room temperature for 7 days to obtain a dark brown solution the resulting reaction was added an equal amount of ice water several times so that the bottle wall was scratched to induce crystallization and then violently stirred to obtain a large amount of dark red precipitate at the bottom of the bottle the precipitate was dissolved in ether and recrystallized by ethanol twice to obtain 3 82 g of a product 20 yield the product of formula 5 had a hydrogen spectrum as follows 1 h nmr 200 mhz in cdcl 3 u03b42 22 s 2h 2 31 s 6h 3 89 s 2h 6 65 s 2h ch u2550 ch 6 80 s 2h following as shown in formula 6 13 5 g of the product in formula 5 200 mmol was dissolved in dry ether slowly added lah in an ice bath slowly stirred under a nitrogen environment and then left at room temperature to react for 24 hours the resulting reaction was added distillated water in an ice bath to neutralize the un reacted lah and then added hydrochloric acid until the organic layer became transparent the mixture was vacuumed by a rotation evaporator to remove ether and then recrystallized by chloroform to obtain 6 58 g of a product 90 yield the product of formula 6 had a hydrogen spectrum as follows 1 h nmr 200 mhz in cdcl 3 u03b4 2 18 2 20.