Results 31 to 40 of about 97,443 (299)

Densities, Apparent Molar Volume, Expansivities, Hepler’s Constant, and Isobaric Thermal Expansion Coefficients of the Binary Mixtures of Piperazine with Water, Methanol, and Acetone at T = 293.15 to 328.15 K

International Journal of Chemical Engineering, 2018
The properties of 3 binary mixtures containing piperazine were investigated in this work. In a first step, the densities for the two binary mixtures (piperazine + methanol) and (piperazine + acetone) were measured in the temperature range of 293.15 to ...
Qazi Mohammed Omar, Jean-Noël Jaubert, Javeed A. Awan   +2 more
doaj   +1 more source

Evaluating the Ability of Methyldiethanolamine/Piperazine Microemulsion in CO2 Absorption [PDF]

شیمی کاربردی روز, 2023
In this study CO2 absorption into aqueous droplets of N-methyl-diethanolamine (MDEA) in water-in-oil (w/o) and oil-in-water (o/w) emulsions were investigated in batch-stirred reactor at 298 K and different CO2 partial pressure in the range of 0.1-0.5 bar.
Masoud Nasiri, Monireh Zolfaghari, Ali Haghighi Asl   +2 more
doaj   +1 more source

Novel piperazine based compounds as potential inhibitors for SARS-CoV-2 Protease Enzyme: Synthesis and molecular docking study

Journal of Molecular Structure, 2021
Structurally diverse piperazine-based compounds hybrid with thiadiazole, isatin or with sulfur/nitrogen, functionalities were synthesized. The structures of the new compounds were established based on their spectral data and elemental analysis.
A. Z. Omar, Tawfik Mosa, Samer K. Elsadany, Ezzat A. Hamed, Mohamed A. El-atawy   +4 more
semanticscholar   +1 more source

Simultaneous detection of controlled substances in waste water [PDF]

, 2013
This study presents a method of simultaneous detection of both traditional and newly emerged drugs of abuse in wastewater. The method is based on solid phase extraction and gas chromatography-mass spectrometry analysis.
Cole, Michael D., Gautam, Lata, Hall, Sarah, Mwenesongole, Ellen M., Waterhouse, John S.   +4 more
core   +3 more sources

Rearrangement of Imidazolidine to Piperazine Rings in the Presence of Dy^III

Chemistry Proceedings, 2022
The formation of imidazolidines from secondary amines and aldehydes is well known. This small cycle can act as a nitrogen donor, and it is usually stable when it coordinates to metal ions.
Julio Corredoira-Vázquez, Paula Oreiro-Martínez, Ana M. García Deibe, Jesús Sanmartín-Matalobos, Matilde Fondo   +4 more
doaj   +1 more source

4-(4-Methylphenylsulfonyl)piperazin-1-ium trifluoroacetate

Acta Crystallographica Section E, 2013
In the title salt, C11H17N2O2S+·CF3COO−, the cation is protonated at the secondary piperazine N atom. The dihedral angle between the benzene ring and the piperazine mean plane is 85.54 (10)°.
S. Sreenivasa, N. R. Mohan, T. Madhu Chakrapani Rao, P. A. Suchetan, B. S. Palakshamurthy, Vijithkumar   +5 more
doaj   +1 more source

The alpha-effect in cyclic secondary amines: new scaffolds for iminium ion accelerated transformations [PDF]

, 2009
Five-membered secondary amine heterocycles containing an α-heteroatom were prepared and shown to be ineffective as catalysts for the iminium ion catalysed Diels–Alder reaction between cinnamaldehyde and cyclopentadiene.
Cavill, Julie L., Elliott, Richard L., Evans, Gareth, Gibbs, Timothy J. K., Jones, Ian L., Platts, James A, Porzelle, Achim, Tomkinson, Nick   +7 more
core   +1 more source

Piperazine-2,3,5,6-tetraone [PDF]

Acta Crystallographica Section E Structure Reports Online, 2010
The mol-ecule of the title compound, C(4)H(2)N(2)O(4), is located around an inversion center and the four O atoms are in the 2,3,5,6-positions of the piperazine ring. In the crystal, bifurcated N-H⋯O hydrogen bonds link the mol-ecules into a corrugated layer parallel to (101).
Yi-Min Jiang, Shu-Hua Zhang, Jing-Jing Jia, Shi-Zhang Liang, Xiu-Jin Meng   +4 more
openaire   +3 more sources

Recent advances in photocatalytic hydrogen peroxide production

PhotoMat, EarlyView., 2023
We classify the representative photocatalytic materials for photosynthesis of hydrogen peroxide (H2O2) in recent years and discuss the related modification methods in detail, providing inspiration and insights for the future design of photocatalysts for H2O2 production.
Jinyu Yan, Yuan Li, Yunxiang Li, Shuxin Ouyang, Tierui Zhang   +4 more
wiley   +1 more source

Process intensification for post combustion CO₂ capture with chemical absorption: a critical review [PDF]

, 2015
The concentration of CO₂ in the atmosphere is increasing rapidly. CO₂ emissions may have an impact on global climate change. Effective CO₂ emission abatement strategies such as carbon capture and storage (CCS) are required to combat this trend.
Abanades, Abu-Zahra, Agarwal, Agbonghae, Agbonghae, Agbonghae, Albo, Aronu, Asendrych, Atuman S. Joel, Barham, Benson, Bernardo, Biliyok, Bishnoi, Boodhoo, Bounaceur, Brechtelsbauer, Brunetti, Burns, Buzek, Car, Chambers, Chen, Chen, Chen, Chen, Chen, Chen, Cheng, Cheng, Cheng, Cheng, Cheng, Cheung, Clausse, Colin Ramshaw, Cramers, Dag Eimer, Dasgupta, Dasgupta, Dobie, Drage, Dugas, Durán-Guevara, Errey, Favre, Field, Freeman, Freund, Gibbins, Gil, González, González, Goto, Han, Haszeldine, Hedin, Herzog, Herzog, Hesselgreaves, Hlaing, Huang, Jassim, Joel, Joel, Kapica-Kozar, Kim, Kishimoto, Kolev, Kothandaraman, Krishna, Kvamsdal, Kvamsdal, Kvamsdal, Kvamsdal, Lawal, Lawal, Lawal, Lawal, Li, Li, Lin, Lin, Lin, Lin, Lin, Lucquiaud, Lucquiaud, Luo, Luo, Luo, Mac Dowell, Mac Dowell, Mac Dowell, MacDowell, Machado, Mangalapally, Mangalapally, Mangalapally, Mangalapally, Maring, Mason, Meeuwse, Meeuwse, Meeuwse, Meihong Wang, Mimura, Mimura, Munjal, Nikitin, Nuhu M. Musa, Oexmann, Onda, Parshetti, Picon-Nunez, Plaza, Rajan, Raynal, Raynal, Reay, Resnik, Riffat, Riffat, Roberge, Roberge, Samanta, Sander, Sebastia-Saez, Semkov, Shah, Shakerian, Shaw, Shehata, Shi, Sternling, Stéphenne, Stöver, Tan, Tobiesen, Tsuzuki, Tung, Wang, Wang, Wang, Wang, Wappel, Wei, Xu, Yang, Yi, Yu, Yu, Yu, Yu, Zhang, Zhang, Zhang, Zhao, Zhao, Zhao, Zhao   +161 more
core   +1 more source