... Photoconversions of methyloxiranes radical cations in in freonic matrices at 77 K . Abstract It has been shown that upon x-ray irradiation of various methyloxiranes in freonic matrices at 77 K radical cations may be stabilized both in the open form and in the cyclic form with an elongated C–C bond. ... Radical cations of tetramethyloxirane that are stabilized in the open form are resistant to the action of light. ... Moscow University Chemistry Bulletin . 2012, Vol. ...