Results 71 to 80 of about 22,841 (254)

Late‐Stage Functionalization of Peptides on the Solid Phase

Angewandte Chemie International Edition, EarlyView.
Peptide modifications are essential to control pharmacodynamic and pharmacokinetic properties of peptide drugs. Consequently, strategies that allow for efficient and rapid incorporation of non‐canonical modifications into peptides in parallel formats are highly sought after.
Marius Werner, Truc Lam Pham, Franziska Thomas   +2 more
wiley   +1 more source

Synthesis of Pyridinium Moiety Containing Triazolyl Purines

Molbank
Pyridinium salts of 2-piperidinyl-6-triazolylpurine derivatives were obtained by the introduction of pyridinium moieties into the propane-1,3-diol fragment at the N(9) position of purine to enhance the solubility of 2-amino-6-triazolylpurine derivatives ...
Aleksejs Burcevs, Māris Turks, Irina Novosjolova   +2 more
doaj   +1 more source

Effect of some pyridinium based compounds on the hydrolysis of carboxylate ester

, 2012
611-616Nucleophilic reactivity of some pyridinium based compounds towards hydrolysis of p-nitrophenyl acetate (PNPA) has been studied at pH 9.0 and temperature 27ºC.
Singh, Namrata, Ghosh, Kallol K
core  

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

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

Chlorination of Pyridinium Compounds [PDF]

Journal of Biological Chemistry, 2000
Kathleen M. Daumer, Ahsan U. Khan, Marla J. Steinbeck   +2 more
openaire   +1 more source

Síntese de cristais líquidos isônicos e/ou discóticos contendo os heterociclos 1,2,4- E 1,3,4- oxadiazol [PDF]

, 2013
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas, Programa de Pós-Graduação em Química, Florianópolis, 2013.A presente dissertacao traz o estudo realizado com moleculas derivadas dos heterociclos 1,
Silva, Danilo Henrique da
core  

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

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