Page 167 - CW E-Magazine (26-3-2024)

Special Report

wood. Further, this resin has excellent range of thermal stabilities, viscoelastic
thermal insulation and photothermal properties, and mechanical properties.
performances. (Green Chem., 2023/ Practical application is discussed with
DOI: 10.1039/D3GC03542E). respect to all the relevant parameters and
characteristics are comparable to well
Selective demethylation reac- known products. (Green Chem., 2023;
tion of biomass-derived aroma- DOI: 10.1039/D3GC03249C).
tic ether polymers for bio-based
lignin (L) chemicals Kilo-scale GMP synthesis of
renewable semi-synthetic vaccine
F.M. Harth et al have emphasised the grade squalene (S)
importance of demethylation in organic
glutaraldehyde. 60 PVA : 40 CMC : AA synthesis. Thus the resulting vicinal diol K.J. Fischer et al have worked on the
and 70 PVA : 30 CMC : AA with a fi xed or triol confi guration orginating from title subject as emulsions of the triter-
amount of AA. This work gave fi lms guaiacyl and synapyl L moieties are pene ((6E,10E, 4E,18E)-2,6,10,15,19,23-
with smooth texture and overall uniform of importance for adhesives and are also hexamethyltetracosa-2,6,10,14,18,22-
fi lm thickness and were stable in the useful for condensation polymerisation. hexane) which have been used as adjuvants
temperature range of 180-300°C. Soil This review gives a comprehensive in infl uenza vaccines since the 1990s. S
burial tests demonstrated degradability. account of different ways of demethyl- normally comes from shark liver oil and
These fi lms have excellent antimicrobial ation. Both acid- and base-catalysed
activity for Gram+ and Gram- bacteria. methods are covered, as well as (hydro)
(ACS Omega, 2023; DOI: 10.1021/ thermal methods (also metal catalysed).
acsomega.3C04397). These methods are discussed with res-
pect to application to L. (Green Chem.,
A multifunctional lignin (L)- 2023; DOI: 10.1039/D3GC02867D).
based composite ultra-adhesive thus needs to be avoided. A semisynthetic
for wood processing Synthesis and properties of route is reported, which meets current
linseed oil (LO)-based waterborne pharmacopeial specifi cations and is based
B. Zhan et al have worked on the title non-isocyanate polyurethane at trans-beta-farnesene ((6E)-7,4-dimethyl-
subject in the context of phenolic resin coating -3-methylene-1,6,10-dodecatriene,
adhesives being made from phenol which is made in a sustainable way via
and formaldehyde, both of which are Z. Ling and Q. Zhou have worked on LO- yeast fermentation of sugarcane. (Org.
derived from fossil fuels; besides these based cyclic carbonate, which was syn- Proc. Res. Dev., 2013; DOI: 10.1021/acs.
resins are not biodegradable. These thesised via a thiolene click reaction and opra.3C00300).
authors have worked on L and furfural (F). was followed by an esterifi cation reaction
A deep eutectic solvent (DES), L, directly from LO. A bio-based fatty acid Versatile heterogeneous cata-
and F were used and this composite diamine was used and different formula- lytic system for the selective
adhesive is a machinable adhesive for tions were studied and resulted in a broad synthesis of limonene epoxide
(LE) and diepoxide (LD)
L.A. Galle-Go-Villada et al have worked
on the epoxidation of renewable L and
these products have many uses. These
authors have used commercial MgO
as a heterogeneous catalyst of L, using
H O in a Payne reaction system, with
2
2
acetonitrile as an oxidant activator and
water and acetone as solvents. Highest
yield of LE was 80% and LD was 96%
at 50 C. The formation of peroxyaceti-
o
midic as an intermediate is reported. The

Chemical Weekly March 26, 2024 167

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