The reactivity of the [Re≡O]3+ core toward aromatic 1,2-diamines: the formation of rhenium(V)-imido complexes

Abstract The reaction of the aromatic diamines 1,2-diaminobenzene, 2,3-diaminophenol (H 2 L), 2,3-diaminotoluene and 3,4-diaminobenzophenone (H 2 NRNH 2 ) with trans -ReOCl 3 (PPh 3 ) 2 in an equimolar ration in ethanol gave the products trans -[Re(NRNH 2 )Cl 3 (PPh 3 ) 2 ] in good yield. IR 3 H NMR and X-ray crystallographic results indicate that the diamine ligands coordinate to rhenium(V) in a dianionic monodentate imido form. The structure of trans -[Re(L)Cl 3 (PPh 3 ) 2 ] was determined and shows that only the deprotonated amino nitrogen in the 2-position of the potentially ambidenatate 2,3-diaminophenol molecule is coordinated to the metal.