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Visible-Light-Induced C(sp)-H Activation for Minisci Alkylation of Pyrimidines Using CHCl as Radical Source and Oxidant.
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January 2025
School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi 530004, China.
A highly efficient Minisci reaction of pyrimidines with alkyl radical generated from visible-light-induced activation of simple C(sp)-H feedstocks such as (cyclo)alkanes, ethers, alcohols, esters, and amides is reported. A mechanistic study revealed that alkyl radical was generated via hydrogen atom transfer (HAT) of C(sp)-H with dichloromethyl radical (·CHCl), which was generated by photoreduction of chloroform.
View Article and Find Full Text PDFEffect of Oxygen Concentration on Volatile Precipitation and Critical Ignition Point.
ACS Omega
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School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), D11 Xueyuan Road, Haidian District, Beijing 100083, P. R. China.
The purpose of this study was to investigate the impact of the oxygen concentration on the ignition of bituminous coal. Different oxygen concentrations and temperatures were used in the large-scale oxidation experiments to collect oxidized coals, which were then extracted with chloroform. And compare the critical ignition temperature of different mass samples.
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Laboratory of Engineering, Electrochemistry, Modeling and Environment Faculty of Sciences Dhar El Mahraz, Sidi Mohamed Ben Abdellah University, Fez, Morocco.
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PLoS One
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School of Biological Sciences, Universiti Sains Malaysia, Gelugor, Penang, Malaysia.
This study focuses on a novel lipase from Bacillus licheniformis IBRL-CHS2. The lipase gene was cloned into the pGEM-T Easy vector, and its sequences were registered in GenBank (KU984433 and AOT80658). It was identified as a member of the bacterial lipase subfamily 1.
View Article and Find Full Text PDFEfficient Method of ()-Nicotine Synthesis.
Molecules
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Faculty of Medicine, The John Paul II Catholic University of Lublin, Konstantynów 1J/4.03, 20-708 Lublin, Poland.
Improved methods for the synthesis of nicotine are of great importance due to the wide range of applications of synthetic nicotine, which is free from contamination with nitrosamines. Herein, we present a four-step chemical synthesis of ()-nicotine, involving the reduction in myosmine, enantiomeric separation of nornicotine, and subsequent methylation of the appropriate enantiomer of nornicotine obtained. The reduction in myosmine was investigated using both electrochemical and chemical approaches, achieving up to 90% yields of pure nornicotine.
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