Synlett, Table of Contents Synlett 2017; 28(02): 235-238DOI: 10.1055/s-0036-1588897 letter © Georg Thieme Verlag Stuttgart · New York Aerobic Stereoselective Oxidation of Olefins on a Visible-Light-Irradiated Titanium Dioxide–Cobalt–Ascorbic Acid Nanohybrid Maasoumeh Jafarpour* Catalysis Research Laboratory, Department of Chemistry, Faculty of Science, University of Birjand, Birjand 97179-414, Iran Email: mjafarpour@birjand.ac.ir Email: rrezaeifard@birjand.ac.ir , Fahimeh Feizpour Catalysis Research Laboratory, Department of Chemistry, Faculty of Science, University of Birjand, Birjand 97179-414, Iran Email: mjafarpour@birjand.ac.ir Email: rrezaeifard@birjand.ac.ir , Abdolreza Rezaeifard* Catalysis Research Laboratory, Department of Chemistry, Faculty of Science, University of Birjand, Birjand 97179-414, Iran Email: mjafarpour@birjand.ac.ir Email: rrezaeifard@birjand.ac.ir › Author Affiliations Recommend Article Abstract Buy Article All articles of this category Abstract A visible-light-driven photocatalytically active nanocrystalline TiO2 was prepared by surface modification with a cobalt–ascorbic acid complex. The photocatalyst exhibited high activity and excellent chemo-, diastereo-, and stereoselectivities in the aerobic epoxidation of olefins under visible-light irradiation in the absence of a reducing agent. The catalyst proved efficient and could be recycled at least five times. Key words Key wordsepoxidation - alkenes - titanium dioxide - nanoparticles - ascorbic acid - nanohybrids Full Text References References and Notes 1a Saha D, Maity T, Bera R, Koner S. Polyhedron 2013; 56: 230 1b Tang B, Lu X.-H, Zhou D, Tian P, Niu Z.-H, Zhang J.-L, Chen X, Xia Q.-H. Catal. Commun. 2013; 31: 42 1c Wang J, Yang M, Dong W, Jin Z, Tang J, Fan S, Lu Y, Wang G. Catal. Sci. Technol. 2016; 6: 161 1d Zhang A, Li L, Li J, Zhang Y, Gao S. Catal. Commun. 2011; 12: 1183 1e Sha S, Yang H, Li J, Zhuang C, Gao S, Liu S. Catal. Commun. 2014; 43: 146 1f Sen R, Saha D, Mal D, Brandão P, Rogez G, Lin Z. Eur. J. Inorg. Chem. 2013; 5020 1g Song X, Zhu W, Li K, Wang J, Niu H, Gao H, Gao W, Zhang W, Yu J, Jia M. 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