1006-07-1Relevant academic research and scientific papers
Quaternization reaction of aromatic heterocyclic imines in methanol - A case of strong anti-reactivity selectivity principle with isoselective temperature
Alfaia, Antonio J. I.,Calado, Antonio R. T.,Reis, Joao Carlos R.
, p. 3627 - 3631 (2007/10/03)
Accurate second-order rate constants were measured at 5 °C intervals in the temperature range 20-60 °C for the Menshutkin reaction of 1-methylbenzimidazole, 2-amino-1-methylbenzimidazole and N,N-dimethylaniline with iodomethane and iodoethane in methanol. In every case a good linearity in the Eyring plots was observed. Values for the activation enthalpy and entropy are reported. Analysis in terms of Exner's redefinition of the reactivity-selectivity principle (RSP) identified the present reaction series as a case of strong anti-RSP for selectivity towards the substrate. This case is shown to represent an isoselective relationship with the isoselective temperature lower than the experimental temperatures (β(is) = -52 °C). The isokinetic relationship does not hold in the reaction series with a fixed substrate. These findings suggest an early transition state in the Menshutkin reaction of polyfunctional aromatic imines.
Polarographic Behaviour of Aldoximes in Phenyltrialkylammonium Iodides
Damle, M. V.,Kaushal, R.,Bhale, A.,Tiwari, M.,Malshe, P.T.
, p. 81 - 82 (2007/10/02)
The polarography of a few aromatic aldoximes has been studied in unbuffered 8percent ethanolic medium using phenyltrimethyl- and phenyldimethylammonium iodides as new supporting electrolytes (vs SCE), which are found to be superior to tetralkylammonium ha
