91339-72-9Relevant academic research and scientific papers
Aromatic Nucleophilic Substitution Reactions of Some 2-L-3-Nitro-5-X-thiophenes with Piperidine and Aniline in Methanol. Substituent Constants for the Thiophene System
Consiglio, Giovanni,Frenna, Vincenzo,Arnone, Caterina,Mezzina, Elisabetta,Spinelli, Domenico
, p. 2187 - 2190 (2007/10/02)
The rate constants for the reactions of some 2-L-3-nitro-5-X-thiophenes 1-4 with aniline and of compounds (4) with piperidine in methanol have been measured at various temperatures.By using the data obtained in this work as well as previously available data sets, a series of optimized 'thiophene' ?τ values has been calculated.The susceptibility constants ρ(L) of the various sets have been analysed in the framework of the reactivity-selectivity principle.
Formation of Hydrogen-bonded Complexes between Phenol and Some Heterocyclic Bases in Carbon Tetrachloride
Orban, Miklos,Kiss, Agnes,Barcza, Lajos
, p. 1815 - 1818 (2007/10/02)
The mixtures of phenol and some heterocyclic bases of biological importance have been studied by i.r. spectroscopy in CCl4 and equilibrium constats (K) and thermodynamic data (ΔH, ΔG, DΣ) have been determined at 25 and 40 deg C.The formation constants of hydrogen-bridged phenol complexes were found to be related to the protonation constants of the bases, but no strict linearity can be proved in many cases.The participation of the non-bonded electron pair of the heteroatom in the ?-system of the rings play a dominating role in the proton-acceptor processes.
