Iron(0) tricarbonyl η⁴-1-azadiene complexes and their catalytic performance in the hydroboration of ketones, aldehydes and aldiminesviaa non-iron hydride pathway

Abstract

Iron(0) tricarbonyl η4-1-azadiene complexes catalyse the hydroboration of aldehydes, ketones, and aldimines with pinacolborane as a hydride source via an intermolecular hydride transfer pathway rather than an iron-hydride intermediate.

The reaction of nonacarbonyldiiron with 8‐alkynyloxyquinolines: Alkynyl activation, cyclization via C‐N bond formation, and C‐H bond cleavage

“…The bond distance of C12-C13 in 2 is 1.421( 5) Å (Table 2 and Figure 4), falling in the range between a single bond and a double bond, which is consistent with bond elongation caused by η-bonding between a metal center and a C=C bond. [44][45][46][47] For example, in iron(0) tricarbonyl η 4 -1-azadiene complexes ([Fe 0 (CO) 3 (η 4 -N(R 1 ) = C-C=C(R 2 )]), the distance of C=C bond is ca. 1.41 Å.…”

“…1.41 Å. 47 Therefore, the coordination of the bond C12-C13 to the iron center is a η 2 -bonding between a vinyl bond and a metal center. Its activity in NMR and the five-coordinated nature imply that the iron center is Fe(0) in complex 2.…”

Air-Stable Iron(III) Salen Complexes for Selective Hydroboration of Ketones and Unactivated Imines without Base Activation

“…In this scenario, iron-based catalysts have garnered significant attention owing to their promising catalytic activity, ready availability, and cost-effectiveness. Although the hydroboration of alkenes and alkynes using iron catalysts has been well established in recent years, reports particularly focusing on iron-catalyzed hydroboration of ketones are scarce in the literature. For instance, in 2017, Findlater and Tamang developed a novel approach for the hydroboration of aldehydes and ketones by utilizing Fe­(acac) 3 as a catalyst, along with an additive NaHBEt 3 , to generate an active Fe–H intermediate species responsible for the catalytic activity.…”