Results 61 to 70 of about 82,167 (149)
Estudos de fluorescencia em organo-gel [PDF]
, 1997 Dissertação (Mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas.Um novo campo de estudo tem sido aberto com a solubilização de gelatina em microemulsão água em óleo. O sistema MBG é formado por Aerosol-OT, água e
Souza, Donizete de
core
Prins fluorination cyclisations: Preparation of 4-fluoro-pyran and -piperidine heterocycles
Beilstein Journal of Organic Chemistry, 2010 The Prins reaction was investigated using BF3·OEt2 as a Lewis acid. It has been recently demonstrated, that if BF3·OEt2 is used in stoichiometric amounts then these reactions generate fluorinated products where the BF3·OEt2 contributes fluoride ion to ...
Guillaume G. Launay +2 more
doaj +1 more source
A Review on Green Synthetic Approaches in the Development of Quinoline Analogues
ChemistrySelect, Volume 11, Issue 33, 1 September 2026.This review highlights recent advances in environmentally friendly approaches, including metal‐free systems, solvent‐free approaches, microwave, and ultrasonic‐assisted techniques, organo‐ and biocatalysis, ionic liquids, nanoparticle catalysis, electrochemical, and photocatalytic strategies for the synthesis of quinoline scaffolds.
Demis Zelelew +3 more
wiley +1 more source
Reaction of 2,2,4,4-tetrakis(trifluoromethyl)-1,3-dithiethane with N-vinyl compounds
Beilstein Journal of Organic Chemistry, 2013 The reaction of hexafluorothioacetone dimer (2,2,4,4-tetrakis(trifluoromethyl)-1,3-dithiethane, 1) with vinylamides leads to the rapid formation of [2 + 2] cycloadducts: 4-amino-2,2-bis(trifluoromethyl)thietanes.
Viacheslav A. Petrov, Will Marshall
doaj +1 more source
Chemistry – A European Journal, Volume 32, Issue 28, 25 July 2026.Why add another catalyst when the product itself holds the power to catalyze its own formation? Autocatalysis in synthetic chemistry enhances reaction efficiency and uncovers novel catalytic behavior across both closed‐shell and open‐shell systems, expanding reactivity and enabling innovative design strategies.
Jaspreet Kaur, Joshua P. Barham
wiley +1 more source
Fluorine polymer probes for magnetic resonance imaging: quo vadis?
, 2019 Over the last few years, the development and relevance of F-19 magnetic resonance imaging (MRI) for use in clinical practice has emerged. MRI using fluorinated probes enables the achievement of a specific signal with high contrast in MRI images. However,
Babuka, David +4 more
core +1 more source
Beilstein Journal of Organic Chemistry, 2014 The synthesis of 5-nitro-1-(trifluoromethyl)-3H-1λ3,2-benziodaoxol-3-one (3), a hypervalent-iodine-based electrophilic trifluoromethylating reagent, is described.
Nico Santschi +4 more
doaj +1 more source
The influence of fluorine substitution on some enzyme mediated reactions [PDF]
, 1997 The replacement of a hydrogen or hydroxy group with a fluorine atom is a popular strategy to alter the activity of biologically important molecules, as their similar sizes mean that such a replacement has little steric impact.
Bridge, Colin Francis
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One-pot cross-enyne metathesis (CEYM)–Diels–Alder reaction of gem-difluoropropargylic alkynes
Beilstein Journal of Organic Chemistry, 2013 Propargylic difluorides 1 were used as starting substrates in a combination of cross-enyne metathesis and Diels–Alder reactions. Thus, the reaction of 1 with ethylene in the presence of 2nd generation Hoveyda–Grubbs catalyst generates a diene moiety ...
Santos Fustero +5 more
doaj +1 more source
Beilstein Journal of Organic Chemistry, 2013 The cross-coupling reactions of 2,2-difluoro-1-iodoethenyl tosylate (2) with 2 equiv of boronic acids in the presence of catalytic amounts of Pd(OAc)2 and Na2CO3 afforded the mono-coupled products 3 and 5 in high yields.
Ju Hee Kim, Su Jeong Choi, In Howa Jeong
doaj +1 more source