A highly efficient one-enzyme procedure using ω-transaminase promoted by molecular oxygen for preparing high enantiomeric purity chiral amines was described.
Presented here is the first example of UV (λ=210 nm) promoted procedure proceeding in aqueous media at room temperature using ambient air as the oxidant for efficient synthesis of an array of α‐ketoamides of all types using a non‐metal catalyst N‐iodosuccinimide with a loading of 20 mol%. With UV, oxygen in the air was efficiently utilized as the green oxidant, some control experiments were carried out and a plausible mechanism was proposed, disclosing that in aqueous solution, the oxidation process was actually triggered by dioxygen radical anion (O2.−), while not molecular oxygen. A variety of secondary amines and primary amines as well as ammonia were employed as the amine moieties, and the desired product primary‐, secondary‐, and tertiary α‐ketoamides were afforded in good to excellent yields of up to 96 %.
Direct ethanol fuel cells (DEFCs)
are a type of promising portable
power source with low environmental pollution and high energy density.
However, the further commercialization of DEFCs is hindered by the
incomplete oxidation of ethanol on the electrocatalysts. Herein, we
report a successful synthesis of ultrathin PdPtH nanosheets (NSs)
for the first time by the in situ formation of interstitial
hydrogen atoms accompanied by wet-chemical coreduction of Pd and Pt
precursors. The PdPtH NSs possess selectivity of 15.1% related to
C–C bond splitting for ethanol complete oxidation to CO2 through the C1 pathway at a low potential, while
the contrast selectivity is 4.8% for Pt black, 9.2% for commercial
Pd black, and 11.7 for PdH NSs, respectively. Accordingly, the PdPtH
NSs exhibited enhanced catalytic activity in comparison to the counterparts.
The mass activity toward ethanol oxidation reaction (EOR) of the PdPtH
NSs is 5.2 times and 87 times higher than that of commercial Pd and
commercial Pt, respectively. The structure stability and growth mechanism
of the PdPtH NSs were also investigated. The results of in
situ Fourier transform infrared spectra revealed a stronger
C–C bond cleavage ability and CO stripping shows the better
antipoisoning properties of the PdPtH NSs arising from the cooperation
of the PdPt alloy with interstitial H atoms.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.