Synthesis of Chiral Diarylmethylamines by Cobalt‐Catalyzed Enantioselective C‐H Alkoxylation

Abstract

Chiral diarylmethylamines (DAMA) are important structural motifs widely present in pharmaceuticals, natural products, and chiral ligands. Herein, we reported a highly enantioselective synthesis of chiral DAMAs via cobalt-catalyzed enantioselective CÀ H alkoxylation strategy. The reaction features easy operation, the use of earth-abundant and cost-efficient cobalt(II) catalyst, and readily available ligand. A range of chiral DAMAs were efficiently synthesized in high yields with excellent enantioselectivities (up to 90 % yield and up to 99 % ee) through desymmetrization and parallel kinetic resolution. Moreover, this protocol was also compatible with the synthesis of chiral benzylamines via kinetic resolution.

Ruthenium Complex Optimized Contact Interfaces of NiOX Nanocrystals for Efficient and Stable Perovskite Solar Cells

“…The NiO X NPs were synthesized by chemical precipitation method according to previous reports. [ 31,32 ] The reaction activity between Ni(NO 3 ) 2 and alkali was controlled by adjusting the pH to obtain tunable particle sizes. [ 30 ] As a result, NiO X NPs with average sizes of 25, 66, and 90 nm (denoted as NP‐A, NP‐B, and NP‐C) have been obtained, as demonstrated by the dynamic light scattering (DLS) measurements ( Figure b).…”

Multifunctional Trifluoroborate Additive for Simultaneous Carrier Dynamics Governance and Defects Passivation to Boost Efficiency and Stability of Inverted Perovskite Solar Cells

“…Thus far, the record PCE obtained for PSCs is lower than the Shockley-Queisser limit and the growing attention toward stability is the dominant factor affecting their commercialization. [7][8][9] These limiting factors can be mainly attributed to the open-circuit voltage (V oc ) loss and presence of crystallographic defects in perovskite films. [10] It should be noted that the presence of non-radiative recombination sites in perovskite films and mismatched energy levels between the perovskite photoactive and transport layers act as obstacles for carrier collection and energy utilization, resulting in V oc loss.…”

Seed‐Assisted Cu‐Doped Chemical Bath Deposition for Preparing High‐Quality NiOx Hole‐Transport Layers in Perovskite Solar Cells

“…[ 12,13 ] Nickel oxide (NiO x ) is a widely used inorganic hole‐transport material in inverted PSCs due to its deep valence band (−5.4 eV), wide bandgap (>3.5 eV), suitable work function, chemical stability, optical transparency across the visible spectrum, and efficient hole collection in p–i–n PSCs. [ 14–17 ] NiO x can be synthesized using various methods, [ 18–20 ] including the wet chemical route. [ 21,22 ] Among these methods, chemical bath deposition (CBD) is a convenient solution route for preparing metal oxide transport layers such as SnO 2 [ 23,24 ] and NiO x .…”