Results 31 to 40 of about 596,435 (207)

Metal-Free Organocatalysis [PDF]

Catalysts, 2018
Fostering research in fundamental organic transformations is of utmost importance for the development of science.[...]
openaire   +3 more sources

Effects of Varying the Three-Body Molecular Hydrogen Formation Rate in Primordial Star Formation [PDF]

, 2010
The transformation of atomic hydrogen to molecular hydrogen through three-body reactions is a crucial stage in the collapse of primordial, metal-free halos, where the first generation of stars (Population III stars) in the Universe are formed.
/Garching, Max Planck Inst. Plasmaphys., /KIPAC, Menlo Park /ZAH, Heidelberg /KIPAC, Menlo Park, /San Diego, CASS, /Texas U., Astron. Dept., /ZAH, Heidelberg, Abel, Tom, Bromm, Volker, Clark, Paul, Glover, S.C.O., Greif, T.H., Klessen, Ralf, Turk, Matthew J.   +11 more
core   +3 more sources

Metal-Free Regiodivergent Addition of Carbon Nucleophiles to α,β-Unsaturated Electrophiles

Molecules, 2017
A mild and metal-free regiodivergent addition of carbon nucleophiles to α,β-unsaturated electrophiles was developed. Total 1,2-regioselectivity was observed in the addition of nitrobenzyl chloride derivative 1 to α,β-unsaturated aldehydes 2 in the ...
Cédric Spitz, Alain G. Giuglio-Tonolo, Thierry Terme, Patrice Vanelle   +3 more
doaj   +1 more source

Ab initio Simulation of Optical Limiting: The Case of Metal-Free Phthalocyanine [PDF]

, 2014
We present a fully ab initio, non-perturbative description of the optical limiting properties of a metal-free phthalocyanine, by simulating the effects of a broadband electric field of increasing intensity.
Cocchi, Caterina, Molinari, Elisa, Prezzi, Deborah, Rozzi, Carlo A., Ruini, Alice   +4 more
core   +2 more sources

Metal-Free Aminohalogenation of Quinones With Alkylamines and NXS at Room Temperature

Frontiers in Chemistry, 2022
A simple and practical strategy for intermolecular aminohalogenation of quinone with alkyl amines and NXS was developed, in which haloamines generated in situ were employed as bifunctional reagents.
Jia Li, Yu-An Li, Ge Wu, Xu Zhang
doaj   +1 more source

On the properties of massive Population III stars and metal-free stellar populations [PDF]

, 2001
We present realistic models for massive Population III stars and stellar populations based on non-LTE model atmospheres, recent stellar evolution tracks and up-to-date evolutionary synthesis models, to study their spectral properties, including their ...
Abel, Abel, Abia, Baraffe, Barkana, Bond, Bromm, Bromm, Cerviño, Chiosi, Ciardi, Ciardi, Clegg, Cojazzi, D. Schaerer, de Koter, Dove, El Eid, Elvis, Ezer, Ferrara, Gabler, Giroux, Glazebrook, Gnedin, Haiman, Hillier, Hubeny, Hubeny, Husfeld, Izotov, Kennicutt, Klapp, Leitherer, Loeb, MacFarlane, MacLow, Madau, Marigo, Miralda-Escudé, Nakamura, Nakamura, Ober, Oh, Rackavy, Rybicki, Savaglio, Schaerer, Schaerer, Schaerer, Schaerer, Schaller, Schmutz, Songaila, Steidel, Storey, Tegmark, Tenorio-Tagle, Todini, Tumlinson, Tumlinson, Uehara, Woosley, Yoshii, Zheng   +64 more
core   +2 more sources

Visible-Light-Induced Singlet Oxygen-Promoted Arylation and Alkylation of Quinoxalin-2(1H)-ones and Quinolines

Molecules
We report a green and efficient visible-light-driven method for the arylation and alkylation of quinoxalin-2(1H)-ones and quinolines. This catalyst-free process utilizes air as the oxidant, offering mild reaction conditions, environmental sustainability,
Renjun Tan, Hequn Yang, Min Jiang, Peijun Song   +3 more
doaj   +1 more source

Recent Advances in Metal-Free Quinoline Synthesis

Molecules, 2016
The quinoline ring system is one of the most ubiquitous heterocycles in the fields of medicinal and industrial chemistry, forming the scaffold for compounds of great significance.
Ginelle A. Ramann, Bryan J. Cowen
doaj   +1 more source

Recent Advances and Challenges in 2D Metal-Free Electrocatalysts for N2 Fixation

Frontiers in Chemistry, 2020
The ever-growing requirement of ammonia for industry and energy supply motivates people to find clean and cost-effective alternatives to overcome the shortcomings of the century-old Haber-Bosch process. Electrocatalytic N2 reduction (NRR) is considered a
Xinyuan Xia, Bin Li, Shanshan Liu, Bo Tang   +3 more
doaj   +1 more source

Metal-Free Phosphated Mesoporous SiO₂ as Catalyst for the Low-Temperature Conversion of SO₂ to H₂S in Hydrogen

Nanomaterials, 2021
Highly active metal-free mesoporous phosphated silica was synthesized by a two-step process and used as a SO2 hydrogenation catalyst. With the assistance of a microwave, MCM-41 was obtained within a 10 min heating process at 180 °C, then a low ratio of P
Xinnan Lu, Safa Gaber, Mark A. Baker, Steven J. Hinder, Kyriaki Polychronopoulou   +4 more
doaj   +1 more source