Neutral-Eosin Y-Catalyzed Regioselective Hydroacylation of Aryl Alkenes under Visible-Light Irradiation

Synlett ◽  
2020 ◽  
Author(s):  
Xinxin Tang ◽  
Jie Wu ◽  
Haiwang Liu ◽  
Fei Xue ◽  
Mu Wang
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Hydrogen Atom Transfer ◽  
Light Irradiation ◽  
Eosin Y ◽  
Acyl Radical ◽  
Radical Intermediate ◽  
Styrene Derivatives ◽  
High Yields ◽  
Subsequent Addition

AbstractStyrene derivatives were hydroacylated with exclusive anti-Markovnikov selectivity by using neutral eosin Y as a direct hydrogen-atom-transfer (HAT) catalyst under visible-light irradiation. Aldehydes and styrenes with various substituents were tolerated (>20 examples), giving the corresponding products in moderate to high yields. The key acyl radical intermediate was generated from a direct HAT process induced by photoexcited eosin Y. Subsequent addition to styrenes and a reverse HAT process generated the ketone products.

A photo-auxiliary approach – enabling excited state classical phototransformations with metal free visible light irradiation

2017 ◽  
Vol 53 (10) ◽  
pp. 1692-1695 ◽  
Author(s):  
Akila Iyer ◽  
Steffen Jockusch ◽  
Jayaraman Sivaguru
Keyword(s):  
Excited State ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Uv Light ◽  
Light Irradiation ◽  
Metal Free ◽  
High Yields

To address the problem of using UV light to initiate traditional photoreactions, hydrazide based chromophores are evaluated as a “photo-auxiliary“ with visible light using a metal free photocatalyst to afford photoproducts in high yields.

Metal free visible light driven oxidation of alcohols to carbonyl derivatives using 3,6-di(pyridin-2-yl)-1,2,4,5-tetrazine (pytz) as catalyst

RSC Advances ◽  
2015 ◽  
Vol 5 (102) ◽  
pp. 84328-84333 ◽  
Author(s):  
Suvendu Samanta ◽  
Papu Biswas
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Room Temperature ◽  
Light Irradiation ◽  
Metal Free ◽  
Carbonyl Derivatives ◽  
Oxidation Of Alcohols ◽  
Visible Light Driven ◽  
High Yields

A metal-free transformation of alcohols to the corresponding carbonyls in high yields under visible-light irradiation has been achieved at room temperature using di(pyridin-2-yl)-1,2,4,5-tetrazine (pytz) as catalyst.

Highly active dye-sensitized photocatalytic H2 evolution catalyzed by a single-atom Pt cocatalyst anchored onto g-C3N4 nanosheets under long-wavelength visible light irradiation

2018 ◽  
Vol 42 (17) ◽  
pp. 14083-14086 ◽  
Author(s):  
Yuan Xue ◽  
Yonggang Lei ◽  
Xiangyu Liu ◽  
Yanan Li ◽  
Wanan Deng ◽  
...  
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Single Atom ◽  
Eosin Y ◽  
H2 Evolution ◽  
Long Wavelength ◽  
Dye Sensitized ◽  
Highly Active ◽  
Photocatalytic H2 Evolution

A single-atom Pt cocatalyst anchored onto g-C3N4 nanosheets could efficiently catalyze H2 evolution from an Eosin Y-sensitized system under 520 nm irradiation.

Hydrogen Production over Eosin Y-Sensitized Pt-Loaded Layered Lanthanum Niobate under Visible Light Irradiation

2013 ◽  
Vol 815 ◽  
pp. 567-573
Author(s):  
Xiao Pei Zhang ◽  
Yue Lin Wei ◽  
Shu Hong Chen ◽  
Jing Xu ◽  
Huang Zhao ◽  
...  
Keyword(s):  
Visible Light ◽  
Hydrogen Evolution ◽  
Visible Light Irradiation ◽  
Hydrogen Generation ◽  
Energy Dispersive Spectrometer ◽  
Light Irradiation ◽  
Eosin Y ◽  
X Ray Diffraction ◽  
Dye Sensitization ◽  
X Ray

A novel and highly efficient photocatalyst, Eosin Y-sensitized Pt-intercalated nanotube Pt/HLa Nb2O7, was found to be very active for hydrogen generation within triethanolamine (TEOA) solution as the electron donor under visible-light irradiation (λ420 nm). The photocatalysts were characterized by X-ray diffraction (XRD), UV-vis diffuse reflectance spectra (DRS), scan electron microscope (SEM) and energy dispersive spectrometer (EDS). The results showed that the significant enhancement of photocatalytic activity was achieved via Pt intercalating and subsequent dye sensitization of Pt/HLaNb2O7. The highest rate for hydrogen evolution was 4.45 mmol·g-1·h-1under irradiation with a wavelength longer than 420 nm, and the probable mechanism of photosensitized hydrogen evolution have also been discussed.

scholarly journals Carbon nitride creates thioamides in high yields by the photocatalytic Kindler reaction

2018 ◽  
Vol 20 (4) ◽  
pp. 838-842 ◽  
Author(s):  
B. Kurpil ◽  
B. Kumru ◽  
T. Heil ◽  
M. Antonietti ◽  
A. Savateev
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Carbon Nitride ◽  
Elemental Sulfur ◽  
Bond Formation ◽  
Building Blocks ◽  
Light Irradiation ◽  
High Yields

Potassium poly(heptazine imide), a carbon nitride based photocatalyst, effectively promotes the Kindler reaction of thioamide bond formation using amines and elemental sulfur as building blocks under visible light irradiation.

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