Spectroscopic and theoretical studies of some 'alpha'-ethylsulfinyl ortho-substituted acetophenones - Olivato, Paulo Roberto; Yreijo, Marcelo Hideaki; Andrade, Emilene M.; Rodrigues, Alessandro; Zukerman-Schpector, Júlio; Distefano, Giuseppe; Dal Colle, Maurizio (Journal of Molecular Structure (THEOCHEM), 2002)