Abstract
Exposure of dilute solutions of dimethylphosphonate in fluorotrichloromethane to 60Co γ-rays at 77 K gave EPR features characteristic of three types of radical cations. One is the parent cation which has formed a weak σ* bond between oxygen and chlorine, with Amax(35Cl)= 78 G. The second is the rearranged distonic cation H2ĊOPH(OMe)(OH)+ and the third is identified as the phosphoryl radical, (MeO)2P(OH)+.In more concentrated solutions (MeO)2PO radicals were also observed, and exposure to visible light converted the chlorine adducts into the carbon-centred radicals.
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