Results 331 to 340 of about 2,813,819 (368)

Morpholine as a privileged structure: A review on the medicinal chemistry and pharmacological activity of morpholine containing bioactive molecules

Medicinal research reviews (Print), 2020
Morpholine is a heterocycle featured in numerous approved and experimental drugs as well as bioactive molecules. It is often employed in the field of medicinal chemistry for its advantageous physicochemical, biological, and metabolic properties, as well ...
A. Kourounakis, Dimitrios Xanthopoulos, Ariadni Tzara   +2 more
semanticscholar   +1 more source

Chairs!: A Mobile Game for Organic Chemistry Students To Learn the Ring Flip of Cyclohexane

, 2016
The hallmark of game-based learning is that students discover concepts through trial and error as they play. With the digital landscape in higher education shifting to mobile-first, new tools for learning chemistry are both possible and needed ...
Julia E. Winter, Michael T. Wentzel, Sonia Ahluwalia   +2 more
semanticscholar   +1 more source

ChemInform Abstract: New Advances in the Chemistry of the Phosphirene Ring.

ChemInform, 1987
Abstract Some recent developments of the chemistry of phos-phirenes are reviewed. They include two new syntheses of the ring, a preliminary investigation on the reactivity of 1-chlorophosphirenes and various ring expansions.
openaire   +3 more sources

The chemistry of selective ring-opening catalysts

Applied Catalysis A: General, 2005
Abstract Bitumen-derived crude and heavy oils require severe processing and produce middle distillate product with poor ignition quality. This becomes a concern to refiners as tighter specifications on transportation fuel are promulgated. One process to address this issue is selective ring opening of cycloparaffins to reduce the number of ring ...
Zbigniew Ring, Hong Yang, Craig Fairbridge, Hong-Bin Du   +3 more
openaire   +2 more sources

The chemistry of small ring compounds—XIV

Tetrahedron, 1972
Abstract The hydrogen isotope exchange rates of α-deuterio- and α-tritiocyclopropanes with electronwithdrawing substituents and the corresponding open 2-substituted propanes have been measured in solutions of sodium methoxide in methanol. Substituents fall in two classes: CF3, CN and ∅SO2 make the α-hydrogen in cyclopropanes more acidic than in the ...
H. Steinberg, W. Th. van Wijnen, Th. J. de Boer   +2 more
openaire   +2 more sources

A review of fatty epoxide ring opening reactions: Chemistry, recent advances, and applications

Journal of the American Oil Chemists Society, 2022
B. Moser, S. Cermak, K. Doll, J. Kenar, Brajendra K. Sharma   +4 more
semanticscholar   +1 more source

Interstellar detection of the highly polar five-membered ring cyanocyclopentadiene

, 2020
Much like six-membered rings, five-membered rings are ubiquitous in organic chemistry, frequently serving as the building blocks for larger molecules, including many of biochemical importance.
M. McCarthy, K. L. K. Lee, R. Loomis, A. Burkhardt, C. Shingledecker, S. Charnley, M. Cordiner, E. Herbst, S. Kalenskii, E. Willis, C. Xue, A. Remijan, B. McGuire   +12 more
semanticscholar   +1 more source

The application of coffee-ring effect in analytical chemistry

Trends in Analytical Chemistry (TrAC), 2022
Mingwei Yang, Dejian Chen, Jie Hu, Xinyu Zheng, Zu-jin Lin, Haomiao Zhu   +5 more
semanticscholar   +1 more source

Chemistry and pharmacology of ring-fluorinated catecholamines

Journal of Fluorine Chemistry, 1995
Abstract Naturally-occurring catecholamines have important and diverse physiological roles, including serving as chemical neurotransmitters. The responses of catecholamines functioning as adrenergic agonists can be profoundly altered by ring fluorination, depending on the site of fluorination and the nature of the agonist.
openaire   +2 more sources

Imaging the Photochemical Ring-Opening of 1,3-Cyclohexadiene by Ultrafast Electron Diffraction

, 2018
The ultrafast photoinduced ring-opening of 1,3-cyclohexadiene constitutes a textbook example of electrocyclic reactions in organic chemistry and a model for photobiological reactions in vitamin D synthesis.
T. Wolf, D. Sanchez, J. Yang, R. Parrish, J. P. Nunes, M. Centurion, R. Coffee, J. Cryan, M. Gühr, K. Hegazy, A. Kirrander, R. Li, J. Ruddock, X. Shen, T. Vecchione, S. Weathersby, P. Weber, K. Wilkin, H. Yong, Q. Zheng, X. Wang, M. Minitti, T. Martínez   +22 more
semanticscholar   +1 more source