Abstract A correlation was found between oxidation potentials of acylcyclopropanes in solution (in CH 2 Cl 2 and CH 3 CN) and their HOMO energies calculated by semiempirical (AM1) and nonempirical (HF/6-31G and HF/6-31G**) methods. The correlation provides a possibility to forecast the reaction direction of the mentioned substrates and N 2 O 4. The correlation possesses a general character. It was established for instance that arylcyclo- ...