Substituent effects in the reaction of phenols with polyacrylonitrile radicals |
| |
Authors: | LN Patnaik SN Patnaik SP Rout MK Rout |
| |
Institution: | Mayurbhanj Chemical Laboratory, Department of Chemistry, Ravenshaw College, Cuttack 753003, India |
| |
Abstract: | Substituent effects in the reactivities of phenols towards polyacrylonitrile radicals have been studied in terms of Swain and Luptons' field (Fk) and resonance (Rk) components of the substituent parameters and the unique positional weighting factors (fj and rj) proposed by Williams and Norrington, with the aid of the following equation: Pi′s are the rate parameters, Pi0 being that for a standard reference compound. Two types of rate parameters have been employed—one, suggested by Simonyi, Tüdös and Pospisil (β) and another, suggested by us, (K), which is obtained from a plot of Monomer]/(rate of polymerisation) vs Phenol]. The correlations have been found to be quite satisfactory with both β and K. An attempt has been made to ascertain the nature of the transition state from the reaction parameters αi and βi; a dipolar transition state is suggested. The anomalous kinetic behaviour of hydroxy phenols has been discussed. |
| |
Keywords: | To whom all correspondence should be directed |
本文献已被 ScienceDirect 等数据库收录! |
|