Exposure of [N2H62+S042-] at 77 K to 6OCo y-rays gave SO4.radicals and a novel species with two equivalent nitrogen nuclei and six equivalent protons, thought t o be N2H6'+ formed by electron capture; these species readily gave NH3.+ radicals on annealing.

Exposure of a range of dialkyl carbonates as dilute solutions in trichlorofluoromethane at 77 K gave rearranged cations in which hydrogen is transferred from carbon to the carbonyl oxygen. Similar species were obtained from the cyclic derivatives, ethylene and propylene carbonates. No evidence has been found for complex formation with solvent molecules such as occurs for methyl formate cations. For the dimethyl derivative the rearrangement appeared to occur even at ca. 4 K. For trimethyl borate a similar reaction occurred, giving either H,cOB(OMe)(O( )+or H,COB(OMe) + MeOH.