monofluorobenzene and the mixture was stirred at 35 u00b0 40 u00b0 c for 2 hours then 300 g of ice was added thereto to discontinue the reaction the organic layer of the reaction mixture was washed successively with 6n hyrdochloric acid 200 ml water 500 ml and a saturated aqueous sodium chloride solution 200 ml and then 138 g of cf 2 clcfclo cf 2 3 co p c 6 h 4 f was obtained as a fraction having a boiling point of 98 u00b0 98 u00b0 c 2 mmhg by distillation yield 74 7 str14 5 135 g 0 308 moles of cf 2 clcfclo cf 2 3 co p c 6 h 4 f and 2 ml of water were poured into an autoclave having a capacity of 250 ml brought into a vacuum state and then 110 g of sf 4 was poured into the autoclave the autoclave was shaked at 155 u00b0 160 u00b0 c for 30 hours then the gas was purged from the autoclave and the reaction mixture was neutralized to ph 7 0 with an aqueous sodium hydrogen carbonate solution then the reaction mixture was washed with water and dried over cacl 2 and 125 g of cf 2 clcfclo cf 2 3 cf 2 p c 6 h 4 f was obtained as a fraction having a boiling point of 90 u00b0 c 2 mmhg by distillation yield 87 7 6 23 g 1 3 moles of powdery zinc 100 ml of anhydrous dimethyl formamide and 0 5 g of iodine were charged into a four necked flask having a capacity of 300 ml provided with a stirrer a thermometer a reflux condenser and a dropping funnel and the flask was heated to 110 u00b0 c then a solution containing.