identifiable product / chemical sciences / methylene chloride solution / chemical oxidation / adiabatic ionization energy / chemical means / pentane/methylene chloride solution / cationic aromatic systems / chemical behavior / gas chromatography / cyclopropyl / chemical shift / gas phase / Energy single points / pharmaceuticals containing cyclopropyl groups / electron diffraction gas-phase structure analyses / preferred ring-opening trapping product / lower chemical purity / /