|Systematic IUPAC name
disodium iron tetracarbonyl, Collman's reagent
3D model (JSmol)
|Density||2.16 g/cm3, solid|
|Solubility||tetrahydrofuran, dimethylformamide, dioxane|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|(what is ?)|
Disodium tetracarbonylferrate is the organoiron compound with the formula Na2[Fe(CO)4]. It is always used as a solvate, e.g., with tetrahydrofuran or dimethoxyethane,. which bind to the sodium cation. An oxygen-sensitive colourless solid, it is a reagent in organometallic and organic chemical research. The dioxane solvated sodium salt is known as Collman's reagent, in recognition of James P. Collman, an early popularizer of its use.
When a deficiency of sodium is used, the reduction affords deep yellow octacarbonyl diferrate:
Some specialized methods do not start with iron carbonyl.
It is used to synthesise aldehydes from alkyl halides. The reagent was originally described for the conversion of primary alkyl bromides to the corresponding aldehydes in a two-step, "one-pot" reaction:
Disodium tetracarbonylferrate reacts with alkyl halides (RX) to produce alkyl complexes: