... The precision of detemfining chemical shifts was 0.01 ppm, and couplmg conslanls 0.5 Hz ... Three compounds were separated: 3-allylbenzimidazoline-2-thione (2a) (1 g. 25q ), 1,3- diallylbenzimidazoline-2-thione ... L. 1. Belen'kii (editor), Chemistry of" Organic Cotnl~Ottnds qf,g' ...
[Furuta, Kyoji; Ikeda, Yoshihiko; Meguriya, Noriyuki; Ikeda, Nobuo; Yamamoto, Hisashi Bulletin of the Chemical Society of Japan, 1984 , vol. 57, # 10 p. 2781 - 2790]