New porphyrazine macrocycles with high viscosity-sensitive fluorescence parameters
摘要:
New tetraaryltetracyanoporphyrazines have been obtained in the form of metal complexes and free bases via template assembly of a variety of aryltricyanoethylenes as structural units of the macrocycle, and photophysical properties of the products have been studied. The unique high sensitivity of the fluorescent properties to viscosity has been demonstrated. This property opens the possibility of application of the said compounds as sensors of local viscosity. The prepared macrocycles exhibit significant photocytotoxicity, and can be thus used as sensitizers of photodynamic therapy.
Visible-Light Photoredox-Catalyzed Hydroalkoxymethylation of Activated Alkenes Using α-Silyl Ethers as Alkoxymethyl Radical Equivalents
作者:Nilufa Khatun、Myeong Jun Kim、Sang Kook Woo
DOI:10.1021/acs.orglett.8b02721
日期:2018.10.5
electron oxidation (SET) of α-TMS-substituted ethers, followed by subsequent conjugate addition to activated alkenes. Various functional groups were tolerated both under mild metal and metal-free conditions to provide good to excellent yields. Furthermore, the addition products were transformed to valuable synthetic building blocks, such as carboxylic acids, γ-butyrolactones, and complex aryl alkyl ethers
Seven aromatichydrocarbons bearing a dicyanovinyl unit were prepared to determine the relationship between both the number of aromatic rings and location of acceptor substituent on their thermal and optoelectronic properties. Additionally, the density functional theory calculations were performed. The obtained compounds showed temperatures of the beginning of thermaldecomposition in the range of
Five desolvated PCPs exhibit efficiency as base catalysts for the Knoevenagel condensation reaction and show size selectivity under solvent-free conditions.
Microporous coordination polymer [Zn4(dmf)(ur)2(ndc)4] as a heterogeneous catalyst for the Knoevenagel reaction
作者:S. A. Sapchenko、D. N. Dybtsev、V. P. Fedin
DOI:10.1007/s11172-014-0748-7
日期:2014.10
The catalytic properties of the microporous metal-organic coordination polymer [Zn4(dmf)(ur)2(ndc)4] (dmf is N,N’-dimethylformamide, ur is urotropine, and ndc2- is 2,6-naphthalenedicarboxylate) for the Knoevenagel reaction were studied. The reaction between aromatic aldehydes (benzaldehyde, α-naphthaldehyde, 4-biphenylaldehyde, and 1-pyrenaldehyde) and malononitrile was studied. The coordination polymer was shown to be a heterogeneous catalyst that makes it possible to achieve 95% yield in the reaction between benzaldehyde and malononitrile. The selectivity of the catalyst depends on the size of aldehydes used in the reaction.
Impact of an aryl bulky group on a one-pot reaction of aldehyde with malononitrile and <i>N</i>-substituted 2-cyanoacetamide
作者:Ruturajsinh M. Vala、Divyang M. Patel、Mayank G. Sharma、Hitendra M. Patel
DOI:10.1039/c9ra05975j
日期:——
In this study, we successfully explored the effect of steric hindrance on the one-pot reaction of different aryl aldehydes with malononitrile and N-substituted 2-cyanoacetamide in the presence of piperidinium acetate as the catalyst. It involved the Knoevenagel condensation of the aldehyde and malononitrile to produce arylidene malononitrile as an intermediate, which was further treated with N-substituted