8 2 hz h 3 and h 5 7 52 1h br d j 8 0 hz h 3 u2032 7 40 7 36 3h m vinyl h h 1 u2032 and h 4 u2032 7 21 1h d j 16 4 hz vinyl h 6 03 1h br d j 12 5 hz u2014 c h u2550 ch ch 3 2 oh 5 89 1h br s h 7 u2032 5 87 1h d j 12 5 hz u2014 ch u2550 c h ch 3 2 oh 2 25 2h br s h 6 u2032 1 25 12h s 4 u00d7 u2014 ch 3 to a suspension of potassium hydride 35 in oil 4 6 g 40 mmol in ethyl ether 50 ml was added dropwise a solution of 1 2 3 4 tetrahydro 4 4 dimethyl 1 oxo 7 bromo naphthalene u s pat no 5 618 839 and ep 661 259 a1 5 06 g 20 mmol in ether 10 ml the mixture was stirred at room temperature for 2 hours then cooled down to u2212 30 u00b0 c methyl triflate 3 4 ml 30 mmol was added and the mixture was stirred at u2212 30 u00b0.