GC: A Review of the State-of-the-Art Column Technologies for the Determination of ppm to ppb Levels of Oxygenated, Sulfur, and Hydrocarbon Impurities in C1-C5 Hydrocarbon Streams
作者:J. de Zeeuw、C. Duvekot、J. Peene、P. Dijkwel、P. Heijnsdijk
DOI:10.1093/chromsci/41.10.535
日期:2003.11.1
The determination of ppm to ppb levels of sulfur, oxygen-containing, and certain reactive hydrocarbons in bulk hydrocarbon feedstocks is important in the petroleum and petrochemical industry to minimize catalytic deactivation and improve product quality. Gas chromatography, coupled with selective or ultratrace universal detection (or both), is ideal in most cases for such analysis. However, to enhance
Visible‐Light‐Mediated Photocatalytic Synthesis of 2‐Substituted Oxazole‐5‐carbaldehydes Promoted by Benzeneseleninic Acid
作者:Laura Abenante、Gabriela Trisch Quadros、Gelson Perin、Claudio Santi、Filipe Penteado、Eder João Lenardão
DOI:10.1002/ejoc.202200641
日期:2022.8.19
visible light irradiation. Twelve 2-aryl oxazole-5-carbaldehydes, six of them so far unpublished, were formed in 30–90 % yield, from various N-(propargyl)benzamides in the reaction with benzeneseleninic acid in the presence of eosin Y. Notably, the coproduct diphenyl diselenide is quantitatively recovered and can be reused.