6-Bromo-1-ethylidene-indan → 6-Bromo-1-ethyl-indan

Reaction equation

[Br:1][C:2]1[CH:10]=[C:9]2[C:5]([CH2:6][CH2:7][C:8]2=[CH:11][CH3:12])=[CH:4][CH:3]=1.[H][H]>C(OCC)(=O)C.[Pd]>[Br:1][C:2]1[CH:10]=[C:9]2[C:5]([CH2:6][CH2:7][CH:8]2[CH2:11][CH3:12])=[CH:4][CH:3]=1

Participants

Procedure

6-Bromo-1-ethylidene-indan 41a (3.07 g, 13.7 mmol) was dissolved in 80 mL of ethyl acetate followed by addition of palladium on carbon (0.61 g) at room temperature. The mixture was hydrogenated for 5 hours in a hydrogenator under 3 atm. of hydrogen. The reaction was monitored by TLC until the disappearance of the starting materials. The mixture was filtered to remove palladium on carbon and the filter cake was washed with ethyl acetate (10 mL×3). The filtrate was concentrated under reduced pressure and the residue was purified by silica gel column chromatography to obtain the title compound 6-bromo-1-ethyl-indan 41b (2.75 g, 88.7%) as a light yellow oil.