“ <i>Syn-Effect</i> ” in the Conversion of ( <i>E</i> )-α,β-Unsaturated Esters into the Corresponding β,γ-Unsaturated Esters and Aldehydes into Silyl Enol EthersGuha, Samar Kumar; Shibayama, Atsushi; Abe, Daisuke; Sakaguchi, Maki; Ukaji, Yutaka; Inomata, Katsuhiko · Bulletin of the Chemical Society of Japan · 2004