Structural characterization of acetylpyridinium-ethyl pyruvate adducts by electrospray ionization mass spectrometry.
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.
Bartók
Mihály
M
Organic Catalysis Research Group, Hungarian Academy of Sciences, Dóm tér 8, H-6720 Szeged, Hungary. bartok@chem.u-szeged.hu
Bartók
Tibor
T
Szöllosi
György
G
Felföldi
Károly
K
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
D002930:Cinchona Alkaloids; D007202:Indicators and Reagents; D011726:Pyridinium Compounds; D011773:Pyruvates; C046522:ethyl pyruvate