March 1981 The Photochemical Reactions of 5H-Benzo[a]phenoxazin-5-one with Alkylthiols and Thiophenol Yoshio Ueno *, Yutaka Takeuchi, Jinya Koshitani and Takatoshi Yoshida Department of Industrial Chemistry, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya-shi 466, Japan Received August 8, 1980 ... 6-Alkylthio- and 6-phenylthio-5H-benzo[a]phenoxazin -5-ones have been synthesized by the photochemical reaction of 5H-benzo[a]phenoxazin- ...