Knölker complex

The Knölker complex is an organoiron compound, which is a catalyst for transfer hydrogenation.^[1] The complex features an hydroxycyclopentadienyl ligand bound to an Fe(CO)₂H centre. It is generated by the corresponding cyclopentadienone tricarbonyl by treatment with base followed by acidification.^[2] It is named for Hans-Joachim Knölker [de] The compound is related to the organoruthenium compound called Shvo's complex, a hydroxycyclopentadienyl derivative that also functions as a catalyst for hydrogenation.^[3]

Knölker complex

Names
IUPAC name Dicarbonylhydro[(1,2,3,3a,7a-η)-4,5,6,7-tetrahydro-2-hydroxy-1,3-bis(trimethylsilyl)-1H-inden-1-yl]iron
Identifiers
CAS Number	243866-64-0 Y
3D model (JSmol)	Interactive image
InChI InChI=1S/C15H27OSi2.2CO.Fe.H/c1-17(2,3)14-11-9-7-8-10-12(11)15(13(14)16)18(4,5)6;2*1-2;;/h16H,7-10H2,1-6H3;;;;/q-1;;;+1; Key: SOJBHSHALNCIOI-UHFFFAOYSA-N
SMILES [H-][Fe+2]1234(C#O)(C#O)C5(O)=C4(C=63CCCCC62[C-]51[Si](C)(C)C)[Si](C)(C)C
Properties
Chemical formula	C17H28FeO3Si2
Molar mass	392.423 g·mol−1
Solubility in water	polar organic solvents
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references