Ethylene and trimethylene phenylphosphonites were prepared from phenylphosphonous dichloride and corresponding glycols. Ethylene n-propylphosphonite was obtained by reacting ethylene phosphorochloridite with n-propylrnagnesium bromide. The phosphonites, being reacted with such acids as hydrogen chloride and carboxylic acids, have given ring- opening addition compounds, which suggests the possibility that these phosphonites may ...