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A silver-catalyzed[3+3]-annulation cascade of alkynyl alcohols andα,β-unsaturated ketones for the regioselective assembly of chromanes

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Organic Chemistry Frontiers 2022年第3期9卷 802-809页

作者： Ashwini K.Nakate Sagar S.Thorat Shailja Jain Gamidi Rama Krishna Kumar Vanka ravindar kontham Organic Chemistry Division CSIR-National Chemical LaboratoryDr Homi Bhabha RoadPune-411008India Academy of Scientific and Innovative Research(AcSIR) Ghaziabad-201002India Centre for Materials Characterization CSIR-National Chemical LaboratoryDr Homi Bhabha RoadPune-411008India Physical and Materials Chemistry Division CSIR-National Chemical LaboratoryDr Homi Bhabha RoadPune-411008India

An unprecedented Ag(I)-catalyzed[3+3]-annulation of alkynyl alcohols(5-hexyn-1-ols)andα,β-unsaturated ketones is reported to construct simple to complex *** transformation begins with hydroalkoxylation of alkynol through C-C triple bond activation to give cyclic-enol ether,followed by intermolecular 1,4-addition and intramolecular 1,2-addition of enol ethers onto the enone and oxidative aromatization or Grob-type elimination steps.

关键词： alcohols unsaturated catalyzed

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Enhanced visible-light-driven photocatalysis of Bi2YO4CI heterostructures functionallized by bimetallic RhNi nanoparticles

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Frontiers of Materials Science 2018年第4期12卷 405-414页

作者： Palepu Teja ravindar Vidya Sagar CHOPPELLA Anil Kumar MOKSHAGUNDAM M.KIRUBA Sunil G.BABU Korupolu Raghu BABU L.John BERCHMANS Gosipathala SREEDHAR Electropyro Metallurgy Division CSIR-Central Electrochemical Research InstituteKaraikudi 630003Tamil NaduIndia Department of Engineering Chemistry Andhra University Collge of EngineeringAndhra UniversityVisakhapatnam-530003India School of Bio-Sciences and Biotechnology Babasaheb Bhimrao Ambedkar UniversityLucknow-226025India

Bismuth-based Sillen-Aurivillius compounds are being explored as efficient photocatalyst materials for the degradation of organic pollutants due to their unique layered structure that favours effective separation of electron-hole pairs. In this work, we synthesized Sillen-Aurivillius-related Bi2YO4Cl with the bandgap of 2.5 eV by a simple solid-state reaction and sensitized with rhodium nickel (RhNi) nanoparticles (NPs) to form the RhNi/Bi2YO4Cl heterostructure. Photocatalytic activities of BiOCl, Bi2YO4Cl and the RhNi/Bi2YO4Cl heterostructure were examined for the degradation of rhodamine- 6G under visible-light illumination. Results demonstrated that the photocatalytic dye degradation efficiency of RhNi/Bi2YO4Cl heterostructures is higher than those of BiOCl and Bi2YO4Cl, attributed to the synergistic molecular-scale alloying effect of bimetallic RhNi NPs. The plausible mechanism for the degradation of rhodamine-6G and the effective electron-hole pair utilization mechanism were discussed.

关键词： BiOCl Bi 2 YO 4 Cl RhNi catalyst rhodamine-6G photocatalysis

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