Themed collection International Symposium on Green Chemistry 2022

Polymers and surfactants are used in many technological and industrial applications such as the manufacture of functional materials and coatings, personal care and pharmaceutical products, food science, paints or tertiary oil recover.

This review reports the state-of-the-art photoelectrocatalytic setups, materials, the current applicational state, and the main bottlenecks.

α-Aryl-α,α-difluoroketones were synthesized via decarboxylative arylation using diaryliodonium salts under catalyst-free conditions without organometallic intermediates. The products can be transformed into various difluorinated functional groups.

The selective hydrogenation of fluorinated arenes with polar functionalities to valuable fluorinated cyclohexanes is achieved using supercritical CO₂ as solvent in combination with Rh NPs immobilized on molecularly modified silica as catalysts.

Allylation of phenols, a widely used reaction in multistep synthetic pathways, was herein investigated using mechanochemistry and compared to more conventional synthesis in solution.

A general and practical procedure for the catalytic reduction of esters has been developed using the classical Schwartz's reagent (Cp₂Zr(H)Cl) as a catalyst.

The functionalised RhB-EtOH-I dye was identified as an efficient and reusable organocatalyst for the conversion of CO₂ and epoxides into cyclic carbonates under mild conditions.

We report the synthesis of novel elastic rubbers based on polycarbonates prepared by the terpolymerisation of CO₂ with a long-alkyl-chain epoxide and an unsaturated epoxide.

The necessity to feed the chemical industry with bio-based platform chemicals encourages the usage of a life cycle perspective in order to evaluate potentialities and drawbacks, before launching them at the industrial scale.

A heterogeneous zeolite-based photocatalyst can be used for the sustainable production of N,N-dialkylamines, which have applications in pharmaceuticals, agrochemicals and organic materials.

Industrial kraft black liquor from maritime pine was oxidised in aqueous, alkaline medium, under air, at 150 °C, with or without a CuO/TiO₂ catalyst.

Molybdate ionic liquids active for CO₂ fixation into terminal and internal epoxides without any added halide co-catalysts are described. ⁹⁵Mo-NMR spectra demonstrate the interaction and activation of CO₂ with MoO₄ species.

The chemical upcycling of poly(bisphenol A carbonate) was carried out through organocatalysis using α-hydroxyketones as nucleophiles, leading to valuable vinylene carbonates.

We report the production of biobased plasticizers for PVC starting from citric by a two-step process comprising dehydration-hydrogenation followed by a Fischer esterification.

We highlight the role of OH-treated weakly acidic ZSM-5 in the ethanol-to-ethylene at low temperature. Ethylene forms via (i) primary dimer from ethanol on Brønsted sites, followed by diethyl ether cracking on Lewis sites, and (ii) secondary cleavage of C–OH in ethanol over Brønsted sites.

Three highly crystalline and porous COFs with promising photoredox properties have been prepared. Via a post-sulfurization process, the imine-linked COFs were converted into thiazole-linked COFs, generating a highly conjugated and ultrastable photocatalyst for H₂O₂ production.

Impact of stabilisers on the catalytic performance of supported Au colloidal nanoparticles for the liquid phase oxidation of glucose to glucaric acid.

Titanium-catalyzed hydroaminoalkylation has emerged as an atom-economical, earth-abundant synthesis of N-containing products.

This work describes a mild aging-hydrolysis integrated approach to selectively produce N-acetyl-D-glucosamine from chitin in cheap and abundant CaCl₂-based molten salt hydrate solvents.

A new two-stage production route for methanol from biomass is proposed, including hydrogenolysis of methyl formate to methanol. The Cu_0.9Al₂O₄ spinel catalyst is shown to be highly active for this reaction and stable against corrosion by formic acid.

Development of high-performance materials with a high content of aromatic units and high functionality, using natural and renewable polyphenolic synthons such as naringenin and phloroglucinol.

A PLE-SPE extraction process for the anthocyanins from Jabuticaba wastes was developed using an eutectic mixture, this acting simultaneously as solvent and stabilizing agent.

An integrated extraction–separation process: extraction and selective separation of chlorophylls and betalains using thermoreversible aqueous biphasic systems.

A one-pot depolymerisation–hydrogenation xataltic process enables flavan-3-ol monomer production from condensed tannins.

In the context of the electrochemical conversion of CO₂ into valuable products, it is of crucial importance to optimise the electrochemical cell parameters towards industrially-relevant activity, selectivity and stability of the electrocatalyst.

Hydroxyl groups of several industrial grade lignins are esterified by palladium-catalyzed hydroesterification reactions with CO and olefins, fatty esters or 1,3-butadiene.

Amorphous silica-alumina are efficient and highly stable catalysts for the continuous production of biomass-derived aromatics such as mesitylene from acetone, thus adding to the potential for value creation in biorefineries.

The synergistic effect of plasmonic Au and catalytic [C₁₂]₃[PW₁₂O₄₀] NPs in a PIC system for light-driven alkene oxidation at T_room.

N-Formylation of amines to formamides was achieved at a low temperature by total utilization of the carbon atoms of glycerol derivatives as the C₁ feedstock over CuZr/5A via a ˙OH–˙OOH radical mechanism.

The poultry-processing industry generates large quantities of waste rich in keratin, a fibrous protein representing around 90 wt% of chicken feathers, which is currently disposed of by landfilling or incineration.

In this work, we present a comprehensive study and optimisation of the electrocatalytic reduction of fructose to sorbitol and mannitol over a Cu-wire cathode, which allowed enhancing the Faradaic efficiency and achieving unprecedented product yields.

The telescoped electrochemical coupling of NH₃ and CO₂ with simple aromatic olefins is described, forming valuable N-heterocycles in an atom-efficient manner with overall yields of up to 91%. The same iodide catalyst is required for both steps.

The rising demand for linear alkylbenzene surfactants (LAS) poses an environmental threat as LAS are industrially produced from petroleum using corrosive acid catalysts.

The myriad benefits of silicone polymers can be made more sustainable by replacing much of the elastomer body with acrylated soybean oil. The crosslinked copolymers are simply made without catalysts using an aza-Michael reaction.

Easy low-energy-cost preparation of a highly efficient and reusable single-atom-type structured catalyst for alkyne-to-alkene hydrogenation and Suzuki coupling.

we present a highly efficient catalytic strategies which are capable of converting DMBQ obtainable from high molecular-weight lignin-oil into industrially highly relevant and well-defined 1,4-cyclohexanediol and 1,4-cyclohexanediamine.

Epoxy motifs are versatile building blocks for use in pharmaceuticals, food additives and agrochemicals. Here, we present a highly efficient electrochemical bromide-mediated olefin epoxidation process using H₂O for a broad scope of substrates.

Natural antioxidants, such as vitamin E and eugenol, once grafted to silicone oils maintain their antioxidant activity and dilute the quantity of silicone needed for a given application.

Graphical representation of Lewis acid catalyzed ammonolysis of polyamide 66.