64326-91-6Relevant articles and documents
Host-guest complexation behavior of resorcinarenes with tetraalkylammonium ions and N-methylpyridinium ions in methanol: The effect of bulky hydrophobic substituents at the extra-annular positions
Morikawa, Osamu,Yamaguchi, Hiroshi,Katsube, Yoshiko,Abe, Kazuyuki,Kobayashi, Kazuhiro,Konishi, Hisatoshi
, p. 2877 - 2886 (2006)
The host-guest interaction of C-methylresorcin[4]arene and its derivative having four tert-butylsulfanylmethyl groups at the extra-annular positions was studied by 1H NMR spectroscopy in CD3OD. Based on the association constants (Ka) and the complexation-induced NMR shifts (CIS), it was concluded that the bulky substituents create a deep cavity with a narrow entrance and improve the size and shape selectivity. Copyright Taylor & Francis Group, LLC.
Regioselective Direct C-H Trifluoromethylation of Pyridine
Yang, Xiao,Sun, Rui,Li, Shun,Zheng, Xueli,Yuan, Maolin,Xu, Bin,Jiang, Weidong,Chen, Hua,Fu, Haiyan,Li, Ruixiang
supporting information, p. 7108 - 7112 (2020/10/02)
A highly efficient and regioselective direct C-H trifluoromethylation of pyridine based on an N-methylpyridine quaternary ammonium activation strategy has been developed. A variety of trifluoromethylpyridines can be obtained in good yield and excellent re
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.