in dichloromethane under Ar; CH2Cl2 added to mixt. of Rh complex and Ph3CBF4, added acetonitrile; concd. in vac., pptd. by addn. of Et2O, filtered, washed with Et2O;

in acetonitrile byproducts: AgCl; addn. of AgBF4 to soln. of Rh-compd., pptn. of AgCl, stirring for 15 min.; filtration of pptd. AgCl, evapn.;

in dichloromethane; acetonitrile byproducts: ferrocene; addn. of ferrocenium tetrafluoroborate (0.20 mmol) to soln. of (Rh2(C2O4)(C8H12)2) (0.20 mmol) in CH2Cl2/CH3CN (1:1);; removal of solvent in vac.; extg. 3 times with ether to remove ferrocene; extg. with CH3CN; concg. ext. and layering with ether; crystn. after 12 h at -20°C; sepn., identification by IR, NMR and elem. anal.;;

in chloroform-d1 byproducts: acetonitrile; gradual addn. of soln. of Rh(COD)(MeCN)2BF4 in CDCl3 to COD; monitoring by NMR;