Aerobic Allylation of Alcohols with Non-Activated Alkenes Enabled by Light-Driven Selenium-π-Acid Catalysis

Synthesis ◽  
2018 ◽  
Vol 50 (19) ◽  
pp. 3875-3885 ◽  
Author(s):  
Alexander Breder ◽  
Katharina Rode ◽  
Martina Palomba ◽  
Stefan Ortgies ◽  
Rene Rieger
Keyword(s):  
Electron Transfer ◽  
Transfer Process ◽  
Acid Catalysis ◽  
Functional Group ◽  
Ambient Air ◽  
Electron Transfer Process ◽  
Optimized Conditions ◽  
Very High

A new organocatalytic protocol for the aerobic dehydrogenative allylation of alcohols using non-activated alkenes as the allylating reagent and ambient air as the terminal oxidant is established. Mechanistically, the procedure relies on the interplay of a diselane and a photo­redox catalyst by means of a light-induced electron transfer process. Under optimized conditions, a broad range of both cyclic and acyclic ethers is accessed with very high functional group tolerance and excellent regioselectivity.

Iron-Catalyzed Wacker-Type Oxidation

Synlett ◽  
2018 ◽  
Vol 29 (04) ◽  
pp. 383-387 ◽  
Author(s):  
Wei Han ◽  
Binbin Liu
Keyword(s):  
Electron Transfer ◽  
Transfer Process ◽  
Functional Group ◽  
Ambient Air ◽  
Single Electron Transfer ◽  
Reductive Activation ◽  
Electron Transfer Process ◽  
Complex Molecules ◽  
Iron Catalysis ◽  
Oxidation Of Olefins

Compared with the widespread use of Pd-catalyzed Wacker-type oxidation of olefins, iron catalysis for this transformation is almost virgin territory. Our work on an iron-catalyzed Wacker-type oxidation through reductive activation of dioxygen is discussed here. This novel single-electron-transfer process not only addresses the issues of the Pd-catalyzed two-electron Wacker-type oxidation, but also possesses unprecedented functional-group tolerance and chemoselectivity. Importantly, the catalytic system uses ambient air as the sole oxidant, and it permits late-stage oxidations of complex molecules.

Visible-light-induced phenylchalcogenyl-oxygenation of allenes having aryl or electron withdrawing substituents with ambient air as a sole oxidant

2016 ◽  
Vol 14 (48) ◽  
pp. 11415-11425 ◽  
Author(s):  
Gullapalli Kumaraswamy ◽  
Swargam Vijaykumar ◽  
Kukkadapu Ankamma ◽  
Vykunthapu Narayanarao
Keyword(s):  
Electron Transfer ◽  
Visible Light ◽  
Transfer Process ◽  
Stereoselective Synthesis ◽  
Ambient Air ◽  
Single Electron ◽  
Single Electron Transfer ◽  
Electron Transfer Process ◽  
Electron Withdrawing Substituents

The stereoselective synthesis of α-phenylselenyl- or telluryl β-aryl acrylaldehydes/ketones from aryl allenes/1,3-diarylallene by an oxidative photo-induced single electron transfer process using benign ambient air as a sole oxidant was achieved.

Thionine–graphene oxide covalent hybrid and its interaction with light

2017 ◽  
Vol 19 (22) ◽  
pp. 14412-14423 ◽  
Author(s):  
Ewelina Krzyszkowska ◽  
Justyna Walkowiak-Kulikowska ◽  
Sven Stienen ◽  
Aleksandra Wojcik
Keyword(s):  
Electron Transfer ◽  
Graphene Oxide ◽  
Excited State ◽  
Transfer Process ◽  
Singlet Excited State ◽  
Functionalized Graphene ◽  
Electron Transfer Process ◽  
Functionalized Graphene Oxide ◽  
Back Electron Transfer

Quenching of the thionine singlet excited state in covalently functionalized graphene oxide with an efficient back electron transfer process.

scholarly journals Electrokinetic and Impedimetric Dynamics of FeCo-Nanoparticles on Glassy Carbon Electrode

Nano Hybrids ◽  
2013 ◽  
Vol 3 ◽  
pp. 1-23 ◽  
Author(s):  
Chinwe O. Ikpo ◽  
Njagi Njomo ◽  
Kenneth I. Ozoemena ◽  
Tesfaye Waryo ◽  
Rasaq A. Olowu ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Transfer Process ◽  
Dimethyl Carbonate ◽  
Electrochemical Impedance ◽  
Ethylene Carbonate ◽  
Carbon Electrode ◽  
Electron Transfer Process ◽  
Feco Nanoparticles

The electrochemical dynamics of a film of FeCo nanoparticles were studied on a glassy carbon electrode (GCE). The film was found to be electroactive in 1 M LiClO4 containing 1:1 v/v ethylene carbonate dimethyl carbonate electrolyte system. Cyclic voltammetric experiments revealed a diffusion-controlled electron transfer process on the GCE/FeCo electrode surface. Further interrogation on the electrochemical properties of the FeCo nanoelectrode in an oxygen saturated 1 M LiClO4 containing 1:1 v/v ethylene-carbonate-dimethyl carbonate revealed that the nanoelectrode showed good response towards the electro-catalytic reduction of molecular oxygen with a Tafel slope of about 120 mV which is close to the theoretical 118 mV for a single electron transfer process in the rate limiting step; and a transfer coefficient (α) of 0.49. The heterogeneous rate constant of electron transfer (ket), exchange current density (io) and time constant (τ) were calculated from data obtained from electrochemical impedance spectroscopy and found to have values of 2.3 x 10-5 cm s-1, 1.6 x 10-4 A cm-2 and 2.4 x 10-4 s rad-1, respectively.

Sign in / Sign up

Export Citation Format

Share Document