title: Structural characterization of acetylpyridinium-ethyl pyruvate adducts by electrospray ionization mass spectrometry.
abstract: The reactions of ethyl pyruvate with acetic anhydride and pyridine were studied by electrospray ionization mass spectrometry (ESI-MS). Ethyl 2-acetoxy-2-pyridiniumpropionate (1) (m/z 238) resulting from the reaction of the acetylpyridinium cation with ethyl pyruvate, and the adduct of ethyl 2-acetoxyacrylate with a pyridinium cation (2), bound together by non-covalent interactions (m/z 238), were identified by ESI-MS for the first time. Structures 1 and 2 cannot be distinguished, probably because one may be converted into the other and vice versa.
authors.affiliation: Organic Catalysis Research Group, Hungarian Academy of Sciences, Dóm tér 8, H-6720 Szeged, Hungary. bartok@chem.u-szeged.hu
authors.forename: Mihály
authors.initials: M
authors.lastname: Bartók
authors.forename: Tibor
authors.initials: T
authors.lastname: Bartók
authors.forename: György
authors.initials: G
authors.lastname: Szöllosi
authors.forename: Károly
authors.initials: K
authors.lastname: Felföldi
mesh_terms: D002930:Cinchona Alkaloids / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D011726:Pyridinium Compounds / Q000737:chemistry*; D011773:Pyruvates / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D002930:Cinchona Alkaloids; D007202:Indicators and Reagents; D011726:Pyridinium Compounds; D011773:Pyruvates; C046522:ethyl pyruvate