Results 131 to 140 of about 104,551 (278)

Visible Light-Mediated Monofluoromethylation/Acylation of Olefins by Dual Organo-Catalysis

Molecules
Monofluoromethyl (CH2F) motifs exhibit unique bioactivities and are considered privileged units in drug discovery. The radical monofluoromethylative difunctionalization of alkenes stands out as an appealing approach to access CH2F-containing compounds ...
Jiuli Xia, Yunliang Guo, Zhiguang Lv, Jiaqiong Sun, Guangfan Zheng, Qian Zhang   +5 more
doaj   +1 more source

High quality anti-relaxation coating material for alkali atom vapor cells

, 2009
We present an experimental investigation of alkali atom vapor cells coated with a high quality anti-relaxation coating material based on alkenes. The prepared cells with single compound alkene based coating showed the longest spin relaxation times which ...
Acosta, Alexandrov, Alexandrov, Balabas, Balabas, Beletskaya, Budker, Budker, Cviklinski, E. S. Polzik, Franzen, Graf, H. Krauter, J. H. Müller, Jackson Kimball, Julsgaard, K. Jensen, Karaulanov, Kuzmich, L. S. Madsen, Liberman, M. V. Balabas, Sherson, T. Fernholz, W. Wasilewski, Weiss   +25 more
core   +1 more source

Dibenzazepin‐verbrückte Netzwerk‐Polymer‐Phthalocyanine als abbaubare heterogene Photokatalysatoren

Angewandte Chemie, EarlyView.
Photodynamische Dibenzazepin‐Brücke wurde in Zink‐ und Kobalt‐Netzwerk‐Polymer‐Phthalocyanine (NP‐Pcs) eingeführt, um abbaubare heterogene Photokatalysatoren zu erhalten. Zum ersten Mal spielt die Bestrahlung mit Licht eine Schlüsselrolle beim „Design, der Verwendung und dem Abbau” von NP‐Pcs.
Erem Ahmetali, Azra Kocaarslan, Vanessa Trouillet, Stefan Heißler, Stefan Bräse   +4 more
wiley   +1 more source

The gas-phase chemistry of carbon chains in dark cloud chemical models

, 2013
We review the reactions between carbon chain molecules and radicals, namely Cn, CnH, CnH2, C2n+1O, CnN, HC2n+1N, with C, N and O atoms. Rate constants and branching ratios for these processes have been re-evaluated using experimental and theoretical ...
Bergeat, Astrid, Hickson, Kevin M., Loison, Jean-Christophe, Mereau, Raphael, Wakelam, Valentine   +4 more
core   +3 more sources

Photoenzymatic Hydroalkylation Enables Streamlined Access to Aryl Glutarimide Precursors

Angewandte Chemie, EarlyView.
We report a photoenzymatic hydroalkylation that enables streamlined, stereocontrolled access to aryl glutarimide precursors relevant to targeted protein degradation. Engineered flavin‐dependent “ene”‐reductases provide broad scope and high enantioselectivity through a distinct electron transfer–enantioselective proton transfer pathway.
Zhi Xu, Prasun Mukherjee, Steven Gossert, Stephen Thomas, Vasil H. Vasilev, Eric R. Welin, Yichen Tan, Shane M. McKenna, Megan A. Emmanuel, Todd K. Hyster   +9 more
wiley   +2 more sources

An environmentally friendly preparation of iodohydrins from alkenes mediated by clay-minerals

Journal of the Brazilian Chemical Society, 2004
Iodohydrins are useful intermediates in organic synthesis for the preparation of epoxides. Herein is reported the preparation of iodohydrins in good yields by the reaction of alkenes (ciclohexene, styrene, a-methylstyrene, and 1-octene) with iodine and ...
Villegas Raul A. S, Aguiar Mônica R. M. P. de, Mattos Marcio C. S. de, Guarino Alcides W. S, Barbosa Lilian M, Assumpção Luiz Carlos F. N   +5 more
doaj  

Mechanisms for the Oxonolysis of Ethene and Propene: Reliability of Quantum Chemical Predictions [PDF]

, 2003
Reactions of ozone with ethene and propene leading to primary ozonide (concerted and stepwise ozonolysis) or epoxide and singlet molecular oxygen (partial ozonolysis) are studied theoretically.
Chan, Wai-To, Hamilton, Ian P.
core   +1 more source

Total Synthesis of the Spirocyclic Bis‐Indole Alkaloid (−)‐Owerreine via a [4+2] Annulation

Angewandte Chemie, EarlyView.
The total synthesis of the bis‐indole alkaloid (−)‐owerreine has been accomplished by a diastereoselective [4+2] annulation between an enamine and an α,β−unsaturated indolenine precursor to form the 3‐spirocyclic tetrahydropyridine linkage of the natural product. DFT calculations allow an understanding of the mechanism of the key annulation.
Elisa Coll, Vincent Gandon, Cyrille Kouklovsky, Laurent Evanno, Guillaume Vincent   +4 more
wiley   +2 more sources

A Convenient, Safe, and Atom‐Economical Route to a Large Portfolio of Grubbs‐Type Catalysts for Olefin Metathesis via Four‐Coordinate Ruthenium Alkylidynes

Angewandte Chemie, EarlyView.
It may seem counterintuitive to first target a ruthenium alkylidyne when Grubbs‐type ruthenium carbene complexes are the actual goal. In the end, however, this tactic pays valuable dividends in terms of practicality, atom economy, flexibility as well as safety: the new route provides ready access to a large assortment of catalysts for alkene metathesis
Mingxu Cui, Alois Fürstner
wiley   +2 more sources

Rewriting Alkene Frameworks: A Practical Strategy for Nitrogen Incorporation

ChemistryEurope
Expanding the reach of skeletal editing to unactivated hydrocarbons presents a formidable challenge in nitrogen incorporation chemistry. In a recent advance, Morandi and coworkers have developed a direct, metal‐free strategy to insert nitrogen into ...
Ranjini Laskar, Frank Glorius
doaj   +1 more source