Results 31 to 40 of about 329,692 (304)

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

Infrared spectroscopy of phytochrome and model pigments [PDF]

, 1990
Fourier-transform infrared difference spectra between the red-absorbing and far-red-absorbing forms of oat phytochrome have been measured in H2O and 2H2O. The difference spectra are compared with infrared spectra of model compounds, i.e. the (5Z,10Z,15Z)-
Bagley K., Bagley K. A., Braiman M. S., Braslavsky S. E., Brock H., Cavaleiro J. A. S., Chai Y.-G., Eilfeld P., Engelhard M., Falk H., Farrens D. L., Fodor S. P. A., Furuya M., Ganter U. M., Grimm R., Grombein S., Holt R. E., Hsieh Y.-Z., Kendrick R. E., Kufer W., Lagarias J. C., Lagarias J. C., Lagarias J. C., Margulies L., Margulies L., Margulies L., Mathies R. A., Moon D.-K., Oseroff A. R., Rospendowski B. N., Rothschild K. J., Rudiger W., Sarkar H. K., Sawatzki J., Scheer H., Scheer H., Schendel R., Schirmer T., Schneider S., Shropshire W., Siebert F., Siebert F., Siebert F., Sulkes M., Szalontai B., Thummler F.   +45 more
core   +1 more source

Uprolides N, O and P from the Panamanian Octocoral Eunicea succinea. [PDF]

, 2016
Three new diterpenes, uprolide N (1), uprolide O (2), uprolide P (3) and a known one, dolabellane (4), were isolated from the CH₂Cl₂-MeOH extract of the gorgonian octocoral Eunicea succinea, collected from Bocas del Toro, on the Caribbean coast of Panama.
Fernandez, Patricia L, Gerwick, William H, González, Yisett, Gutiérrez, Marcelino, Guzmán, Héctor M, Gómez-Reyes, José Félix, López-Perez, José Luis, Torres-Mendoza, Daniel   +7 more
core   +2 more sources

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

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

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

Scope and Mechanistic Study of the Coupling Reaction of α,β-Unsaturated Carbonyl Compounds with Alkenes: Uncovering Electronic Effects on Alkene Insertion vs Oxidative Coupling Pathways [PDF]

, 2012
The cationic ruthenium-hydride complex [(C6H6)(PCy3)(CO)RuH]+BF4– (1) was found to be a highly effective catalyst for the intermolecular conjugate addition of simple alkenes to α,β-unsaturated carbonyl compounds to give (Z)-selective tetrasubstituted ...
Ackermann L., Ackermann L., Ackermann L., Ackermann L., Anastas P. T., Anastas P. T., Anslyn E. V., Arai T., Beccalli E. M., Berlin J. M., Bernasconi C. F., Chae S. Yi, Colby D. A., Colby D. A., Cristau H.-J., Do W. Lee, Donohoe T. J., Engle K. M., Flynn A. B., Foley N. A., Frantz D. E., Gansäuer A., Gao H., Giri R., Giri R., Guo L.-N., Hartwig J. F., Ho C.-Y., Hojo D., Huang C., Isaacs N. S., Itami K., Jun C.-H., Kakiuchi F., Kakiuchi F., Kakiuchi F., Ki-Hyeok Kwon, Kwon K.-H., Kwon K.-H., Lee D. W., Lee D.-H., Lemay A. B., Liu L., Lu Y., Maryanoff B. E., Matsubara R., Matsuura Y., McKinley N. F., Negishi E., Ni Y., Ogoshi S., Oh H. K., Park S. H., Patureau F. W., Patureau F. W., Patureau F. W., Pintori D. G., Rakshit S., Rakshit S., Sato T., Sheldon R. A., Shen Y., Shi B.-F., Singleton D. A., Stenne B., Strohfeldt K., Stuart D. R., Stuart D. R., Stuart D. R., Su Y., Tang J.-M., Trost B. M., Tsai A. S., Ueyama T., Umeda N., Vorfalt T., Wang F., Wasa M., Wasa M., Weissman H., Weston M. H., Ye M., Yi C. S., Yi C. S., Yokota T., Yu M., Zhang Y.-H., Zhao C., Zhou C., Zhou C., Zhu C.   +90 more
core   +2 more sources

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

Hydrogen-bonding interactions in the crystalline-phase structures of cinnamic acid derivatives [PDF]

, 1999
Secondary interactions responsible for the crystalline-phase structures of various cinnamic acids and cinnamic acid esters drawn from the Cambridge Structural Database were studied with the help of the Cerius package implemented on an SGI workstation ...
Pálinkó, István
core   +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