Chemistry of transition metals. III. Reactions of some alkyl dichlorides with titanium

Abstract

1,2- and 1,3-Dichloropropane react with clean titanium at ambient temperature to yield propylene, and a mixture of propylene (10%) and cyclopropane (90%), respectively. The surface is poisoned by adsorbed halide against further reaction at ambient temperature, but for temperatures > 150°C, a continuing dehalogenation reaction occurs with formation of titanium halide and the same unsaturated hydrocarbons as those formed at a clean surface. The high-temperature reactions obey a half-order rate law in reactant and have activation energies of 24 and 28 kcal/mole for the 1,2- and 1,3-dihalides, respectively.