3155-01-9Relevant articles and documents
Novel routes to N-amino-1H-pyrrolo[2,3-b]pyridines from α-hydroxyarylalkyl ketones and hydrazines
Chudinov,Gashev,Firgang,Semenov
, p. 1612 - 1616 (2007)
Treatment of 3-hydroxy-3-(3-pyridyl)butan-2-one hydrazone with polyphosphoric acid gave 1-amino-2,3-dimethyl-1H-pyrrolo[2,3-b]pyridine. An analogous reaction with 2,4-dinitrophenylhydrazone of the same ketone yielded 1-(2,4-dinitrophenyl)-3-methyl-4-(3-pyridyl)pyrazole.
ELECTRO-OPTIC POLYMER
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Paragraph 0150-0153; 162, (2021/02/05)
The present invention provides an electro-optic polymer (EO polymer) comprising an electro-optic molecule (EO molecule) and a base polymer. The EO polymer of the present invention has good performance over the entire optical communication wavelength range
D-π-A chromophores with a quinoxaline core in the π-bridge and bulky aryl groups in the acceptor: Synthesis, properties, and femtosecond nonlinear optical activity of the chromophore/PMMA guest-host materials
Balakina, Marina Yu,Budnikova, Yulia H.,Dudkina, Yulia B.,Fazleeva, Guzel M.,Fominykh, Olga D.,Islamova, Liliya N.,Kalinin, Alexey A.,Khamatgalimov, Ayrat R.,Levitskaya, Alina I.,Mukhtarov, Anvar S.,Nizameev, Irek R.,Sharipova, Anastasiya V.,Shmelev, Artemiy G.,Vakhonina, Tatyana A.
, (2020/09/04)
Novel D-π-A chromophores with quinoxaline/quinoxalinone core in the π-conjugated bridge and various bulky groups in the acceptor moiety have been synthesized and systematically investigated at molecular level by UV–Vis spectroscopy, DFT calculations, electrochemical and TGA-DSC methods as well as at materials level by the example of PMMA-based composite polymer materials doped with different chromophore contents using molecular modeling and SHG technique. Chromophores exhibit positive dioxane/chloroform solvatochromic shift of ca. 50 nm, high values of first hyperpolarizability and dipole moment, small energy gap and good thermal stability. Tolyl and cyclohexylphenyl substituents unlike phenyl can be treated as most effective isolating groups, preventing chromophore pronounced aggregation even at 30 wt% content. Femtosecond nonlinear optical (NLO) activity was studied for poled thin guest-host polymer films with various chromophore weight content. Film DBA-VQPhV-TCFPhCy(25 wt%)/PMMA with bulky cyclohexylphenyl groups in chromophore acceptor shows maximal NLO coefficient, d33, values among the studied materials (37 pm/V) as well as good long-term stability of NLO response together with excellent chromophore thermal stability (Td = 256 °C). Composite materials doped with quinoxaline chromophores are photostable with respect to laser pulses with peak intensities up to 11 GW/cm2.
A CO2-mediated base catalysis approach for the hydration of triple bonds in ionic liquids
Han, Buxing,Ke, Zhengang,Li, Ruipeng,Liu, Zhimin,Tang, Minhao,Wang, Yuepeng,Zeng, Wei,Zhang, Fengtao,Zhao, Yanfei
supporting information, p. 9870 - 9875 (2021/12/27)
Herein, we report a CO2-mediated base catalysis approach for the activation of triple bonds in ionic liquids (ILs) with anions that can chemically capture CO2 (e.g., azolate, phenolate, and acetate), which can achieve hydration of triple bonds to carbonyl chemicals. It is discovered that the anion-complexed CO2 could abstract one proton from proton resources (e.g., IL cation) and transfer it to the CN or CC bonds via a six-membered ring transition state, thus realizing their hydration. In particular, tetrabutylphosphonium 2-hydroxypyridine shows high efficiency for hydration of nitriles and CC bond-containing compounds under a CO2 atmosphere, affording a series of carbonyl compounds in excellent yields. This catalytic protocol is simple, green, and highly efficient and opens a new way to access carbonyl compounds via triple bond hydration under mild and metal-free conditions.
