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Isobutylene (80.0 mL, 0.847 mol) was passed through a mixture of 1-(4-bromophenyl)cyclopropanecarboxylic acid (10.0 g, 0.0415 mol, example 238, step 1) and sulfuric acid (1.0 mL, 0.019 mol) at −78° C. The mixture was sealed and was stirred at room temperature overnight. The isobutylene was evaporated at room temperature and the residue was dissolved in ethyl acetate (100 mL), and washed with water and brine successively. The organic layer was dried over Na2SO4, filtered, and concentrated under reduced pressure to give the desired product.

1. customThe mixture was sealed
2. customThe isobutylene was evaporated at room temperature
3. dissolutionthe residue was dissolved in ethyl acetate (100 mL)
4. washwashed with water and brine successively
5. dry with materialThe organic layer was dried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure