Regioselective Formation of 3-Selanyl-3-siloxyoxetanes in the Paternò-Büchi Reaction of Silyl O,Se-Ketene Acetals (O,Se-SKA) - Abe, Manabu; Tachibana, Kei; Fujimoto, Kiyotada; Nojima, Masatomo (Synthesis, 2001)