magnesium sulfate instead of 1 mmol of potassium para tosylate and the yield was 3 5 g of copolymer so the polymerization rate was 70 g of copolymer g of palladium hour a carbon monoxide ethylene copolymer was prepared in substantially the same manner as the copolymer of example 3 the differences being that a the catalyst solution contained 100 mmol of tetraglyme instead of 2 mmol of 18 crown 6 and 2 mmol of magnesium sulfate instead of 1 mmol of potassium para tosylate and the yield was 6 g of copolymer so the polymerization rate was 320 g of copolymer g of palladium hour a carbon monoxide ethylene copolymer was prepared in substantially the same manner as the copolymer of example 3 the differences being that a the catalyst solution contained no 18 crown 6 and 2 mmol of antimony sulfate instead of 1 mmol of potassium para tosylate the yield was 17 5 g of copolymer so the polymerization rate was 350 g of copolymer g of palladium hour a carbon monoxide ethylene copolymer was prepared in substantially the same manner as the copolymer of example 3 the differences being that a the catalyst solution contained 2 mmol of antimony sulfate instead of 1 mmol potassium para tosylate and 100 ml of tetraglyme instead of 2 mmol of 18 crown 6 the yield was 18 g of copolymer so.