in dichloromethane-d2 (N2); electrophilic cleavage reaction by addn. of HgBr2 to a soln. of Cp*Os(CO)(PMe2Ph)CH2Ph in CD2Cl2;; not isolated, detected by NMR;;

catalyst: Et4NBr in N,N-dimethyl-formamide mixt. of benzyl bromide and Hg in satd. soln. of Et4NBr in dry DMF agitated (sealed ampoule, Ar, in the dark, 100 h);; ppt. filtered off, washed with ether, dried, (chromy. of the mother liquor: silica gel, CHCl3-hexane (2:1), protected from light);;

in dichloromethane-d2 (N2); electrophilic cleavage reaction by addn. of HgBr2 to a soln. of Cp*Os(CO)2CH2Ph in CD2Cl2;; not isolated, detected by NMR;;

in dichloromethane-d2 under nitrogen, slight molar excess of the mercury compound; not septd., detectedby IR- and NMR-spectra;;

in dichloromethane-d2 under nitrogen, slight molar excess of mercury compound; not septd., detected by IR- and NMR-spectra;;