2815.     RICE, F. O.  Attempts to Prepare the Methylene Radical by the Thermal Decomposition of Hydrocarbons.  Jour. Am. Chem. Soc., vol. 61, 1939, p. 213; Chem. Abs., vol. 33, 1939, p. 1663.

        Results indicate that trivalent C radicals are the primary products of organic dissociations, and even in the few cases, such as CH₂N₂ and CH₂:CO, in which CH₂ is the primary product, it passes readily into the trivalent state.