Reactivity of (Triphos)FeBr2(CO) towards sodium borohydrides. Issue 11 (2nd July 2016)

• Record Type: Journal Article
• Authors: Mukhopadhyay, Tufan K.; Groy, Thomas L.; Smythe, Nathan C.; Gordon, John C.; Trovitch, Ryan J.
• Is Part Of: Journal of coordination chemistry. Volume 69:Issue 11/13(2016)
• Page Start: 2038
• Page End: 2046
• Publication Date: 2016-07-02
• Subjects: Iron -- coordination compounds -- triphos -- borane ligands -- hydrides; Coordination compounds -- Periodicals; 541.2242
• DOI: 10.1080/00958972.2016.1191631
• Languages: English
• ISSNs: 0095-8972

Abstract

Abstract: The addition of CO to (Triphos)FeBr2 (Triphos = PhP(CH2 CH2 PPh2 )2 ) resulted in formation of six-coordinate (Triphos)FeBr2 (CO). This coordination compound was found to have cis -bromide ligands and a mer -Triphos ligand by single crystal X-ray diffraction. Once characterized, the reactivity of this compound toward NaEt3 BH and NaBH4 was investigated. Adding 1 eq. of NaEt3 BH to (Triphos)FeBr2 (CO) resulted in formation of (Triphos)FeH(Br)(CO), while the addition of 2.2 eq. afforded previously described (Triphos)Fe(CO)2 . In contrast, adding 2.2 eq. of NaBH4 to (Triphos)FeBr2 (CO) resulted in carbonyl dissociation and formation of diamagnetic (Triphos)FeH( η 2 -BH4 ), which has been structurally characterized. Notably, efforts to prepare (Triphos)FeH( η 2 -BH4 ) following 2.2 eq. NaBH4 addition to (Triphos)FeBr2 were unsuccessful. The importance of these observations as they relate to previously reported (Triphos)Fe reactivity and recent developments in Fe catalysis are discussed. Abstract :