7538-79-6Relevant academic research and scientific papers
Base-Free Generation of Organic Electron Donors from Air-Stable Precursors
Tintori, Guillaume,Nabokoff, Pierre,Buhaibeh, Ruqaya,Bergé-Lefranc, David,Redon, Sébastien,Broggi, Julie,Vanelle, Patrice
, p. 3148 - 3153 (2018/03/13)
Organic electron donors (OEDs) are powerful reducing agents recognized for their potential in the reduction of challenging substrates and in original applications. Nonetheless, their low stability in atmospheric oxygen or over time complicates their manipulation and storage. To overcome these constraints and enhance OED practicality, new air- and moisture-stable aminopyridinium carboxylate and carbonate precursors were synthesized and thermally activated to generate the potent electron donor in situ. Carboxylate adducts proved to be excellent latent OED systems, enabling the facile and efficient reduction of challenging substrates. Their reduction properties were correlated to their structural characteristics by thermogravimetric and spectroscopic analysis.
Efficient macrocyclization achieved via conformational control using intermolecular noncovalent π-cation/arene interactions
Bolduc, Philippe,Jacques, Alexandre,Collins, Shawn K.
supporting information; experimental part, p. 12790 - 12791 (2010/11/04)
Quinolinium salt 3 is an effective additive that acts as a conformation control element (CCE) to promote macrocyclization to form rigid cyclophanes via olefin metathesis or Glaser-Hay coupling, which do not cyclize in the absence of the additive. The additives are easily synthesized and highly modifiable and have solubility profiles which allow for simple recovery via filtration.
Preparation and in vitro evaluation of monoquaternary inhibitors of brain cholinesterases
Jun, Daniel,Paar, Martin,Binder, Jiri,Marek, Jan,Pohanka, Miroslav,Stodulka, Petr,Kuca, Kamil
scheme or table, p. 500 - 503 (2010/04/23)
Acetylcholinesterase inhibitors are currently of high interest due to the many reasons. Among them, Alzheimer's disease drugs are of great interest. In this study, eleven monoquaternary pyridinium salts substituted by different groups (electron donors and
Polycations-12. The synthesis of liquid ionic phosphates (lips) from mono- and polycationic ammonium halides
Lall, Sharon,Behaj, Valbona,Mancheno, Danny,Casiano, Robert,Thomas, Marie,Rikin, Amir,Gaillard, Jennifer,Raju, Ravinder,Scumpia, Alexander,Castro, Steve,Engel, Robert,Cohen, JaimeLee Iolani
, p. 1530 - 1540 (2007/10/03)
Preparations are reported for an extensive series of phosphate salts of polyammonium species from the corresponding halide salts. The phosphate salts, as anhydrous materials, are liquid at or near room temperature. Three approaches for the preparation of these materials are noted, including treatment with aqueous hexafluorophosphoric acid, classical ion exchange methods, and treatment with 85% phosphoric acid. The last of these provides the most desirable results. Several monocationic phosphate salts have also been prepared for comparison with other types of ionic liquids.
Second-order hyperpolarizability of pyridinium cations
Anwar,Duan, Xuan-Ming,Komatsu, Kyoji,Okada, Shuji,Matsuda, Hiro,Oikawa, Hidetoshi,Nakanishi, Hachiro
, p. 247 - 248 (2007/10/03)
The second-order hyperpolarizability (β) of pyridinium cations with cutoff (λco) shorter than 400 nm were studied by semiempirical calculation and the hyper-Rayleigh scattering (HRS) technique. The β value of 4-dimethylaminopyridinium (λco= 390 nm) was evaluated to be about 1.5 times larger than that of p-nitroaniline (λco= 473 nm) in methanolic solution using 1064 nm light as a fundamental beam.
Menschutkin Reactions of Bicyclic Aliphatic Amines and of Pyridine Derivatives with Methyl Iodide. Extended Broensted Treatments and Isokinetic Relationships in Acetonitrile-Methanol
Kondo, Yasuhiko,Uematsu, Ryoichi,Nakamura, Yoshinobu,Kusabayashi, Shigekazu
, p. 1219 - 1224 (2007/10/02)
The rate constants, activation parameters for the Menschutkin reactions for five bases with methyl iodide, and the enthalpies of solution for the relevant species of the reactions have been determined in acetonitrile-methanol.The bases are quinuclidine, 1,4-diazabicyclooctane, and 4-cyano-, 4-t-butyl-, and 4-dimethylamino-pyridine.The coefficients of empirical energy correlations defined in terms of 'more physical' energies, extended Broensted treatments, αphys' and isokinetic temperatures, βphys' have been determined for these reactions.Discussion is provided on the physical meaning of these coefficients in relation to the characteristics of the activated complex.
Empirical Analysis on the Constituent Terms of Transfer Enthalpies. Quarternary Ammonium Ions in Acetonitrile-Methanol Mixtures.
Kondo, Yasuhiko,Uematsu, Ryoichi,Nakamura, Yoshinobu,Kusabayashi, Shigekazu
, p. 111 - 116 (2007/10/02)
Through an empirical analysis of transfer enthalpies in acetonitrile-methanol mixtures using ten quaternary ammonium ions, an equation which expresses the behaviour of the transfer enthalpy as a function of solvent composition has been derived: .On the basis of this equation it is suggested that the transfer enthalpy includes at least three types of interaction, a protophobic interaction, an electrostatic interaction and another interaction, presumably a specific interaction such as dipole-dipole or acid-base association.
