Experimental and theoretical study of the gas-phase interaction between ionized nitrile sulfides and pyridine.
The gas-phase reactivity of ionized nitrile sulfides, R-C[triple bond]N(+)-S*, towards neutral pyridine was studied both experimentally (six sector hybrid mass spectrometer) and theoretically (density functional theory and Møller-Plesset ab initio calculations). An ionized sulfur atom transfer and a cycloaddition process respectively yielding ionized pyridine N-thioxide and a thiazolopyridinium cation were observed. Whereas the very efficient S*+ transfer reaction probably involves the intermediacy of several ion-molecule complexes, the thiazolopyridinium ion formation is likely to be initiated by an electrophilic attack of the R-C[triple bond]N(+)-S* ion on the nitrogen atom of pyridine; the resulting intermediate then undergo an intramolecular substitution of an alpha-hydrogen atom by the sulfur atom.
Gerbaux
Pascal
P
Organic Chemistry Laboratory, University of Mons-Hainaut, Mons, Belgium. pascal.gerbaux@umh.ac.be
Haverbeke
Yves Van
YV
Flammang
Robert
R