Results 21 to 30 of about 46,039,222 (155)

Ambient Hydrocarbonylation of Olefins Enabled by Visible-Light. [PDF]

Adv Sci (Weinh)
A novel photo‐induced methodology for hydrocarbonylation has been established, resolving the inherent conflicts between competitive olefin and CO insertion in traditional methods that necessitate harsh conditions. Accordingly, an efficient and versatile hydrocarbonylation of olefins enabled by visible‐light irradiation under ambient conditions has been
Liu H, Zhang T, Huang H.
europepmc   +2 more sources

Spatial arrangement of block copolymer nanopatterns using a photoactive homopolymer substrate. [PDF]

Nanoscale Adv, 2019
Spatial control of the orientation of block copolymers (BCPs) in thin films offers enormous opportunities for practical nanolithography applications. In this study, we demonstrate the use of a substrate comprised of poly(4-acetoxystyrene) to spatially ...
Jiang Z, Alam MM, Cheng HH, Blakey I, Whittaker AK.   +4 more
europepmc   +2 more sources

Synthesis of Poly(4-hydroxystyrene) for Photoresist: Nitroxide-Mediated Polymerization and Homogeneous Acidic Hydrolysis. [PDF]

ACS Omega
The growing demand for high-precision chemical materials has intensified the need for stringent control over polymer structures in advanced photolithography. Poly(4-hydroxystyrene) (P(pHS)) is a key base polymer for chemically amplified photoresists. Its
Lee J, Kim DG, Park S, Kim H, Lee W, Lim J, Kim J, Ryu DY, Kim T, Chae CG.   +9 more
europepmc   +2 more sources

Photocatalysis Enables Chemodivergent Radical Polar Crossover: Ritter-Type Amidation vs Heck-Type Olefin Carbofunctionalizations. [PDF]

Chemistry
One aryl makes the difference: switching styrenes with 1,1‐diaryl olefins as radical acceptors, the benzylic cation intermediate fate changes from Ritter‐type carboamidation to Heck‐type reaction. The decarboxylative photocatalytic chemodivergent methodology enabled broad scope and efficient scalability in both batch and flow.
Lepori M, Pratley C, Dey I, Butera V, Roider V, Barham JP.   +5 more
europepmc   +2 more sources

Atomic Scale Engineering of Multivalence-State Palladium Photocatalyst for Transfer Hydrogenation with Water as a Proton Source. [PDF]

Adv Mater
Photocatalytic transfer hydrogenation is achieved over a multivalence‐state palladium photocatalyst, in which protons generated from photocatalytic water splitting are added to unsaturated double bonds. The operando light‐induced Electron Paramagnetic Resonance (EPR) spectroscopy confirms the synergistic action between Pd single atoms and nanoparticles,
Zhao E, Kong W, Zoppellaro G, Yang Y, Nan B, Li L, Zhang W, Chen Z, Bakandritsos A, Wang ZJ, Beller M, Zbořil R, Chen Z.   +12 more
europepmc   +2 more sources

Blue‐Light Driven Iron‐Catalyzed Oxy‐phosphinylation of Activated Alkenes for β‐Ketophosphine Oxide Synthesis

Chemistry – A European Journal, Volume 29, Issue 69, December 11, 2023., 2023
A blue light driven iron‐catalyzed oxy‐phosphinylation of activated alkenes with secondary phosphine oxides under air at room temperature led to β‐ketophosphine oxides in 43–97 % isolated yields. The proposed mechanism involved a blue light promoted aerobic process catalyzed by iron which generated a phosphorus radical from the starting secondary ...
Yumeng Yuan, Qiufeng Huang, Christophe Darcel   +2 more
wiley   +1 more source

Influence of different ester side groups in polymers on the vapor phase infiltration with trimethyl aluminum [PDF]

, 2022
The vapor phase infiltration (VPI) process of trimethyl aluminum (TMA) into poly(4-acetoxystyrene) (POAcSt), poly(nonyl methacrylate) (PNMA) and poly(tert-butyl methacrylate) (PtBMA) is reported.
Loos, Katja; id_orcid, Devi, Anjana, Maniar, Dina; id_orcid, Kühne, Thomas D., Mai, Lukas, Schöbel, Judith, Zysk, Frederik, Anjana Devi, Judith Schöbel, Dina Maniar, Thomas D. Kühne, Katja Loos, Frederik Zysk, Lukas Mai   +13 more
core   +1 more source

Architectural control of polystyrene physical properties using branched anionic polymerization initiated at ambient temperature

Journal of Polymer Science, Volume 58, Issue 10, Page 1426-1438, May 15, 2020., 2020
Ambient temperature‐initiated anionic polymerization of styrene has been used to generate polymers of varying molecular weights and architectures. The branched polystyrenes did not show a conventional Tg versus molecular weight relationship and analyses have shown a strong correlation to the degree of polymerization of the component chains and position
Tamara Alhilfi, Pierre Chambon, Steve P. Rannard   +2 more
wiley   +1 more source

trans-Ethylenedi-p-phenylene diacetate

, 2009
The centrosymmetric title compound, C18H26O4, was prepared in high yield from 4-acetoxystyrene via Ru-catalysed homo-olefin metathesis. Exclusive formation of the E-configurated isomer was observed.
Stefanie Ritter, Janna Velder, Jörg-M. Neudörfl, Hans-Günther Schmalz   +3 more
core   +1 more source

Visible Light‐Induced Three‐Component 1,2‐Acylarylation of Quinoxalin‐2(1H)‐Ones with Styrenes and Oxime Esters

Advanced Synthesis &Catalysis, Volume 368, Issue 12, 17 June 2026.
An additive‐free visible light–induced three‐component 1,2‐acylarylation of quinoxalin‐2(1H)‐ones was developed using styrenes and acyl oxime esters under purple LED irradiation. Visible light‐driven transformations offer an attractive strategy for sustainable synthesis by simplifying reaction systems while maintaining high efficiency.
Sudip Sau, Rahulkumar Patel, Shinobu Takizawa, Hun Young Kim, Kyungsoo Oh   +4 more
wiley   +1 more source