Coordination chemistry of mononuclear iron carbonyl complexes

Catalytic Transfer Hydrogenation of Ketones with KHCr(CO)5/HCO2H/Et3N Systems

“…Aliquots (0.5 mL) were hydrolysed with dilute HCl (0.5 and dinuclear carbonylhydridochromates is in contrast to mL), extracted with diethyl ether (0.5 mL) and analysed by GC. what has been reported in the iron series where NaHFe 2 (CO) 8 is at least 26 times more reactive than mononuclear NaHFe(CO) 4 for the reduction of α,β-unsaturated ketones.…”

“…[2] As an extension of our work on carbonylhydridoferrates, [3,4] we reWe have previously reported that K ϩ [HFe(CO) 4 ] Ϫ does cently became interested in the chromium series, and we not reduce normal ketones in the absence of a Brønstedt developed a very easy and reproducible preparation of acid, either in THF or in methanol. [12] In contrast, we have K ϩ [HCr(CO) 5 ] Ϫ .…”

“…[10] In these catalytic reactions, [HCr(CO) 5 ] Ϫ is believed to be the active species. served for [HFe(CO) 4 ] Ϫ , [4] the reactivity of [HCr(CO) 5 ] Ϫ seems to be strongly dependent on the associated cation, To the best of our knowledge, no report has been published of the use of carbonylchromium complexes as cata-due to ion-pairing effects. [14] For example, it has been reported that [ Ϫ species.…”

“…After stirring for 24 h at room temp., the solution was treated with 1  HCl (10 mL) and diethyl ether (10 mL) was added. cate that, in the presence of excess Fe(CO) 5 , NaHFe(CO) 4 reduces mesityl oxide to 4-methyl-2-pentanone in 96% yield Catalytic Reduction of Ketones: The general procedure is exemplified in the case of cyclohexanone. Triethylamine (300 µL, 2.…”

Zwitterionic Organometallates

“…The intramolecular ion-pairing is thus expected to be very tight. Zwitterionic analogues of ammonium salts of phosphite and phosphinite hydridocarbonylferrates [55] have been studied in order to examine the possibility of a putative ''chiral zwitterionic control strategy'' in asymmetric reduction of prochiral ketones by chiral iron hydrides. [56] Chiral ammonium phosphinite ligands based on ephedrine or valinol skeletons (''ephosium'', ''valphosium'', etc.)…”