3-Bromobenzaldehyde → 1-Bromo-3-(2-methyl-1-propenyl)benzene

To a stirred slurry of 17.83 g (41.2 mmol) of isopropyltriphenylphosphonium iodide and 300 mg (1.1 mmol) of 18-crown-6 in 50 mL of THF under nitrogen at 5° C. was added 4.60 g (41.0 mmol) of potassium t-butoxide over 5 minutes. The resulting deep red-orange slurry was stirred 10 minutes and then a solution of 4.31 mL (37.0 mmol) of 3-bromobenzaldehyde in 40 mL of THF was added at a rate to keep the temperature below 10° C. The resulting bright yellow slurry was stirred for 20 minutes and then poured into 300 mL of hexanes. The solids were filtered off and the filtrate evaporated. This residue was purified by flash chromatography (5×15 cm column) and eluted with hexanes to provide 5.88 g (75%) of title compound as a colorless oil.

1. customthe temperature below 10° C
2. stirringThe resulting bright yellow slurry was stirred for 20 minutes
3. filtrationThe solids were filtered off
4. customthe filtrate evaporated
5. customThis residue was purified by flash chromatography (5×15 cm column)
6. washeluted with hexanes

ORD record

ord-2e4bd4a7bf1b4401a81feba32fb102f2

Source dataset

uspto-grants-1992_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05157027