Carbon Dioxide → HCID 53642175, compound

Participants

Reaction Conditions

Reaction Steps

To a stirred, chilled (-70° C.) suspension of 2-[2-(5-bromo-2-thienyl)ethenyl]benzo[b]thiophene (15.6 g) and tetrahydrofuran (400 ml) was added n-butyl lithium (21.4 ml of a 2.5M solution in hexanes), under nitrogen over 10 mins. The solution was stirred at -70° C. for 1.5 hr, and was transferred via canula to a flask containing a suspension of dry ice (excess) and tetrahydrofuran (1000 ml). The suspension was stirred for 2 hrs and allowed to warm to room temperature overnight. The mixture was poured into water (500 ml), acidified with hydrochloric acid, and the tetrahydrofuran was removed in vacuo. The resulting suspension was filtered, and the filter cake was washed with water and dried in vacuo overnight. The filter cake was recrystallized from dimethyl sulfoxide/10% hydrochloric acid to yield 10.5 g (75%) of product, mp 236°-237° C.

Provenance & Evidence