Page 181 - CW E-Magazine (26-9-2023)

Special Report

acetic acid to vinyl acetate where the flavours and aromas in food and drink Direct synthesis of ethylene
corrosive liquid phase process was con- preparations. An eco-friendly route is and H from CO and C H
verted into vapor phase process and all proposed and is a solvent-free aldol 2 2 2 6
these involved Pd-based catalyst.] condensation reaction, followed by a K. Baamran et al have reported the title

biocatalytic cascade, which involves process using a bifunctional structured
a Baeyer-Villiger monooxygenase CaO/Cr O -V O /ZSM-5 adsorbent/
2
3
2
5
and other redox biocatalysts. (Green catalyst monolith, using 3D printing
Chem., 2023; DOI: 10.1039/D2G- method. The optimised catalyst resulted
C02866B).
Combining a supported Ru
catalyst with HBeta Zeolite to
construct a high-performance
bifunctional catalyst for one-
step cascade transformation of
benzene (B) to cyclohexylben- in 1.72 mmol/g CO capture capacity,
2
P. Rajeshwaran et al have discussed the zene (CB) 64% CO conversion, 22.4% C H con-
2
6
2
title subject and conversion of olefins to [Asahi, Japan, had introduced a novel version, and 42% C H selectivity and in
4
2
aldehydes is the cornerstone (C H goes process for selective hydrogenation of addition 45% syngas (31% H ) selecti-
2
2
4
to CH CHO). This is relevant in a num- B to cyclohexene but, at best, 50% con- vity. Catalyst has excellent selectivity.
3
ber of industrially important processes version occurs with Ru-based catalyst (ACS Sustainable Chem. Eng., 2022;
and aspects of controlling the chemo- and hence it makes sense to take the DOI: 10.1021/acssuschemeng.2c05627).
and regio-selectivity are discussed with product to CB.]
the well-defined Pd catalysts. Now the Chiral alcohols from alkenes
emphasis is on replacing Pd with other Y. Song et al have carried out the title and water: Directed evolution
cheaper catalysts, which will make it reaction using Ru-Zn-based catalyst of a styrene hydratase (SH)
more sustainable. This mini-review zeolite to carry out alkylation of B with
covers the above subject. The idea is to cyclohexene to CB. [The incentive is M. Gajdos et al have referred to the
use the first-row transition metals, Fe, that on air oxidation of CB the hydro- challenges in realising the title reaction.
Co, Cu, Ni. (Angew. Chem. Intl. Ed.; peroxide can be split to phenol and A fatty acid hydratase from Marini-
DOI: 10.1002/anie.202211016). cyclohexanone]. Under continuous- toga hydrogenitolerans was obtained
flow operating conditions, at 150 C and
o
Sequential chemo-biocatalytic 2.0 MPa, 39% yield of CB has been
synthesis of aroma compounds realised. (Ind. Eng. Chem. Res., 2022;
DOI: 10.1021/acs.iecr.2c03140).
R.D. Ceccoli et al have worked on
making 2-phenylethyl acetate (2-PEA) Hydrocarboxylation of metha-
and 2-phenylethanol (2-PE), which nol (M) to methyl acetate (MA)
are rose-like aroma compounds and
are massively used by the industry O.D. Cardenas Gonzalez et al have used
as fragrance ingredients in cosmetic Rh and Ru nanoparticles supported on
and non-cosmetic products, as well as titanate nanotubes as catalysts for the
title reaction. This vapour phase reac-
tion was carried out with CO and H as
2
2
reactants and CH I as a promoter at 1 Bar
3
and 150 C. An infrared spectroscopy
o
study was done. This is an example of
a promising catalytic system. (Catalysis
Sci. Technol., 2023; DOI: 10.1039/
D2CY01396G). Synthesis of chiral alcohols from alkenes

Chemical Weekly September 26, 2023 181

Contents Index to Advertisers Index to Products Advertised