Synthesis of cationic arene complexes of iron and ruthenium with 1,2-bis(diisopropylphosphino)ethane (dippe): X-ray crystal structures of 6-C6H6)(dippe)> and 6-C6H6)(dippe)>

Article abstract of DOI:10.1016/S0022-328X(96)06491-1

The complex (dippe = 1,2-bis(diisopropylamino)ethane reacts with cyclohexadienyl-lithium in tetrahydrofuran yielding a dark mixture, from which the hydrido-arene complex (1) can be isolated in moderate yields upon treatment with MeOH-NaBPh4. 1, as well as the toluene complex (2), can be prepared by reaction of with n-BuLi in benzene or toluene respectively, followed by MeOH-NaBPH4.The ruthenium complexes + (L = C6H6, p-isopropylmethylbenzene (p-cymene)) are obtained by reaction of <2> with dippe and Ag⁺, and isolated as the tetraphenylborate salts 3.These compounds react with NaBH4 in acetone-ethanol furnishing the hydrido-arene derivatives (L = C6H6 5, p-cymene 6).All the compounds were characterized by IR, NMR and microanalysis.The X-ray crystal structures of 3 and 4 are also reported.