Water → 136946-81-1

HRID 432886Notes

Reaction equation

[CH2:1]1[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[CH:3]=[CH:2]1.[CH2:10]([Li])[CH2:11][CH2:12][CH3:13].Br[CH2:16][CH2:17]Br.O>O1CCCC1>[CH:1]1([CH2:13][CH2:12][CH:11]2[C:10]3[C:1](=[CH:2][CH:3]=[CH:16][CH:17]=3)[CH:9]=[CH:8]2)[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[CH:3]=[CH:2]1

Participants

Conditions

Temperature: -78 °C

Procedure

50.8 g of indene (437 mmol) were dissolved under an inert atmosphere in 500 ml of tetrahydrofuran in a 2-necked 2 l flask and cooled to −78° C. 175 ml of n-butyllithium (2.5 M in hexane, 437.5 mmol) were added dropwise slowly (1 hour). The mixture was allowed to warm again to room temperature and was stirred for a further 4 hours. It was cooled to −78° C., and 40.42 g of 1,2-dibromoethane (215 mmol) dissolved in 100 ml of tetrahydrofuran were added dropwise (within 20 minutes). After the end of the addition, the temperature was taken to 50° C., stirring was continued for 12 hours, and the mixture was then allowed to cool to room temperature, and 20 ml of water were added. The organic phase was dried and the residue was extracted with pentane. Evaporation in vacuum gave 28.65 g of product (yield=51.6%).

Workup

temperatureto warm again to room temperature
temperatureIt was cooled to −78° C.
additionwere added dropwise (within 20 minutes)
additionAfter the end of the addition
customwas taken to 50° C.
stirringstirring
waitwas continued for 12 hours
temperatureto cool to room temperature
customThe organic phase was dried
extractionthe residue was extracted with pentane
customEvaporation in vacuum

Sources & evidence

ORD record: ord-8a27f97b07954f2bb5d99f9de56acf2d
Source dataset: uspto-grants-2003_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06664351B1

Reaction notes

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