Platinum Group Metals: Green Recovery from Spent Auto-Catalysts and Reuse in New Catalysts—A Review

Crystals, Journal Year: 2023, Volume and Issue: 13(4), P. 550 - 550

Published: March 23, 2023

This manuscript reviews the current trends in recovery of Platinum Group Metals (PGMs) from end-of-life autocatalysts and aims recently funded Marie Sklodowska-Curie Project “Chemistry Metals-CHemPGM” towards greening PGMs processes reusing recovered for preparation new catalysts. Together with analysis state art spent through pyrometallurgical hydrometallurgical routes recent reducing their environmental impact, also emerging sustainable green technologies are analyzed. Particular focus is given on mechanochemical processing as a promising route not only pretreatment waste materials but direct leaching. The present review identifies catalysts carbon neutrality few efforts developing PGM-based starting directly liquor leach solutions envisaging therefore possible key to close loop more efficient way.

Language: Английский

---

A universal ligand for lead coordination and tailored crystal growth in perovskite solar cells

Energy & Environmental Science, Journal Year: 2024, Volume and Issue: 17(4), P. 1549 - 1558

Published: Jan. 1, 2024

Chemical environment and precursor-coordinating molecular interactions within a perovskite precursor solution can lead to important implications in structural defects crystallization kinetics of film. Thus, the opto-electronic quality such films be boosted by carefully fine-tuning coordination chemistry precursors

Language: Английский

---

Organic Superbases in Recent Synthetic Methodology Research

Chemistry - A European Journal, Journal Year: 2020, Volume and Issue: 27(13), P. 4216 - 4229

Published: Aug. 26, 2020

Abstract Organic superbases are a distinct and increasingly utilized class of Brønsted base that possess properties complementary to common inorganic bases. This Concept article discusses recent applications commercial organic in modern synthetic methodologies. Examples the advantages three areas highlighted, including discovery new base‐catalyzed reactions, optimization reactions require stoichiometric base, high‐throughput experimentation technology.

Language: Английский

---

Hydroaminoalkylation for the Catalytic Addition of Amines to Alkenes or Alkynes: Diverse Mechanisms Enable Diverse Substrate Scope

Journal of the American Chemical Society, Journal Year: 2022, Volume and Issue: 144(26), P. 11459 - 11481

Published: June 22, 2022

Hydroaminoalkylation is a powerful, atom-economic catalytic reaction for the of amines with alkenes and alkynes. This C–H functionalization allows alkylation using simple or alkynes as alkylating agents. transformation has significant potential transformative approaches in pharmaceutical, agrochemical, fine chemical industries preparation selectively substituted N-heterocycles shows promise materials science synthesis functional responsive aminated materials. Different early transition-metal, late photoredox catalysts mediate hydroaminoalkylation by distinct mechanistic pathways. These insights have resulted development new conditions to realize broad range substrates: activated unactivated, terminal internal, C–C double triple bonds aryl alkyl primary, secondary, tertiary amines, including N-heterocyclic amines. By deploying select specific substrate combinations, control over regioselectivity, diastereoselectivity, enantioselectivity been realized. Key barriers widespread adoption this include air moisture sensitivity transition-metal well heavy dependence on amine protecting directing groups photocatalytic routes. Advances improved catalyst robustness, scope, regio-/stereoselective reactions early- catalysts, catalysis, are highlighted, opportunities further included. perspective that be disruptive strategy from alkenes.

Language: Английский

---

Enantioselective synthesis of tetrasubstituted allenes via addition/arylation tandem reaction of 2-activated 1,3-enynes

Science China Chemistry, Journal Year: 2023, Volume and Issue: 66(2), P. 526 - 533

Published: Jan. 9, 2023

Language: Английский

---

Comprehensive Review on the Use of Biocides in Microbiologically Influenced Corrosion

Microorganisms, Journal Year: 2023, Volume and Issue: 11(9), P. 2194 - 2194

Published: Aug. 30, 2023

A microbiologically influenced corrosion (MIC) causes huge economic losses and serious environmental damage every year. The prevention control measures for MIC mainly include physical, chemical, biological methods. Among them, biocide application is the most cost-effective method. Although various biocides have their own advantages in preventing treating MIC, problem of polluting environment increasing microorganism resistance. Therefore, it has stimulated exploration continuously developing new environmentally friendly efficient biocides. In this review, research progress used to prevent are discussed. Also, review provides a resource rational use regarding mitigation prevention.

Language: Английский

---

Chiral guanidine catalyzed cyclization reactions of 1,3-enynes for lactone synthesis: switchable H-bond catalysis

Organic Chemistry Frontiers, Journal Year: 2024, Volume and Issue: 11(10), P. 2897 - 2904

Published: Jan. 1, 2024

Cyclization and 1,4-conjugate addition/cyclization between 2-activated 1,3-enynes azlactones were achieved with chiral guanidine-amides for enol-type activation to yield a range of δ-lactone derivatives.

Language: Английский

---

The chemistry and biology of guanidine secondary metabolites

Natural Product Reports, Journal Year: 2020, Volume and Issue: 38(3), P. 586 - 667

Published: Oct. 6, 2020

Covering: 2017-2019Guanidine natural products isolated from microorganisms, marine invertebrates and terrestrial plants, amphibians spiders, represented by non-ribosomal peptides, guanidine-bearing polyketides, alkaloids, terpenoids shikimic acid derived, are the subject of this review. The topics include discovery new metabolites, total synthesis guanidine compounds, biological activity mechanism-of-action, biosynthesis ecological functions.

Language: Английский

---

Mono- and Bimetallic Aluminum Alkyl, Alkoxide, Halide and Hydride Complexes of a Bulky Conjugated Bis-Guanidinate(CBG) Ligand and Aluminum Alkyls as Precatalysts for Carbonyl Hydroboration

Inorganic Chemistry, Journal Year: 2020, Volume and Issue: 59(7), P. 4693 - 4702

Published: March 11, 2020

Tetra-aryl-substituted symmetrical conjugated bis-guanidine (CBG) ligands such as L1-3 (3H) [L(3H) = {(ArHN)(ArHN)C═N-C═NAr(NHAr)}; Ar 2,6-Me2-C6H3 (L1(3H)), 2,6-Et2-C6H3 (L2(3H)), and 2,6-iPr2-C6H3 (L3(3H))] have been employed to synthesize a series of four- six-membered aluminum heterocycles (1-8) for the first time. Generally, complexes bearing N,N'- chelated guanidinate β-diketiminate/dipyrromethene ligand systems form heterocycles, respectively. However, has capability forming both possessing multimetal centers within same molecule; this is due presence three acidic protons, which can be easily deprotonated (at least two protons) upon treatment with metal reagents. Both mono- dinuclear alkyls mononuclear alkoxide, halide, hydride structurally characterized. Further, we demonstrated potential mononuclear, CBG dialkyls in catalytic hydroboration broad range aldehydes ketones pinacolborane (HBpin).

Language: Английский

---

Enantioselective [1,2]-Stevens rearrangement of thiosulfonates to construct dithio-substituted quaternary carbon centers

Chemical Science, Journal Year: 2022, Volume and Issue: 13(14), P. 4103 - 4108

Published: Jan. 1, 2022

An asymmetric [1,2] Stevens rearrangement was realized via chiral guanidine and copper( i ) complexes. A series of novel dithioketal derivatives were obtained with good yields (up to 90% yield) enantioselectivities 96 : 4 er).

Language: Английский

---