Bis(triphenylphosphine)iron tricarbonyl

Bis(triphenylphosphine)iron tricarbonyl
Identifiers
CAS Number	21255-52-7;
3D model (JSmol)	Interactive image;
ChemSpider	4807608;
PubChem CID	6097100;
	InChI InChI=1S/2C18H15P.3CO.Fe/c21-4-10-16(11-5-1)19(17-12-6-2-7-13-17)18-14-8-3-9-15-18;31-2;/h2*1-15H;;;; Key: NPCXYZUUVGQEGS-UHFFFAOYSA-N;
	SMILES [C-]#[O+].[C-]#[O+].[C-]#[O+].C1=CC=C(C=C1)P(C2=CC=CC=C2)C3=CC=CC=C3.C1=CC=C(C=C1)P(C2=CC=CC=C2)C3=CC=CC=C3.[Fe];
Properties
Chemical formula	C39H30FeO3P2
Molar mass	664.459 g·mol−1
Appearance	yellow solid
Melting point	262–266 °C (504–511 °F; 535–539 K) decomp
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Tricarbonylbis(triphenylphosphine)iron(0) is a coordination complex with the formula Fe(CO)₃(PPh₃)₂ (Ph = C₆H₅). A yellow solid, this complex is derived from iron pentacarbonyl by replacement of two carbonyl ligands by triphenylphosphine (PPh₃).

Synthesis and reactions

The title complex can be prepared by reaction of triiron dodecacarbonyl with excess triphenylphosphine:^[1]

Fe₃(CO)₁₂ + 6 P(C₆H₅)₃ → 3 Fe(CO)₃(P(C₆H₅)₃)₂ + 3 CO

(Triphenylphosphine)iron tetracarbonyl is an intermediate in the synthesis of this compound. The title complex can also be produced more efficiently by borohydride-catalyzed substitution of iron pentacarbonyl.^[2]^[3]

Protonation gives the ferrous hydride:^[4]

Fe(CO)₃(P(C₆H₅)₃)₂ + HBF₄ → [HFe(CO)₃(P(C₆H₅)₃)₂]BF₄

Both the mono- and bis(triphenylphosphine) complexes were originally described by Walter Reppe.^[5]

^ Clifford, A. F.; Mukherjee, A. K. (1966). "Iron Carbonyl Complexes of Triphenylphosphine, Triphenylarsine, and Triphenylstibine". Inorganic Syntheses. Vol. VIII. pp. 185–191. doi:10.1002/9780470132395.ch49. ISBN 9780470131671.
^ Therien, M. J.; Trogler, W. C. (1990). "Bis(Phosphine) Derivatives of Iron Pentacarbonyl and Tetracarbonyl (Tri- tert -Butylphosphine)Iron(O)". Vol. 28. pp. 173–9. doi:10.1002/9780470132593.ch45. ISBN 9780471526193. {{cite book}}: |journal= ignored (help); Missing or empty |title= (help)
^ Keiter, Richard L.; Keiter, Ellen A.; Boecker, Carol A.; Miller, David R.; Hecker, Karl H. (1997). "Tricarbonylbis(Phosphine)Iron(0) Complexes". Inorganic Syntheses. 31: 210–214. doi:10.1002/9780470132623.ch31. ISBN 9780470132623.
^ Sowa, John R.; Zanotti, Valerio; Facchin, Giacomo; Robert Angelici (1991). "Heats of Protonation of Transition-Metal Complexes: The Effect of Phosphine Basicity on Metal Basicity in CpIr(CO)(PR₃) and Fe(CO)₃(PR₃)₂". Journal of the American Chemical Society. 113 (24): 9185–9192. doi:10.1021/ja00024a026.
^ Reppe, Walter; Schweckendiek, Walter Joachim (1948). "Cyclisierende Polymerisation von Acetylen. III Benzol, Benzolderivate und hydroaromatische Verbindungen". Justus Liebigs Annalen der Chemie. 560: 104–116. doi:10.1002/jlac.19485600104.