Page 168 - CW E-Magazine (9-1-2024)

Special Report

by running the reactor in a transient mode cyclohexanol, which can be converted 60-99% of 1-octene got isomerised to
so that the branched isomers can be recove- to cyclohexanone for Nylon 6.] 2- and 3-octenes before the formation of
red from the exiting gas mixture during aldehydes. DFT calculations were done.
the early stages of transience. Thus, This process continues to attract atten- (Angew. Chem. Intl. Ed.; DOI: 10.1002/
reaction and separation can be realised tion in view of its potential and J. Yu et anie.202302777).
in a single fixed bed device. (Chem. Ing. al have made the state-of-the-art title
Technik; DOI: 10.1002/cite.202300005). catalyst via a novel wet-chemistry Non-oxidative coupling of meth-
reaction – adsorption strategy through the ane: Interplay of catalyst inter-
Traffic lights for catalysis: facile acid-base interaction. This catalyst face and gas phase mechanisms
Stimuli-responsive molecular was fully characterised and the role of
and extended catalytic systems Zn is reported. The particle size of Ru There has been a lot of interest for a
matters. High selectivity for cyclohexene long time on the title reaction where
G.C. Thaggard et al have discussed this is reported. (Ind. Eng. Chem. Res., 2023; harsh conditions like temperature above
fascinating subject and given a reference DOI: 10.1021/acs.iecr.3c00040). 800 C is employed and here the catalyst
o
to “just as flowers blooming in response to stability is limited and deactivation and
the sun attract bees to continue their natu- Ultra-uniform Ru nanoclusters strong coking occurs. Metal carbides
ral life cycle, molecules which respond to as efficient hydrogenation cata- play a crucial role. This study provides
external stimuli can be used to control cata- lysts for phthalates clues to arrive at a rational catalyst de-
lytic cycles.” These authors have covered sign. (S.B.X.Y. –Zhang and C. Coperet,
advances made in this field in the last five Y. Sun et al have referred to the envi- Chimia, 2023, 77, No. 4; DOI: 10.2533/
years. There is a discussion on metal-free ronmentally friendly plasticiser based chimia.2023.206).
catalysts and organometallic complexes,
on the hydrogenation of di-2-ethylhexyl/
di-isononyl phthalates. A series of Visible light-driven C(Sp )-H
3
ultra-uniform Ru nanoclusters supported carboxylation of diverse amines
with CO into α-amino acids
2
using an eco-friendly and reusable
covalent organic framework
(COF)

P. Chakrabortty et al have come out
with the title reaction in a novel way by
using crystalline polyimide-based COF
(PI-COF) as an efficient heterogeneous
as well as biomimetic systems, which photocatalyst and NiO nanoparticles as
display switchable catalytic activity for a on gamma-alumina were made and used a co-catalyst under ambient conditions
variety of reactions. Photochromic mole- for the hydrogenation of diisononyl (room temperature and atmospheric
cules are possible to be modulated with phthalate. 100% selectivity was reali- CO pressure). Diverse amino acids
2
light activation to influence rate, yield or sed. (Ind. Eng. Chem. Res., 2023; DOI: have been made with moderate-to-high
enantioselectivity. (Angew. Chem. Intl. 10.1021/acs.iecr.3c00130). yields. A range of functional groups can
Ed.; DOI: 10.1002/anie.202302859).
Hydroformylation (oxo) reac-
Novel reaction-adsorption tions
method for preparation of Ru-
Zn-La/ZrO catalysts with high F. Guan et al have combined the concept
2
catalytic performance for selec- of flash chemistry and radial synthesis
tive hydrogenation of benzene and a novel microreactor (Flashstop
[Asahi, Japan, commercialised the reactor) to study the isomerisation pro-
selective hydrogenation of benzene to cess of hydroformylation, using a Rh/
cyclohexene, with about 50% selecti- tetraphosphite catalyst. These authors
vity, and conversion via hydration to observed that in the initial 313 sec.,

168 Chemical Weekly January 9, 2024

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