10.18453/rosdok_id00004745 Dasi, Rajesh Rajesh Dasi http://d-nb.info/gnd/1357991592 Universität Rostock 2023 500 Natural sciences 540 Chemistry & allied sciences 2023 en https://purl.uni-rostock.de/rosdok/id00004745 urn:nbn:de:gbv:28-rosdok_id00004745-8 The content of this thesis is presented in three parts. In the first part, the radical functionalisation of biomass-derived 5-chloromethylfurfural (CMF) was described. In the second part, visible light-mediated triplet-sensitized [2+2] and [3+2] photocycloadditions of 2-cyanochromone with several alkenes were demonstrated using Iridium photocatalyst. The last part describes the a photocatalytic one-pot dehydrogenative Aza Paternò-Büchi reaction of dihydroquinoxalinones with substituted styrenes and acrylonitriles for the synthesis of diverse functionalised azetidine derivatives.