Tetracarbonylhydridoferrates, MHFe(CO)4: versatile tools in organic synthesis and catalysis

Terminal Iron Carbyne Complexes Derived from Arrested CO2 Reductive Disproportionation

“…Despite the electronic structure features outlined above indicating that Na[ 3 ] should display metal‐centered nucleophilic reactivity, this complex possesses several other Lewis basic sites that may interfere with such reactivity. While we are currently searching for conditions where electrophiles can cleanly add to the Fe center, it is notable that monoanions of the type [HFeL 4 ] − , to which carbamate–carbyne Na[ 3 ] is related, display significantly diminished metal‐based nucleophilicity relative to the corresponding [FeL 4 ] 2− dianions, and therefore may not be a competitive site of electrophilic attack when other Lewis basic groups are present. However, we have found conditions where Na[ 3 ] can be decarboxylated to regenerate the tetraisocyano dianion Na 2 [ 1 ] in a synthetically reversible fashion.…”

Iron(0) and ruthenium(0) complexes with tridentate phosphonite ligands and their potential for ketene formation from methyl iodide, CO and a base

“…The type of complexes Fe-(CO) 2 (PR 3 ) 3 and Fe(CO) 2 (P(OR) 3 ) 3 were obtained in fair to high yields (depending on the ligandÕs cone angle). However, preparations of 7 or 8 starting from K[FeH(CO) 4 ] [56][57][58] or H 2 Fe(CO) 4 [59,60] failed. The Fe(0) dicarbonyl complexes 7 and 8 were finally obtained in low yields ($30%) from the short time irradiation of Fe(CO) 5 with the tridentate phosphine III and IV, respectively (Scheme 7).…”

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

“…[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 .…”