title: Synthesis of rigidified flavin-guanidinium ion conjugates and investigation of their photocatalytic properties.
abstract: Flavin chromophores can mediate redox reactions upon irradiation by blue light. In an attempt to increase their catalytic efficacy, flavin derivatives bearing a guanidinium ion as oxoanion binding site were prepared. Chromophore and substrate binding site are linked by a rigid Kemp's acid structure. The molecular structure of the new flavins was confirmed by an X-ray structure analysis and their photocatalytic activity was investigated in benzyl ester cleavage, nitroarene reduction and a Diels-Alder reaction. The modified flavins photocatalyze the reactions, but the introduced substrate binding site does not enhance their performance.
authors: Institute of Organic Chemisty, University of Regensburg, Universitätsstr. 31, D-93040 Regensburg, Germany.
authors: Harald
authors: H
authors: Schmaderer
authors: Mouchumi
authors: M
authors: Bhuyan
authors: Burkhard
authors: B
authors: König