Base‐Free Iron Catalyzed Transfer Hydrogenation of Esters Using EtOH as Hydrogen Source

Ciganda

et al. 2019

Inorg. Chem. Front.

Section: Resultsmentioning

confidence: 99%

High catalytic activity of Rh nanoparticles generated from cobaltocene and RhCl₃ in aqueous solution

Ciganda

et al. 2019

Inorg. Chem. Front.

“…In addition to the ruthenium complexes, a base‐metal catalyst based on a Fe‐Macho complex ( Fe‐3 , Figure 11) has been utilized by de Vries and co‐workers for the depolymerization of polyesters, although using transfer hydrogenation pathway, unlike the above discussed three catalysts that use molecular hydrogen for the depolymerization process [163] . Remarkably, EtOH, a renewable feedstock, was used as a hydrogen source compared to the conventionally used isopropanol.…”

Section: Depolymerization Of Plastics Using Catalytic (De)hydrogenationmentioning

confidence: 99%

Homogeneous (De)hydrogenative Catalysis for Circular Chemistry – Using Waste as a Resource

Kumar

Gao

2020

ChemCatChem

Increasing production and usage of several consumer products and energy sources have resulted in the accumulation of a substantial amount of waste products that are toxic and/or difficult to biodegrade, thus creating a severe threat to our planet. With the recently advocated concepts of circular chemistry, an attractive approach to tackle the challenge of chemical waste reduction is to utilize these waste products as feedstocks for the production of useful chemicals. Catalytic (de)hydrogenation is an atom‐economic, green and sustainable approach in organic synthesis, and several new environmentally benign transformations have been reported using this strategy in the past decade, especially using well‐defined transition metal complexes as catalysts. These discoveries have demonstrated the impact and untapped potential of homogeneous (de)hydrogenative catalysis for the purpose of converting chemical wastes into useful resources. Four types of chemical waste that have been (extensively) studied in recent years for their chemical transformations using homogeneous catalytic (de)hydrogenation are CO2, N2O, plastics, and glycerol. This review article highlights how these chemical wastes can be converted to useful feedstocks using (de)hydrogenative catalysis mediated by well‐defined transition metal complexes and summarizes various types of homogeneous catalysts discovered for this purpose in recent years. Moreover, with examples of hydrogenative depolymerization of plastic waste and the production of virgin plastic via dehydrogenative pathways, we emphasize the potential applications of (de)hydrogenation reactions to facilitate closed‐loop production cycles enabling a circular economy.

“…We were very surprised to find that there were no reports of ester reduction via hydrosilylation after 2013, though, alternative methodologies, such as hydrogenation, were reported [140,141,142,143,144,145,146]. When we subjected benzyl benzoate to catalytic reduction in the presence of polymethylhydrosiloxane (PMHS) and dpp BIANFe(η 6 -toluene) ( 31 ), only 29% of benzyl alcohol was obtained [123].…”

Section: Iron-catalyzed Hydrosilylationmentioning

confidence: 99%

Emergence and Applications of Base Metals (Fe, Co, and Ni) in Hydroboration and Hydrosilylation

Tamang

Findlater

2019

Molecules

Base metal catalysis offers an alternative to reactions, which were once dominated by precious metals in hydrofunctionalization reactions. This review article details the development of some base metals (Fe, Co, and Ni) in the hydroboration and hydrosilylation reactions concomitant with a brief overview of recent advances in the field. Applications of both commercially available metal salts and well-defined metal complexes in catalysis and opportunities to further advance the field is discussed as well.