Results 91 to 100 of about 52,626 (269)

Pyridinium ylids in heterocyclic synthesis

, 2011
Pyridinium ylids are versatile tools in organic synthesis. The stability of pyridinium ylids and their generation is commented. This review gives an overview of the possible modes through which pyridinium ylids can react.
Jan Jacobs, Eva Van Hende, De Kimpe, Norbert, Sven Claessens, Van Hende, Eva, Norbert De Kimpe, Jacobs, Jan, Claessens, Sven   +7 more
core   +1 more source

Cooperative Al(Salen)-Pyridinium Catalysts for the Asymmetric Synthesis of <em>trans</em>-Configured β-Lactones by [2+2]-Cyclocondensation of Acylbromides and Aldehydes: Investigation of Pyridinium Substituent Effects

Molecules, 2012
The <em>trans</em>-selective catalytic asymmetric formation of β-lactones constitutes an attractive surrogate for <em>anti</em>-aldol additions.
René Peters, Katja Latendorf, Patrick Meier, Florian Broghammer, Guntram Rauhut   +4 more
doaj   +1 more source

New Constituents from the Korean Sponge Plakortis simplex

Marine Drugs, 2013
Six new cyclic peroxides (1–6) were isolated from the Korean sponge Plakortis simplex, along with two new alkylpyridinium alkaloids (7 and 8). The structures of these compounds were completely determined by a combination of NMR analysis and chemical ...
Ok-Hwa Kang, Buyng Su Hwang, Jung-Rae Rho, Dong-Yeul Kwon, Jung Soon Oh   +4 more
doaj   +1 more source

Reactivity of Halo(pyridinium)carbenes

, 2016
The reactivity of chloro- and fluoro(N-methyl-3-pyridinium)carbenes was examined by laser flash photolysis, where the halo(pyridinium)carbenes formed ylides with pyridine, acetonitrile, and acetone.
Reinaldo Moya-Barrios (2333677), Frances L. Cozens (2333680), Benjamin M. Fregeau (2333683)   +2 more
core   +1 more source

Pyridinium dichlorophosphinomethylides

Heteroatom Chemistry, 2001
AbstractSeven new pyridinium dichlorophosphinomethylides 2 have been obtained from dichlorophosphinylation of the pyridinium methylides generated in situ. 2 give 1,3‐bis(alkoxycarbonyl)‐2‐phosphaindolizines 4 through 1,5‐electrocyclization of the intermediate, bis(pyridinium ylidyl)phosphenium chloride 3 which is generated either from ...
Raj K. Bansal, Neelima Gupta, Mukta Baweja, Leena Hemrajani, Vimal K. Jain   +4 more
openaire   +1 more source

2-[5-(Pyridin-2-yl)-1,3,4-thiadiazol-2-yl]pyridin-1-ium perchlorate

IUCrData, 2017
The cation of the title molecular salt, C12H9N4S+·ClO4−, is approximately planar, with the pyridine and pyridinium rings being inclined to the central thiadiazole ring by 6.51 (9) and 9.13 (9)°, respectively.
Abdelhakim Laachir, Fouad Bentiss, Salaheddine Guesmi, Mohamed Saadi, Lahcen El Ammari   +4 more
doaj   +1 more source

Ionic Hydrogenation of Pyridinium and Azetidinium Cations [PDF]

, 2017
Research described herein seeks to study the reactivity of CpRu(P-P)H with pyridinium and azetidinium cations. For the former, we wish to determine if a previously established methodology for the regioselective reduction of a particular pyridinium ...
Yang, Zheren Jim
core   +1 more source

2-Aminopyridinium 2,4-dinitrophenolate

IUCrData, 2016
The asymmetric unit of the title organic salt, C5H7N2+·C6H3N2O5−, comprises two 2-aminopyridinium cations and two 2,4-dinitrophenolate anions. The cations are protonated at the pyridine N atoms, while the anions are deprotonated at hydroxyl O atoms.
S. Reena Devi, R. Akilan, R. Mohan Kumar, T. Ganesh, G. Chakkaravarthi   +4 more
doaj   +1 more source

Pyridinium chloride

, 2017
Inelastic Neutron Scattering spectrum of Pyridinium chloride, C₅H₆ClN, measured on the TFXA ...
C. B. Jasciezek, U. of Sussex, UK
core   +1 more source

Facile access to pyridinium-based bent aromatic amphiphiles: nonionic surface modification of nanocarbons in water

Beilstein Journal of Organic Chemistry
Efficient water-solubilization of nanocarbons is desirable for both their biological and material applications, but so far has mainly relied on covalent modifications or amphiphiles featuring ionic side-chains. Here, we report a facile 2–4-step synthesis
Lorenzo Catti, Shinji Aoyama, Michito Yoshizawa   +2 more
doaj   +1 more source