A new facile method for the preparation of trans-2-aryl-3, 3-dimethylcyclopropane-1- carboxylic acids was developed. The new method involved [2+ 2]-cycloaddition of styrenes with N, N, 2-trimethylpropionamide followed by bromination and rearrangement of the resulting 3-aryl-2, 2-dimethylcyclobutanones, affording the title compounds in two steps in 60–84% overall yields.
