摘要:
Reactions of rhenium pentachloride with ethyl isocyanate in dichloroethane and acetonitrile are the first to demonstrate the feasibility of inserting organic isocyanates and nitriles into a rhenium-halogen bond. IR spectroscopy and elemental analysis data show that the addition of one to three ethyl isocyanate molecules in dichloroethane yields ReCl4[N(Et)C(O) (n) ]Cl with n = 1-3, depending on the relationship between the reactants. The reaction in acetonitrile yields a heteromolecular insertion product containing a chain of two isocyanate groups and one nitrile group attached to the same rhenium-chlorine bond: ReCl4[{N(Et)C(O)}(2)N=C(Me)Cl]. When EtNCS is used instead of EtNCO, the reaction is reversible.