Results 81 to 90 of about 41,751 (271)

Anodic Behaviour of Some Bispyridinium Oximes on a Glassy-Carbon Electrode

International Journal of Electrochemical Science, 2013
The electrochemical oxidation of selected bispyridinium oximes, including conventional oximes HI-6 [(1-(((4-carbamoylpyridinium-1-yl)methoxy)methyl)-2-((hydroxyimino)-methyl)pyridinium chloride] and TMB-4 [N,N'-(propano)bis(4-hydroxyiminomethyl ...
Ivana Novak, Šebojka Komorsky-Lovrić, Suzana Žunec, Ana Lucić Vrdoljak   +3 more
doaj   +1 more source

Asymmetric α‐Alkylation With Activated and Unactivated Electrophiles by a Highly Productive and Recyclable Lewis Acid/Imidazolium Catalyst

Angewandte Chemie International Edition, EarlyView.
An air‐stable, easily prepared, bifunctional Cu(II)/imidazolium complex enables highly enantioselective α‐alkylation of 1,3‐dicarbonyls with outstanding productivity (TON up to 1740). Highlights include broad electrophile scope spanning π‐activated and nonactivated reagents, stereo‐retentive allylation, simple catalyst synthesis, and efficient catalyst
Johanna Haußmann, Alexander Beck, Dominik Hornung, Michael Mistele, Alexander Allgaier, Wolfgang Frey, Joris van Slageren, Johannes Kästner, René Peters   +8 more
wiley   +1 more source

Synthesis of non-phosphorus ether glycerolipids containing a pyridinium ring.

Тонкие химические технологии, 2008
The synthesis of new non-phosphorus ether glycerolipids containing a pyridinium ring in a polar domain is described. Novel compounds possess high cytotoxic activity against human leukemia К562 and colon cancer HCT116 cell lines.
S. G. Romanov, V. G. Romanov, N. V. Pliavnik, G. A. Serebrennikova, A. A. Shtil   +4 more
doaj  

A Simple and Efficient Approach to the Synthesis of Endo and Exo Bicyclo[6.1.0]nona-3,5-diene-9-carboxaldehyde

Molecules, 2007
Monobromination of 1,5-cyclooctadiene, followed by cyclopropanation with ethyl diazoacetate, led to the formation of endo and exo ethyl 4,5-dibromobicyclo[6.1.0]nonane-9-carboxylates 3a and 3b. Bis-dehydrobromination of 3a and 3b using 1,8-diazabicyclo[5,
Gholamreza Mashayekhi, Mehdi Ghandi
doaj   +1 more source

Synthesis and characterization of a pyridinium IL-tagged Schiff base Pd(II)-complex: An efficient catalyst for the Suzuki reaction at room temperature under aerobic conditions

Results in Chemistry
To address some drawbacks associated with the Suzuki reaction herein we report a new pyridinium IL-tagged Schiff base Pd(II)-complex. First pyridinium IL was synthesized and condensed with salicylaldehyde to prepare a new IL-tagged Schiff base which on ...
Pranesh Rai, Biswajit Sinha
doaj   +1 more source

Selective detection of fluoride based on a pyridinium n-phenolate-calix[4]pyrrole displacement assay: an undergraduate laboratory experiment

Química Nova, 2014
A two-step experiment is proposed for a third year class in experimental organic chemistry. Over a period of five weeks, the students synthesized calix[4]pyrrole, a receptor that is highly selective for fluoride, and a pyridinium N-phenolate dye ...
Karina Mannrich, Marcelo Silva, Leandro G. Nandi, Celso R. Nicoleti, Vanderlei G. Machado   +4 more
doaj   +1 more source

4,4′-(Anthracene-9,10-diylbis(ethyne-2,1-diyl))bis(1-benzyl-1-pyridinium) Bromide

Molbank
Viologens, i.e., quaternary 4,4′-bipyridinum salts, are a well-known class of functional organic compounds that have attracted in the past few decades a great deal of attention for their peculiar chemical and electrochemical properties and have therefore
Valentina Novelli, Andrea D’Annibale, Fabrizio Casano, Alessandro Latini, Lorenza Romagnoli   +4 more
doaj   +1 more source

New Coordinative Compounds with 4-(4’-pyridyl)pyridinium Disubstituted Monoylides

Croatica Chemica Acta, 2015
The complexes with manganese(II), iron(II), cobalt(II), nickel(II) and copper(II) of 2-(4, 4’-bipyridin-1-ium-1-yl)-1-(4-bromophenylamino)-3-(4-methoxyphenyl)-3-oxo-1-thioxopropan-2-ide (ylide, Y) were synthesized and characterized.
Rodica Postolachi, Ramona Danac, Aurel Pui   +2 more
doaj   +1 more source

Overcrowded Alkene Photo‐Redox‐Switches Based on Quinolinium/Carbene Building Blocks

Angewandte Chemie International Edition, EarlyView.
A modular synthesis of a new class of photo‐ and redox‐switches is described based on the combination of quinolinium salts and carbenes. Photochemical switching allows to selectively switch between folded E/Z isomers, while electrochemical switching allows to change between neutral, radical cation and dicationic oxidation states, which are all isolable
Chris Burdenski, Patrick W. Antoni, Marcel E. Baumert, Leonie Ziemann, Samaresh C. Sau, Julian J. Holstein, Maria Castro, Nitin Kumar, Ofer Filiba, Igor Schapiro, Max M. Hansmann   +10 more
wiley   +1 more source

Syntheses and Properties of Salts of Chromophores with Ferrocenyl Electron Donor Groups and Quaternary Nitrogen Acceptors [PDF]

, 2009
A series of five new dipolar cations has been synthesized with ferrocenyl (Fc) electron donor groups connected to N-arylpyridinium, N-methylquinolinium, N-methylbenzothiazolium, or N-methylacridinium acceptors.
Brunschwig, Bruce S., Clays, Koen, Coe, Benjamin J., Docherty, Rebecca J., Foxon, Simon P., Franz, Edith, Harper, Elizabeth C., Helliwell, Madeleine, Raftery, James   +8 more
core   +1 more source