Therien Group Seminar: Porphyrinoids as catalysts for visible-light induced selective functionalizations
Professor Dorota Gryko (Polish Academy of Sciences, Institute of Organic Chemistry)
Host: Professor Michael Therien
Friday, August 18, 2017 - 4:00pm to 5:30pm
Location: French Family Science Center 1243
Rosenthal, Janet

Link for Professor Gryko

Abstract:  Our life depends on porphyrinoids and these tetrapyrroles are referred as pigments of life. They are responsible for oxygen transport (heam), electron transport (cytochrome c), and photosynthesis (chlorophyll a) - the most crucial processes for human being. Without the chlorophylls and bilins life as we know would not exist on our planet. This green pigment is, in the first, instance responsible for transforming light energy into the chemical reactivity with the ultimate production of starch (photosynthesis). In the energy shortage era, we should follow nature and take an advantage Pigments of life from the unlimited source of energy.

Although photocatalysis has been already applied in few industrial applications (photooxygenation of citronellol for the synthesis of rose oxide, artemisinin, photocatalytically induced radical polymerization), these represent a small fish in the big ocean of science. In this line photoredox catalysis has recently emerged as powerful tool for the formation of C-C bonds mainly catalyzed by ruthenium and iridium complexes. But, they are both very expensive and undesirable by pharmaceutical industry. On the other hand organic dyes exhibit considerable advantages and in fact they have been shown to act as photoredox catalysts with eosin Y being the most widely studied.

This presentation will highlight a successful application of porphyrinoids both as photosensitizers and as photoredox catalysts for visible-light induced selective functionalizations.