Efficient and recyclable solid catalysts for the hydrosilylation of olefins are highly desirable, both to reduce the economic and environmental costs of traditional homogeneous processes and to ...improve the health properties of products that find a number of uses in daily life. In this account we critically review selected examples amongst the numerous platinum‐based materials developed in the last decade, with the goal of identifying important challenges in this relevant domain of synthetic organic chemistry.
Efficient and recyclable hydrosilylation solid catalysts are highly desirable, and the first materials suitable for practical application are eventually emerging.
A new series of nanostructured platinum catalysts able to catalyze the selective reduction of nitroarenes has been developed. The materials, made of organosilica physically doped with nanostructured ...platinum(0), are stable and efficient. Reactions in general proceed with high yield and often go to completion, while the catalysts can be reused in further reaction runs. This establishes a new class of relevant solid catalysts for synthetic organic chemistry named SiliaCat Platinum‐Hydrogel.
Silver catalysis has a rich and versatile chemistry now expanding from processes mediated by silver complexes and silver nanoparticles to transformations catalyzed by silver metal organic alloys and ...single-atom catalysts. Focusing on selected recent advances, we identify the key advantages offered by these highly selective heterogeneous catalysts. We conclude by offering seven research and educational guidelines aimed at further progressing the field of new generation silver-based catalytic materials.
Citation-based metrics such as the
-index and the journal impact factor continue to play a key role in the evaluation of scholarships for employment, promotion, and tenure in academia, as well as in ...funding decisions. As happens with most scientometric aspects concerning their discipline, knowledge of citation patterns in chemistry in the chemistry community is rather limited. Critically reviewing the outcomes of studies devoted to citations in chemistry and adding new insight from the analysis of contemporary chemistry research, this study aims to fill at least in part knowledge gaps concerning publishing, citations, and citation habits in the chemical sciences.
An HS-SPME GC-MS analysis of the volatile compounds adsorbed at the outer surface of lemon and grapefruit pectins obtained via the hydrodynamic cavitation of industrial waste streams of lemon and ...grapefruit peels in water suggests important new findings
to understanding the powerful and broad biological activity of these new pectic materials. In agreement with the ultralow degree of esterification of these pectins, the high amount of highly bioactive α-terpineol and terpinen-4-ol points to limonene (and linalool) decomposition catalyzed by residual citric acid in the citrus waste peel residue of the juice industrial production.
The use of biobased polymers or natural inorganic materials in place of synthetic polymers or liquid crystals derived from petroleum to fabricate optical components establishes the concept of ...“sustainable optics”, at least for what concerns the environmental dimension of sustainability as these polymers are renewable and often biodegradable or compostable. To identify the main obstacles to be addressed prior to industrial uptake of these polymeric resins in the optics industry, we focus on two promising and widely studied biobased polymeric materials, namely nanocellulose and poly(limonene carbonate). The conclusions have implications also for the emerging bioeconomy and the undergoing reshaping of the chemical industry driven by sustainability megatrend.
The electrocatalytic oxidation of alcohols at the surface of stable catalytic electrodes functionalized with aminoxyl radicals results in a waste‐free process affording highly valued carbonyl or ...carboxylic compounds using an electric current only. Hydrogen is the only by‐product of the reaction, no hazardous chemical oxidants are used throughout the process, whereas the separation of the valued reaction product from cytotoxic and genotoxic TEMPO‐like radicals is no longer required. We provide a critical insight on the economic, technological, and educational issues that, in our viewpoint, will drive the uptake of this eminently green and highly effective synthetic organic chemistry technology in the fine chemical and pharmaceutical industries.
Limonene epoxide (1,2-limonene oxide) readily reacts with carbon dioxide inserted in a ring-opening copolymerization reaction and forms polycarbonates of exceptional chemical and physical properties. ...Both poly(limonene carbonate) and poly(limonene dicarbonate) can be synthesized using low-cost Zn or Al homogeneous catalysts. This study addresses selected relevant questions concerning the technical and economic feasibility of limonene and carbon dioxide polymers en route to the bioeconomy.
An innovative catalyst is reported for removing suspect carcinogen trichloroacetic acid (TCA) found in water after chlorination. SilverSil, a methyl-modified silica xerogel doped with Ag ...nanoparticles, shows remarkably high and stable activity as heterogeneous catalyst for the reductive dehalogenation of TCA with NaBH
as reducing agent. Chloroacetic acid and acetic acid are the main products of the highly reproducible reductive dehalogenation. The low cost, high stability and ease of application of the SilverSil sol-gel catalyst to continuous processes open the route to the industrial uptake of SilverSil to free chlorinated waters from a probable human carcinogenic agent exerting significant genotoxic and cytotoxic effects.
Fish oil rich in long‐chain polyunsaturated fatty acids, vitamin D3 and carotenoid pigments have been sustainably extracted from anchovy fillet leftovers using biobased limonene. The oil is ...conveniently stabilized by adsorption on periodic mesoporous silicas. The simplicity of the process, the high load of fish oil, and the biocompatible nature of mesoporous silica support numerous forthcoming applications of this new class of “Omeg@Silica” materials.
Sustainable extraction: Fish oil rich in long‐chain polyunsaturated fatty acids, vitamin D3 and carotenoid pigments have been sustainably extracted from anchovy fillet leftovers using biobased limonene. The oil is conveniently stabilized by adsorption on periodic mesoporous silicas. The simplicity of the process, the high load of fish oil, and the biocompatible nature of mesoporous silica support numerous forthcoming applications of this new class of “Omeg@Silica” materials.
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