Page 182 - CW E-Magazine (14-11-2023)

Special Report

catalyst per hour in the H-type electro- The era of stable electrocata- regenerated at the anode through electro-
lytic cell. DFT calculation were done. lysis oxidation and the targeted PBQ got
This seems to be promising method accumulated in the electrolyte solution.
(Angew. Chem .Intl. Ed.; DOI 10.1002/ A.R. Zeradjanin has referred to the Diagnostics are reported; the highest PBQ
anie.2023 07355). chlor-alkali industry as one of the largest yield improved to 47% (ChemElectro-

Bioelectrocatalytic synthesis global electricity consumers. 1970’s saw Chem; DOI: 10.1002/celc.2023300187).
the emergency of Dimensionally Stable
D. Boucher et al have covered concepts Anodes (DSAs), which allowed drastic Green electrochemical synthesis
and applications of the title synthesis savings in electricity consumption. of the 6,7-dihydroxycoumarin
to make value-added chemicals. Here Fundamental aspects were delineated derivative and electro-nitration
the use is made of specificity and much later. (Nature Catalysis, 2023, 6, of some flavonoids
selectivity of biocatalytic, enzymatic or 458-459).
microbial species to carry out chemical S. Torabi et al have reported one-pot elec-
Electrocatalytic synthesis of trochemical/nitration of (E)-3-(3,4-di-
DMF from market-surplus hydroxyphenyl)acrylic acid (3,4-DHPA)
trimethylamine (TMA) with H and electro-nitration of two polyphenol
2
production derivatives (rutin and quercetin) have

M. Jin et al have reported the title pro-
cess under ambient conditions through
direct-oxidation of TMA. 80% yield
redox transformations, using electrical is reported with over 50% Faradaic
processes. Thus, green and sustainable efficiency in an H-cell reactor having
synthesis of pharmaceuticals, com- graphite anode, coupled with H pro- been performed in divided cell. The in
2
modity chemicals, fuels, etc. can be duction at the cathode. Continuous DMF vitro biological assessment (of anti-bac-
approached. There are high barriers production in a flow reactor was also terial activity) was carried out. (ACS
for adopting this strategy. Key studies carried out. Even high selectivity of over Sustainable Chem. Eng., 2023; DOI:
illustrating the vital application of this 90% is reported (Green Chem. 2013; 10.1021/acsuschemeng.3c01616).
method are outlined (examples of NH , DOI: 10.1039/D3GC 01406A).
3
small-molecules synthesis, multi-carbon Sustainable electrochemi-
products are quoted). Further directions Scaled oxidative flow electro- cal synthesis of Mefenpyr-di-
are provided (Angew. Intl. Ed.; DOI: synthesis of 3-alkyl adipic acids ethyl (MP)
10.1002/anie.2023 07780). from 4-alkylcyclohexanols
Recent progress of dual-site R. J-R. Bednare et al have, as an example, M. Linden et al have worked on MP her-
catalysts in emerging electro- used 4-ethylcyclohexanol, which can be bicide in a simple undivided electrolysis
catalysis derived from lignin, to synthesise 3-ethyl cell with non-hazardous aqueous NaI as
supporting electrolyte and mediator via
M. Zhou et al have reviewed this subject adipic acid. Experiments were done in the (E)- or (Z)-hydrazine. Excess reagents
where electrocatalysts with high-effi- flow electrolysis (Org. Proc. Res. Dev., are recycled; scale-up was done. (Green
ciency are important, particularly for 2023; DOI: 10.1021/acs.oprd. 3c00146). Chem., 2023; DOI: 10.1016/D3GC
multi-step reactions. There is remarkable 02118A).
progress in Dual-Site Catalysts (DSCs); Cu and Co-catalysed selective
e.g., hydrogen evolution reaction (HER), electrooxidation of phenol (P) Solid-polymer electrolyte (SPE)
oxygen evolution reaction (OER), oxy- to p-benzoquinone (PBQ) under electrolysis of urea aqueous
gen reduction reaction (ORR), and CO mild conditions solutions for H synthesis
2
reduction reaction (CO RR). A systema- 2
2
tic account is reported and guidelines W. Xu et al have reported the title pro- A. Okano et al have referred to urea as
to the catalyst design are reported (Cat. cess of potential industrial interest by one of the promising H sources due to
2
Sci. Technol., 2023; DOI: 10.1039/ using Co and Cu under mild con- its high energy density, safety, and abun-
2+
3+
D3CY00456B). ditions. These ions are continuously dance. Ni/Ti-mesh anode gave a high
182 Chemical Weekly November 14, 2023

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