4,7-dimethyl-1H-indene → HCID 178506817, compound
Reaction equation
[CH3:1][C:2]1[CH:10]=[CH:9][C:8]([CH3:11])=[C:7]2[C:3]=1[CH:4]=[CH:5][CH2:6]2.C([Li:16])CCC>O1CCCC1>[CH3:1][C:2]1[CH:10]=[CH:9][C:8]([CH3:11])=[C:7]2[C:3]=1[CH:4]=[CH:5][CH:6]2[Li:16]Participants
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Conditions
- Temperature
- 0 °C
Procedure
38.2 g (265 mmol) of 4,7-dimethylindene were dissolved in 350 ml of tetrahydrofurane and the temperature of the solution was cooled to 0° C. Then, 165 ml of n-butyllithium (1.6M in hexane, 264 mmol) were added, dropwise for 2.5 hours. After having again heated up to room temperature and stirred the whole for 4 hours, a purple-red solution of 4,7-dimethyl-indenyl-lithium was obtained. This solution was cooled to -70° C. and treated, dropwise for 35 minutes, with 25.3 g of 1,2-dibromoethane (135 mmol) in 15 ml of tetrahydrofurane. After having heated up to room temperature, a slight yellow solution was obtained to which water was added. The organic phase was collected ed dried on Na2SO4. The solvent was then evaporated under vacuum and 20 g of product were obtained (yield 48%).
Workup
- temperatureAfter having again heated up to room temperature
Sources & evidence
- ORD record
- ord-0817b1a32f304443a0c78dbe388bee0a
- Source dataset
- uspto-grants-1999_03
- Patent number
- US05886123
Reaction notes
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