Results 201 to 210 of about 16,017 (235)

Iridium‐Catalyzed Asymmetric Hydrogenation of Pyridinium Salts

Angewandte Chemie International Edition, 2012
As one of the most straightforward and powerful approaches for the preparation of optically active compounds, asymmetric hydrogenation has been successfully used for different types of aromatic compounds, including quinolines, isoquinolines, quinoxalines, indoles, pyrroles, furans, imidazoles, and aromatic carbocyclic ring, with excellent ...
Zhi-Shi, Ye, Mu-Wang, Chen, Qing-An, Chen, Lei, Shi, Ying, Duan, Yong-Gui, Zhou   +5 more
openaire   +2 more sources

Oxidation of reduced triphosphopyridine nucleotide by pyridinium salts

Archives of Biochemistry and Biophysics, 1967
Abstract Certain substituted pyridinium salts are able to support oxidation of TPNH. Ferredoxin, ferredoxin-TPN reductase, and molecular oxygen are necessary. water rather than Peroxide is formed, as shown by the stoichiometry of the reaction. During the Reaction the pyridinium salts do not undergo Spectral changes.
P, Böger, A, San Pietro
openaire   +2 more sources

VIBRATIONAL SPECTRA OF PYRIDINIUM SALTS

Canadian Journal of Chemistry, 1961
The vibrational spectrum of the pyridinium ion, C5H5NH+, and the N-deuterated species has been studied in several pyridinium salts. By comparison with benzene and deuterobenzene (with which the pyridinium ion is isoelectronic) a fairly complete assignment has been made. The N—H bonds, which are hydrogen bonded to the anions, have stretching vibrations
openaire   +1 more source

Azulene‐substituted pyridines and pyridinium salts. Synthesis and structure. 2. Azulene‐substituted pyridinium salts

Journal of Heterocyclic Chemistry, 2007
Abstractmagnified image4‐Azulen‐1‐yl substituted 2,6‐dimethyl‐and 2,6‐diphenyl‐pyridinium salts are obtained in yields between 50 % and 100 % in the reaction of corresponding 4‐azulen‐1‐yl‐pyranylim salts and various amines. The effects of amine structure and of substitution in the heterocycle or at azulene moieties on the synthesis have been ...
Alexandru C. Razus, Liviu Birzan, Claudia Pavel, Oana Lehadus, Andreea Corbu, Filip Chiraleu, Cristian Enache   +6 more
openaire   +1 more source

Pyridinium salts and dihydropyridines; mechanistic studies of the redox reaction between pyridinium salts and alkoxides in tetrahydrofuran

Journal of the Chemical Society, Perkin Transactions 2, 1977
A model system for NAD-dependent redox reactions has been designed in an attempt to assess the involvement of covalent adducts as intermediates. The system consists of 3-substituted 1-n-heptylpyridinium salts and substituted benzyl alkoxides. Although covalent adducts were found in the reaction mixture, studies of substituent effects and other ...
Alexander Shirra, Colin J. Suckling
openaire   +1 more source

Oxidative Diphosphonylation of 1,4-Dihydropyridines and Pyridinium Salts

Organic Letters, 2000
An oxidative double phosphonylation of dihydropyridines 1 and pyridinium salts 2 is achieved through the use of dialkyl phosphites, DDQ, and triethylamine. Acceptable to good yields of 2, 6-diphosphonylated-1,2-dihydropyridines 3 are obtained in a one-pot reaction involving tandem nucleophilic addition/oxidation processes.
, Lavilla, , Spada, , Bosch
openaire   +2 more sources

Syntheses Using Pyridinium Salts

Angewandte Chemie International Edition in English, 1963
AbstractThis review discusses syntheses leading to a new type of N‐vinylpyridinium salts, to novel anionocyanines, to aminophenazines and alloxazines, as well as to (aza‐) dehydroquinolizinium, acridizinium, and morphanthridizinium salts. In addition, Mannich reactions and aminoalkylations at active methylene groups of cycloimmonium salts, and their ...
openaire   +1 more source

ChemInform Abstract: Reactions of Pyridinium N‐Ylides and Their Related Pyridinium Salts

ChemInform, 2012
AbstractReview: 112 refs.
openaire   +1 more source

Redox reactions of pyridinium salts

Tetrahedron Letters, 1975
Alexander Shirra, Colin J. Suckling
openaire   +1 more source

Pyridinium and Quinolinium Salts

2012
D. Uraguchi, T. Ooi
openaire   +1 more source