Results 21 to 30 of about 161,569 (262)

Characterizing carbonyl compounds and their sources in Fuzhou ambient air, southeast of China [PDF]

PeerJ, 2020
In recent years, ozone (O3) concentrations in the southeastern coastal areas of China have shown a gradual upward trend. As precursors and intermediates in the formation of O3, carbonyl compounds play key roles in the atmospheric photochemical oxidation ...
Zhen He, Xin Zhang, Yunfeng Li, Xuefen Zhong, Hong Li, Rui Gao, Jinjuan Li   +6 more
doaj   +2 more sources

Polyfunctionalization of vicinal carbon centers and synthesis of unsymmetric 1,2,3,4-tetracarbonyl compounds

Nature Communications, 2023
The synthesis of polycarbonyl compounds featuring four or more carbonyl groups is a synthetic challenge for organic chemists. Here, the authors describe how unsymmetric polycarbonyl compounds bearing up to 4 adjacent carbonyl groups can be accessed ...
Luca De Angelis, Chao Pei, Ana L. Narro, Daniel Wherritt, Rene M. Koenigs, Michael P. Doyle   +5 more
doaj   +1 more source

Heterocycles Synthesis at Carbonylation of Acetylenic Compounds

Eurasian Chemico-Technological Journal, 2003
The carbonylation of unsaturated hydrocarbons, alcohols, organic halides and other substrates catalyzed by transition metals, salts of transition metals and organometallic complexes is a wide used synthesis method of new carbonyl, carboxyl and alkoxy ...
S.A. Vizer, K.B. Yerzhanov
doaj   +1 more source

Atmospheric carbonyl compounds are crucial in regional ozone heavy pollution: insights from the Chengdu Plain Urban Agglomeration, China [PDF]

Atmospheric Chemistry and Physics
Gaseous carbonyl compounds serve as crucial precursors and intermediates in atmospheric photochemical reactions, significantly contributing to ambient ozone formation.
J. Bao, J. Bao, X. Zhang, X. Zhang, Z. Wu, L. Zhou, J. Qian, Q. Tan, F. Yang, J. Chen, Y. Li, H. Liu, L. Deng, H. Li   +13 more
doaj   +1 more source

Cell wall target fragment discovery using a low‐cost, minimal fragment library

FEBS Letters, EarlyView.
LoCoFrag100 is a fragment library made up of 100 different compounds. Similarity between the fragments is minimized and 10 different fragments are mixed into a single cocktail, which is soaked to protein crystals. These crystals are analysed by X‐ray crystallography, revealing the binding modes of the bound fragment ligands.
Kaizhou Yan, Mathew Stanley, Olawale Raimi, Andrew T. Ferenbach, Helge C Dorfmueller, Daan M. F. van Aalten   +5 more
wiley   +1 more source

Understanding Ozone Formation and Carbonyl Contributions in the Seoul Metropolitan Area

Aerosol and Air Quality Research, 2023
With strong air quality policies in place in China and South Korea in recent years, it is important to understand the changing situation to address the increasing surface ozone problem in Korea. We revisited the ozone formation condition and investigated
Seung-Ha Lee, Ji-Seon Lee, Hyung-Min Lee, Hyeong-Ahn Kwon, Caroline R. Nowlan, Gonzalo González Abad, Rokjin J. Park, Ji-Hoon Park, Soyoung Kang, Hye-Jung Shin, Dai-Gon Kim, Jung-Min Park   +11 more
doaj   +1 more source

Structural insights into an engineered feruloyl esterase with improved MHET degrading properties

FEBS Letters, EarlyView.
A feruloyl esterase was engineered to mimic key features of MHETase, enhancing the degradation of PET oligomers. Structural and computational analysis reveal how a point mutation stabilizes the active site and reshapes the binding cleft, expading substrate scope.
Panagiota Karampa, Konstantinos Makryniotis, Theofani‐Iosifina Sousani, Evangelos Topakas, Vangelis Daskalakis, Maria Dimarogona   +5 more
wiley   +1 more source

A methionine‐lined active site governs carbocation stabilization and product specificity in a bacterial terpene synthase

FEBS Letters, EarlyView.
This study reveals a unique active site enriched in methionine residues and demonstrates that these residues play a critical role by stabilizing carbocation intermediates through novel sulfur–cation interactions. Structure‐guided mutagenesis further revealed variants with significantly altered product profiles, enhancing pseudopterosin formation. These
Marion Ringel, Carl P. O. Helmer, Shani Zev, Ronja Driller, Emily Buhr, Markus Reinbold, Renana Schwartz, Gabriel Foley, Mikael Boden, Daniel Garbe, Gerhard Schenk, Dan Thomas Major, Bernhard Loll, Thomas Brück   +13 more
wiley   +1 more source

Transformation of Carbonyl Compounds into Dinitrobenzene Derivatives

CHIMIA, 1975
2-chloronitroethylene and its precursor, 2,2-dichloronitroethane transform the keto- and aldoenamines having a β-hydrogen atom into variously substituted dinitrobenzenes.
H.G. Viehe, R. Verbruggen
doaj   +1 more source

Synthetic ligustrazine based cyclohexanone and oxime analogs as Anti-Trypanosoma and Anti-Leishmanial agentes

Brazilian Journal of Pharmaceutical Sciences, 2021
In the present study a series of 34 synthetic ligustrazine-containing α, β-Unsaturated carbonyl-based compounds and oximes, recognized as anticancer compounds were assessed against protozoa of the Trypanosoma and Leishmania species.
Abdulsalam A. M. Alkhaldi, Harry P. de Koning, Syed Nasir Abbas Bukhari   +2 more
doaj   +1 more source