tetra-n-butylammonium tetrafluoroborate in dichloromethane Kinetics; byproducts: i-Pr3C6H2O2SNC8H4(CH2OH)2(CH2N(BOC)SO2C6H2-i-Pr3)2; under Ar; stoich. amt. of Rh complex and HOCH2C2CH2OH reacted in CH2Cl2 contg. n-Bu4NBF4 in presence of PPh3 (excess) at 25°C; monitored by cyclic voltammetry;