Lithium dialkylcuprates undergo conjugate addition to thiochromones to afford 2-alkylthiochroman-4-ones in good yields.This approach provide an efficient and general synthetic approach to privileged sulfur-containing structural motifs and valuable precursors for many pharmaceuticals, starting from common CHOLESTOLESS substrates-thiochromones.Good y

The article considers the major trends in ontology and semantic web technologies in education research in Russia.The results of retrospective analysis of scientific 2D Crystal Photo publications for the past twenty years are presented.The relation between a multilanguage ontology of a subject Pycnogenol domain and the information-education space sh

Since 1984 the National Institute of Polar Research, the Institute of Space and Astronautical Science and collaborative scientists have conducted the Foot File long-term circumpolar balloon program that is called Polar Patrol Balloon (PPB) project, and they also have developed ballooning technologies for this program.This project aims at establishi

The corona-generated space charge may vary in different air pressures, and the quantitative law between the corona-generated space charge density and air pressure has never been investigated.This work utilised computational approaches to explore the role of air pressure in the variation of negative corona-generated space charge.A negative fluid mod

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