Synthesis and Reactivity of Mono‐, Di‐, and, Triiron Selenocarboxylate Complexes

Abstract

AbstractTreatment of the iron selenide (μ‐Se)[CpFe(CO)2]2 with one equivalent of 1, 3, 5‐C6H3(COCl)3 gave the organoiron selenocarboxylate complex CpFe(CO)2SeCO‐3, 5‐C6H3(COCl)2 (1), which contains two free acid chloride groups. Complex 1 reacted with amines, thiols, and phenols to produce the corresponding amides CpFe(CO)2SeCO‐3, 5‐C6H3(CONR2)2 (2), thioesters CpFe(CO)2SeCO‐3, 5‐C6H3(COSR)2(3), and aromatic esters CpFe(CO)2SeCO‐3, 5‐C6H3(CO2Ar)2 (4), respectively. Complex 1 was converted into the diacid CpFe(CO)2SeCO‐3, 5‐C6H3(COOH)2 (5) or the diamide CpFe(CO)2SeCO‐3, 5‐C6H3(CONH2)2 (6) complexes by reactions with NaOH or NaNH2, respectively. The bis(seleno)‐1, 3‐(CpFe(CO)2SeCO)2‐5‐C6H3(COCl) (7) and tris(seleno)‐carboxylate 1, 3, 5‐(CpFe(CO)2SeCO)3C6H3 (8) complexes were also prepared by controlled reaction of 1, 3, 5‐C6H3(COCl)3 with the iron selenide (μ‐Se)[CpFe(CO)2]2. Complexes 1–8 were characterized by spectroscopic techniques (IR, 1H‐NMR) and by elemental analysis as well. The X‐ray structures of CpFe(CO)2SeCO‐3, 5‐C6H3(COCl)2 (1) and CpFe(CO)2SeCO‐3, 5‐C6H3(COSCH2Ph)2 (3b) were determined.