oxalyl dichloride; dimethyl sulfoxide; triethylamine in dichloromethane oxalyl chloride soln. was cooled to -78 °C; addn. of DMSO; stirring; addn. of (hydroxymethyl)-o-carborane; stirring for 15 min; addn. of Et3N and was allowed to warm to room temp.; addn. of water; extn. three times with CH2Cl2;; the combined org. phase was washed with H2O, dried over MgSO4; the filtered soln. was concd; extn. with pentane; sublimation of the solid followed by chromy. on silica gel by eluting with ether/hexane gave the products;;