Results 21 to 30 of about 30,087 (242)
STUDIES ON PLANT BILE PIGMENTS-6. PHOTOCHEMICALLY ASSISTED REACTION OF A-DIHYDROBILINDIONE WITH NUCLEOPHILES AS A MODEL FOR PHYTOCHROME INTERCONVERSION [PDF]
, 1979 From the A-dihydrobilindione 3. the pyridinium derivatives 6a,b and analogues thereof have been obtained by a formal nucleophilic substitution. The reaction is rationalized as a photochemically assisted oxidation of 3 with a subsequent regioselective ...
Bubenzer, C. +2 more
core +1 more source
Asymmetric Hydrogenation of 3‐Substituted Pyridinium Salts
Chemistry – A European Journal, 2016 AbstractThe use of an equivalent amount of an organic base leads to high enantiomeric excess in the asymmetric hydrogenation of N‐benzylated 3‐substituted pyridinium salts into the corresponding piperidines. Indeed, in the presence of Et3N, a Rh‐JosiPhos catalyst reduced a range of pyridinium salts with ee values up to 90 %.
M. Renom-Carrasco +6 more
openaire +4 more sources
2-[(Pyridin-2-yl)amino]pyridinium 2,4,6-trinitrophenolate
Acta Crystallographica Section E, 2014 In the cation of the title salt, C10H10N3+·C6H2N3O7−, the pyridine and pyridinium rings are linked by an intramolecular N—H...N hydrogen bond and are approximately coplanar, with a dihedral angle between their planes of 4.24 (6)°.
Kateryna A. Ohui +2 more
doaj +1 more source
A Synthetic Route to Quaternary Pyridinium Salt-Functionalized Silsesquioxanes
International Journal of Polymer Science, 2012 A synthetic route to potentially biocidal silsesquioxanes functionalized by quaternary pyridinium functionalities has been developed. N-Alkylation reactions of the precursor compounds 4-(2-(trimethoxysilyl)ethyl)-pyridine (5) and 4-(2-trichloro ...
Nataliya Kostenko +3 more
doaj +1 more source
4,4′-(o-Phenylenedioxydimethylene)dipyridinium dinitrate
Acta Crystallographica Section E, 2009 The cation of the salt, C18H18N2O22+·2NO3−, lies about a twofold rotation axis. The pyridinium ring is almost coplanar with the phenylene ring [dihedral angle between rings = 5.69 (9)°].
Ping Zou +4 more
doaj +1 more source
Pyridinium-catalyzed decarboxylative borylation of benzoyl peroxides
Green Synthesis and Catalysis, 2021 A pyridinium salt catalyzed radical borylation of benzoyl peroxides is reported herein. A range of benzoyl peroxides having different electronic properties were well compatible in this borylation reaction, delivering various arylboronates in good yields ...
Shuxian Zhu +4 more
doaj +1 more source
Development of a novel, multifunctional, membrane-interactive pyridinium salt with potent anticancer activity [PDF]
The synthesis and biological evaluation of a novel pyridinium salt is reported. Initial membrane interaction with isolated phospholipid monolayers was obtained with the pyridinium salt, and two neutral analogues for comparison, and the anticancer effects
Dennison, Sarah Rachel +5 more
core +1 more source
Synthesis of a New Bioconjugate Steroid Pyridinium Salt Derived from Allopregnanolone Acetate
MolbankBecause allopregnanolone and derivatives represent biologically active molecules, in this letter, we present the synthesis of a new bioconjugate steroid pyridinium salt derived from allopregnanolone in three steps.
Hisami Rodríguez-Matsui +5 more
doaj +1 more source
Acta Crystallographica Section E: Crystallographic Communications, 2015 In the title hydrated salt, C13H10Cl2N3O+·Cl−·3H2O, the organic cation exhibits a dihedral angle of 8.26 (14)° between the mean planes of the pyridinium and benzene rings, and dihedral angles of 8.70 (15) and 15.93 (5)° between the mean planes of the ...
J. Josephine Novina +3 more
doaj +1 more source
Direct methane conversion to methanol by ionic liquid-dissolved platinum catalysts [PDF]
, 2006 Ternary systems of inorganic Pt salts and oxides, ionic liquids and concentrated sulfuric acid are effective at catalyzing the direct, selective oxidation of methane to methanol and appear to be more water tolerant than the Catalytica ...
Cheng, Jihong +3 more
core +2 more sources