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- W2950572044 abstract "The kinetics of the title reactions have been studied as a function of amine and methoxide ion concentrations in buffered solutions. All the reactions studied are general base-catalysed. An examination of the catalytic coefficients obtained for each amine-substrate system has showed that the catalysis observed occurs through a SB-GA mechanism and that the general base-catalysed product forming step is controlled by the ring size of the cyclic amine. The Hammett ρ 1 values calculated are consistent with previous evidence concerning the interactions between the substituent at the C-5 para-like carbon atom and the leaving group. Moreover, the results confirm that a methyl group in such a position can behave as a weakly electron-attracting substituent" @default.
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- W2950572044 date "1994-01-01" @default.
- W2950572044 modified "2023-10-16" @default.
- W2950572044 title "Substituent Effects in the Reactions of Some 2-Methoxy-3-nitro-5-X-thiophenes with Pyrrolidine and Piperidine in Methanol" @default.
- W2950572044 doi "https://doi.org/10.3987/com-93-s79" @default.
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