Oxidative Intramolecular [4+2]Cycloaddition of o-[(ω-Phenylthioethynyl)acyl]phenols Followed by the Aromatic Pummerer-type Reaction: A Novel Preparation of the peri-Hydroxy Dihydroquinone Structure - Akai, Shuji; Iio, Kiyosei; Takeda, Yoshifumi; Ueno, Hiroshi; Kita, Yasujuki (Synlett, 1997)