Conformational Studies of Annulated 2,2′-Bipyridinium Salts

Carmen Campa, Jaime Camps, José Font, Pedro De March

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25 Citations (Scopus)


The synthesis of several 4,4′-disubstituted 2,2′-bipyridinium bridged diquaternary salts, by reaction of the corresponding 2,2′-bipyridines with several dibromide substrates, is reported. Further sulfonation of two of these salts gives rise to bridged 2,2′-bipyridines with zwitterionic character, 4a,b. The twist angle between the two pyridine rings can be estimated from spectroscopic data of these salts. In a propane-bridged salt, 9b, a barrier to conformational mobility of 16.5 kcal mol-1has been obtained by a variable-temperature NMR experiment. © 1987, American Chemical Society. All rights reserved.
Original languageEnglish
Pages (from-to)521-525
JournalJ. Organomet. Chem.
Issue number4
Publication statusPublished - 1 Feb 1987


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