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- W1968122986 abstract "The reaction between 1,ω-bis(2-bromopyridinium)alkanes (with 3, 4, 5, 6 and 8 methylene groups) with azide ions was examined to investigate the effects of charge proximity between the aromatic rings upon reactivity. 1H and 13C NMR spectra show the formation of a half-reacted intermediate having bromopyridinium and azidepyridinium extremities. Activation parameters for the reaction, ionic strength and solvent effects were investigated. An increase in reactivity was found with decrease in the methylenic chain length for both reactant and intermediate. The results are rationalized by the favorable formation of sandwich-type complexes between the pyridinium rings and the azide for the compounds with shorter methylenic spacers. Copyright © 1999 John Wiley & Sons, Ltd." @default.
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- W1968122986 date "1999-11-01" @default.
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- W1968122986 title "Reactions of 1,-bis(2-bromopyridinium)alkanes with azide ions: charge effect and intermediates" @default.
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- W1968122986 doi "https://doi.org/10.1002/(sici)1099-1395(199911)12:11<837::aid-poc154>3.0.co;2-t" @default.
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