Microwave-assisted synthesis of cyclopentadienone iron tricarbonyl complexes: molecular structures of [{η4-C4R2C(O)C4H8}Fe(CO)3] (R = Ph, 2,4-F2C6H3, 4-MeOC6H4) and attempts to prepare Fe(II) hydroxycyclopentadienyl–hydride complexes

Abstract

Microwave irradiation of 1,6-diynes, RC≡C(CH 2 ) 4 C≡CR, with Fe(CO) 5 in dimethylether leads to the facile and clean formation of cyclopentadienone complexes [{η

Tetraaminocyclopentadienone Iron Complexes as Hydrogenation Catalysts

“…2.09 to 2.20 Å, whereas the distance to the carbonyl carbon atom C1 is markedly longer (∼2.44 Å). Similar structural features have been reported for other CPD iron tricarbonyl complexes, ,,,− and good agreement is also found with the structures of the amino-substituted systems III and IV (Figure ). , As also observed in the latter ( IV ), the nitrogen atoms in 4a – 4f retain their pyramidal geometry and show no significant π-interaction with the CPD ring.…”

Iron(0) tricarbonyl η4-1-azadiene complexes and their catalytic performance in the hydroboration of ketones, aldehydes and aldiminesviaa non-iron hydride pathway

“…Surprisingly, as presented in Fig. S96, † the upfield region (0 to −40 ppm) shows no signs of iron hydride formation [51][52][53] which prompted us to think about an alternative mechanism of the hydroboration catalysed by the iron(0) carbonyl complex. It was started with an examination of the interactions between the catalyst (1e) and the substrate (benzaldehyde, PhCHO) and the borane agent (HBpin), respectively, using 1 H NMR spectroscopy, Fig.…”

(Cyclopentadienone)iron Complexes: Synthesis, Mechanism and Applications in Organic Synthesis

“… [111] In presence of these pre‐catalysts, various primary alcohols underwent amination reaction along with few secondary alcohols, affording substituted amines in good to excellent yields (Scheme 24C). Recently, similar type of complexes have been synthesized and characterized by Hogarth and co‐workers through microwave irradiation of 1,6‐diynes with Fe(CO) 5 [112] . Protonation of these complexes using H 3 PO 4 or HBF 4 led to the formation of corresponding hydroxycyclopentadienyl complexes.…”