Diethyl ether added as an entrainer (cosolvent) to near- and supercritical CO2 significantly enhanced the enantioselectivity of photocyclization of 5,5-diphenyl-4-penten-1-ol sensitized by saccharide naphthalenedicarboxylate to give a cyclization product in enantiomeric excesses much larger than those obtained in conventional organic solvents, revealing the unique features of nc- and sc-CO2 as well as the critical role of entrainer clustering to the intervening diastereomeric exciplex pair.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/ja801254z | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Surface wettability governs brine evaporation and salt precipitation during carbon sequestration in saline aquifers: Microfluidic insights.
Sci Total Environ
December 2024
Faculty of Drilling, Oil and Gas, AGH University of Krakow, al. Mickiewicza 30, 30-059, Krakow, Poland.
Carbon sequestration in deep saline aquifers is a promising strategy for reducing atmospheric CO emissions. However, salt precipitation triggered by the evaporation of formation brine into injected supercritical CO can cause injectivity and containment issues in near-wellbore regions. Predicting the distribution of precipitated salts and their impact on near-wellbore properties remains challenging.
View Article and Find Full Text PDFPreparation of amorphous silicon-doped YO aerogel enabling nonlinear optical features for ultrafast photonics.
Nanophotonics
April 2024
School of Information Science and Engineering, Key Laboratory of Laser and Infrared System of Ministry of Education, Shandong University, Qingdao 266237, China.
Amorphous aerogels with the microscopic nanoscale three-dimensional meshes provide superb platforms for investigating unique physicochemical properties. In order to enhance the physical, thermal and mechanical performances, one efficient and common approach is integrating diverse functional materials. Herein, we report a simple strategy to fabricate the amorphous silicon doped YO aerogels with the post-gelation method under the N/EtOH supercritical atmosphere.
View Article and Find Full Text PDFDirect observation of ultrafast cluster dynamics in supercritical carbon dioxide using X-ray Photon Correlation Spectroscopy.
Nat Commun
December 2024
Mechanical Engineering Department, Stanford University, Stanford, CA, 94305, USA.
Supercritical fluids exhibit distinct thermodynamic and transport properties, making them of particular interest for a wide range of scientific and engineering applications. These anomalous properties emerge from structural heterogeneities due to the formation of molecular clusters at conditions above the critical point. While the static behavior of these clusters and their effects on the thermodynamic response functions have been recognized, the relation between the ultrafast cluster dynamics and transport properties remains elusive.
View Article and Find Full Text PDFOne-Pot Synthesis of (CrMnFeCoNi)O High-Entropy Oxides for Efficient Catalytic Oxidation of Propane: A Promising Substitute for Noble Metal Catalysts.
ACS Appl Mater Interfaces
December 2024
Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resource Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, P.R. China.
Article Synopsis
- The catalytic oxidation of propane is challenging, but high-entropy oxides (HEOs) like (CrMnFeCoNi)O show promise due to their unique properties.
- The (CrMnFeCoNi)O HEO catalysts are made through a continuous hydrothermal flow synthesis (CHFS) method, resulting in smaller particle sizes and higher surface areas without the need for additional calcination.
- This catalyst achieves a 90% propane conversion at 255 °C and outperforms traditional catalysts like Pt/AlO and Pd/AlO in activity and stability, making it a potential alternative for industrial use.
Numerical simulation of a two-dimensional Blume-Capel ferromagnet in an oscillating magnetic field with a constant bias.
Phys Rev E
October 2024
PoreLab, NJORD Centre, Department of Physics, University of Oslo, P.O. Box 1048 Blindern, 0316 Oslo, Norway and Department of Physics, Florida State University, Tallahassee, Florida 32306-4350, USA.
We perform a numerical study of the kinetic Blume-Capel (BC) model to find if it exhibits the metamagnetic anomalies previously observed in the kinetic Ising model for supercritical periods [P. Riego et al., Phys.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!