含有p - N , N - 二烷基氨基亚苄基氰基乙酸酯基序的化合物可以用作荧光非机械粘度传感器。这些被称为分子转子的化合物属于一类荧光探针,已知它们在激发态会形成扭曲的分子内电荷转移复合物。在这项研究中,我们介绍了这些化合物作为粘度传感器的合成和光谱表征。讨论了这些转子的分子结构和电子密度对发射波长、荧光强度和粘度敏感性的影响。
amount of InCl3 and aceticanhydride remarkably promotes the Knoevenagel condensation of a variety of aldehydes and activated methylene compounds. This catalytic system accommodates aromatic aldehydes containing a variety of electron-donating and -withdrawing groups, heteroaromatic aldehydes, conjugate aldehydes, and aliphatic aldehydes. Central to successfully driving the condensation series is the formation
Solid-phase synthesis of arylidene and alkylidene malonates, as versatile intermediates, catalyzed using mesoporous poly-melamine–formaldehyde as a nitrogen-rich porous organic polymer (POP)
作者:Nader Ghaffari Khaligh、Hayedeh Gorjian、Hoda Fahim、Salam J. J. Titinchi
DOI:10.1007/s11164-021-04476-w
日期:2021.9
could be recovered and reused ten times, and the results showed a negligible loss of catalytic activity. Various aryl- and heteroarylidene malonates, as well as dimethyl (cyclohexylidene)malonate, were isolated in good to high yields under optimal conditions. The use of hazardous reagents and solvents were minimized in the current method, and separation of catalyst and products, as well as the recovery
Molecular rotors: synthesis and evaluation as viscosity sensors
作者:Jeyanthy Sutharsan、Darcy Lichlyter、Nathan E. Wright、Marianna Dakanali、Mark A. Haidekker、Emmanuel A. Theodorakis
DOI:10.1016/j.tet.2010.01.093
日期:2010.4
It has been shown that compounds containing the p-N,N-dialkylaminobenzylidene cyanoacetate motif can serve as fluorescent non-mechanical viscosity sensors. These compounds, referred to as molecular rotors, belong to a class of fluorescent probes that are known to form twisted intramolecularcharge-transfercomplexes in the excited state. In this study we present the synthesis and spectroscopic characterization
已经表明,含有p - N , N - 二烷基氨基亚苄基氰基乙酸酯基序的化合物可以用作荧光非机械粘度传感器。这些被称为分子转子的化合物属于一类荧光探针,已知它们在激发态会形成扭曲的分子内电荷转移复合物。在这项研究中,我们介绍了这些化合物作为粘度传感器的合成和光谱表征。讨论了这些转子的分子结构和电子密度对发射波长、荧光强度和粘度敏感性的影响。
Reductive Knoevenagel Condensation with the Zn–AcOH System
作者:Ekaterina M. Budynina、Konstantin L. Ivanov、Mikhail Ya. Melnikov
DOI:10.1055/s-0040-1705940
日期:2021.4
gram-scale one-pot approach to 2-substituted malonates and related structures is developed, starting from commercially available aldehydes and active methylene compounds. The technique combines Knoevenagelcondensation with the reduction of the C=C bond in the resulting activated alkenes with the Zn–AcOH system. The relative ease with which the C=C bond reduction occurs can be traced to the accepting abilities