Kinetic and equilibrium studies of ?-adduct formation and substitution in the reactions of sulphite ions with some alkyl and aryl ethers and thioethers
作者:Michael R. Crampton、Anthony J. Holmes
DOI:10.1002/(sici)1099-1395(1998110)11:11<787::aid-poc38>3.0.co;2-0
日期:1998.11
Kinetic and equilibrium results are reported for the reactions of sulphite with the ethyl and phenyl ethers of 2,4,6-trinitrophenol and 2,4,6-trinitrotbiophenol in 80/20 (v/v) water/DMSO. In each case 1:1 and 1:2 adducts are observed by reaction of sulphite at one or two unsubstituted ring positions respectively. In the case of the ethyl derivatives these adducts are long-lived; however, the phenyl derivatives rapidly yield 2,4,6-trinitrobenzene-sulphonate, the substitution product. This difference is attributed to a change in the nature of the rate-determining step, from nucleophilic attack with the phenyl derivatives to leaving group departure with the alkyl derivatives. (C) 1998 John Wiley & Sons, Ltd.