... R1 R2 S02C12, or N(Et)j, hexane ClCH20^i-: R1 3 ac 7 a b с d R1 Me Ph Me Ph 4 ac R2 f-Bu i-Bu thexyl Me Scheme 1. 706 Acta Chemica Scandinavica 43 (1989) 706 ... Iso- butane or ammonia was used for chemical ionization (CI); the spectra are presented as mlz (% rei. ... Chem. ...