Photochemical radical thiol–ene click-based methodologies for silica and transition metal oxides materials chemical modification: a mini-review

Abstract

The photochemical radical thiol–ene addition reaction (PRTEA) is a highly powerful synthetic technique for surface modification.

Oxygen insensitive thiol–ene photo-click chemistry for direct imprint lithography of oxides

“…Abstraction of a hydrogen radical from the neighborhood thiol to this carbon radical accomplishes the hydrothiolation, while simultaneously propagating the chain reaction. 9,17 Fabrication of micro/nanostructures of oxides is of paramount importance in various applications including photoelectrochemical cells, 18 photovoltaic cells, 19 sensors, 20 and catalysis. 21 Several techniques including photolithography, 22,23 electron-beam lithography, 24,25 electro-hydrodynamic lithography, 26,27 direct write assembly, 28 selective surface wetting, 29 dip-pen nanolithography, 30,31 nanoimprint lithography (NIL) [32][33][34] among others 35,36 have been utilized towards fabrication of metal oxide micro/nanostructures.…”

Towards Visible‐Light Photocatalytic Reduction of Hypercoordinated Silicon Species

“…By using a thiopyridine ligand, the corresponding thiyl radical has been liberated and efficiently trapped by an allylsulfone as an acceptor. Even if these radicals could be formed through the oxidation of pyridine thiolate like phenyl thiolate, no methodology has already been reported by using a reductive pathway. Experiments are currently ongoing in our laboratory for the formation of carbon‐centered radicals by photoreduction of other types of hypercoordinated silicon species.…”

Photocatalytic formation of carbon–sulfur bonds

“…A large number of photocatalytic C–S bond-forming methods report the preparation of sulfides. Non-photocatalytic procedures apply the so-called radical thiol–ene or radical thiol–yne reactions for efficient cross-coupling of thiols with olefins [ 24 , 29 – 30 ]. In 2013, Yoon and co-workers developed a photoredox-catalyzed version of the radical thiol–ene reaction ( Scheme 2 ) [ 31 ].…”