Formation of Mixed-Valent Aryltellurenyl Halides RX_2 TeTeR

摘要

Extremely unstable sulfur difluoride,SF_2,dimerizes to give the slightly more stable mixed-valent dinuclear F_3SSF.To date the only reported organic derivative of F_3SSF is F_3CF_2SSCF_3,which was identified during the disproportiona-tion reaction of F_3CSF,affording F_3CSSCF_3 and F_3CSF_3.While organoselenenyl(II)halides,such as PhSeX(X = Cl,Br),are more stable and often even commercially available,aryltellurenyl(II)halides,RTeX,are also intrinsically unstable and usually observed only as short-lived intermediates in halogenation reactions of diorganoditellurides,RTeTeR,or in synproportionation reactions of RTeTeR with RTeX_3.