2,3-dihydrocyclopenta[a]naphthalen-1-one

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: α,α,α′,α′-Tetrabromo-o-xylene (200 g, 0.48 mole) was dissolved in 2000 mL of dimethylformamide. 2-Cyclopentene-1-one (40 g, 0.25 mole) was added, along with 500 g sodium iodide. The mixture was heated overnight at 80° C. The mixture was cooled and poured into 2 L of ice water containing sodium bisulfide (20 g). The solids were collected and recrystallized from ethanol to give 65 g of benz[f]indan-1-one. The benzindanone was then reduced by dissolving in 600 mL of ethanol and adding 30 g of sodium borohydride, over a 2-hour period. The solution was stirred at room temperature overnight and quenched with 1 N HCl. The ethanol was removed under vacuum, and the product extracted into toluene. The product was then recrystallized from hexanes to give 58 g of benz[f]indan-1-ol. The benzindanol was then dehydrated by refluxing in 100 mL of 10% sulfuric acid overnight. The solution was cooled and extracted with toluene. The product was purified by column chromatography, in hexanes, followed by two recrystallizations from ethanol, and a final recrystallization from hexane to give 10.8 g (13% overall yield) of Benz[f]indene. over a 2-hour period quenched with 1 N HCl The ethanol was removed under vacuum the product extracted into toluene The product was then recrystallized from hexanes

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 12.36 g portion of benzindanone (63 mmole) was dissolved in 300 ml of THF and 150 ml of methanol, and 3.6 g (95 mmole) of sodium borohydride was added at room temperature. After stirring the mixture for 6 hours, the reaction was terminated with dilute hydrochloric acid, and extracted with hexane (100 ml X 2) and ether (100 ml×2). Two stereoisomers of benzindanol were obtained. The crude product was used for the next reaction without purification. the reaction was terminated with dilute hydrochloric acid extracted with hexane (100 ml X 2) and ether (100 ml×2)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: α,α,α′,α′-Tetrabromo-o-xylene (200 g, 0.48 mole) was dissolved in 2000 mL of dimethylformamide. 2-Cyclopentene-1-one (40 g, 0.25 mole) was added, along with 500 g sodium iodide. The mixture was heated overnight at 80° C. The mixture was cooled and poured into 2 L of ice water containing sodium bisulfide (20 g). The solids were collected and recrystallized from ethanol to give 65 g of benz[f]indan-1-one. The benzindanone was then reduced by dissolving in 600 mL of ethanol and adding 30 g of sodium borohydride, over a 2-hour period. The solution was stirred at room temperature overnight and quenched with 1 N HCl. The ethanol was removed under vacuum, and the product extracted into toluene. The product was then recrystallized from hexanes to give 58 g of benz[f]indan-1-ol. The benzindanol was then dehydrated by refluxing in 100 mL of 10% sulfuric acid overnight. The solution was cooled and extracted with toluene. The product was purified by column chromatography, in hexanes, followed by two recrystallizations from ethanol, and a final recrystallization from hexane to give 10.8 g (13% overall yield) of Benz[f]indene. over a 2-hour period quenched with 1 N HCl The ethanol was removed under vacuum the product extracted into toluene The product was then recrystallized from hexanes