ConspectusTransition metal catalyzed asymmetric hydrofunctionalization of readily available unsaturated hydrocarbons presents one the most straightforward and atom-economic protocols to access valuable optically active products. For decades, noble transition catalysts have laid cornerstone in this field, on account their superior reactivity selectivity. In recent years, from an economical sustainable standpoint, first-row, earth-abundant metals received considerable attention, due high...

Abstract Recent years have witnessed the growing interest in remote functionalization of alkenes for it offers a strategy to activate challenging C–H bonds distant from initiation point via alkene isomerization/functionalization. However, catalytic enantioselective isomerization/functionalization with one single transition metal catalyst remains rare. Here we report highly regio- and cobalt-catalyzed bond borylation internal sequential isomerization/hydroboration. A chiral ligand featured...

Highly regio- and enantioselective intermolecular hydroamination of alkenes is a challenging process potentially leading to valuable chiral amines. Hydroamination via metal-catalyzed hydrogen atom transfer (HAT) with good regioselectivity functional group tolerance has been reported, however, high enantioselectivity not achieved due the lack suitable ligands. Here we report ligand-promoted cobalt-catalyzed Markovnikov-type selective radical diazo compounds. This operationally simple protocol...

Recent advances in various metal-catalysed asymmetric sequential double hydrofunctionalizations of alkynes have been highlighted this feature article.

A cobalt-catalyzed asymmetric hydroboration of styrenes using an imidazoline phenyl picoliamide (ImPPA) ligand was first reported to deliver the valuable chiral secondary organoboronates with good functional tolerance and high enantioselectivity (up >99% ee). This protocol is operationally simple without any activator. Particularly, this method can be applied in allylamine afford 1,3-amino alcohol, which a key intermediate for synthesis fluoxetine atomoxetine. Furthermore, control...

A highly Markovnikov-selective, iron-catalyzed hydroboration of styrenes is reported using available oxazolinylphenyl picolinamide as the ligand to afford branched products with up >50/1 b/l. This reaction operationally simple and could be carried out in gram scale.

Summary of main observation and conclusion A regioselective double 1,1‐hydrosilylation terminal aliphatic alkynes with primary silanes catalyzed by one cobalt catalyst has been developed. gem ‐Bis(dihydrosilyl)alkanes containing four silicon‐hydrogen bonds are efficiently constructed in an atom‐economical manner. Tolerated substrates include simplest alkyne‐ethyne, a complicated drug derivative various functionalized alkynes. Asymmetric approach using two catalysts is achieved excellent...

Abstract Regiodivergent addition reactions provide straightforward and atom‐economic approaches to access different regioisomers. However, the regio‐chemistry control all possible results is still challenging especially for reaction involving multiple steps. Herein, we reported regio‐controllable cobalt‐catalyzed sequential hydrosilylation/hydroboration of arylacetylenes, delivering regio‐outcomes with high regioselectivities (up >20/1 rr cases). Each regioisomer value‐added...

A bottleneck in the development of high-strength non-oriented silicon steels for drive motors new energy vehicles is balance strength and magnetic properties. This paper successfully tackled this problem through optimization thickness reduction hot cold rolling formation coherent precipitates using a Cu-alloyed steel. More specifically, 96% course promoted homogenization microstructure during following normalization treatment. Subsequently, deformation degree 80% ensured inheritance uniform...

Abstract The rational design for transition metals‐based carbon nano‐materials as efficient electrocatalysts still remains a crucial challenge economical electrochemical hydrogen production. Carbon nanotubes (CNTs) attractive are typically activated by non‐metal dopant to promote catalytic performance. Metals doping or metal/non‐metal co‐doping of CNTs, however, rarely explored. Herein, this work rationally designs bimetal oxide templates ZnCo 2 O 4 heterogeneously Zn and N into Co...

Abstract Double hydrosilylation of alkynes represents a straightforward method to synthesize bis(silane)s, yet it is challenging if α‐substituted vinylsilanes act as the intermediates. Here, cobalt‐catalyzed regiodivergent double arylacetylenes reported for first time involving this challenge, accessing both vicinal and geminal bis(silane)s with exclusive regioselectivity. Various novel containing Si−H bonds can be easily obtained. The gram‐scale reactions could performed smoothly....

The direct hot modification and then preparation of qualified building materials from molten slag have gained significant attention at present due to its characteristics save energy reduce CO2 emissions. Molten silicomanganese discharged 1500-1600 ℃ with high content SiO2 Al2O3 (above 50 mass%) is suitable for casting stone. For ensuring a stone, the study focused on improvement crystallization properties fluidity by composition, crystallization, structure, viscosity raw two modified slags,...

The direct hot modification and subsequent preparation of qualified building materials from molten slag has gained significant attention at present due to its characteristics saving energy reducing CO2 emissions. Molten silicomanganese slag, discharged 1500–1600 °C with high content SiO2 Al2O3 (above 50 mass%), was suitable for the casting stone. To ensure a stone, study focused on improving crystallization properties fluidity by modifying composition, crystallization, structure, viscosity....

In this work, the non‐metallic inclusions contained in a trial X70 pipeline steels are characterized by optical microscopy, scanning electron energy‐dispersive X‐ray spectrum, and transmission microscopy. Statistical analysis is conducted to summarize size shape of inclusions. The hydrogen trapping resulting hydrogen‐induced cracking (HIC) susceptibility tested. Density functional theory used calculate binding energy at MnS inclusions, impact on HIC evaluated. It found that majority...

The optimization of magnetic and mechanical properties by microstructure modification is tremendously challenging for high-grade non-oriented silicon steel. In the current study, cold-rolled steel was modified recrystallization annealing to achieve high strength good properties. results indicate that significantly improved properties, while negatively impacting its At early stage (<2 min), nucleation occurred in deformation matrix, leading a significant decrease dislocation density. This...

Abstract A key consensus of implementing large‐scale water splitting is developing highly efficient, durable, and earth‐abundant electrocatalysts for oxygen evolution reaction (OER). In recent years, the Fe‐based materials used in OER have attracted researchers’ great attention around globe, Fe has been identified as active sites. this study, we firstly synthesized coral‐like FeSe/FeSe 2 heterostructure catalyst via a one‐pot solvothermal method. We demonstrated that different components can...

Herein, considerable insight is provided into the evolution of strain‐induced martensite and mechanical properties Fe–19Cr–4Ni–3Mn–0.15N–0.15C wt% austenitic stainless steel (in short Cr19NC15.15) during deformation at room temperature cryogenic temperatures. In situ magnetic measurements tensile tests various temperatures are conducted. The triggering stress required for formation determined minimum in strain hardening curve. It found that with reducing range from 0 to –20 °C slightly...

We report a cobalt-catalyzed desymmetrizing isomerization of exo-cyclic alkenes to generate chiral 1-methylcyclohexene derivatives with good yields and enantioselectivities. A novel thiazolinyl iminoquinoline ligand its cobalt complex were designed synthesized control the establishment tertiary or quaternary carbon centers at remote position. This protocol is operationally simple, model for stereochemical outcome has been proposed.

The development of cost-effective transition metal catalysts for oxygen evolution reaction (OER) is critical the production hydrogen fuel from water splitting. Low-cost and efficient stainless steel-based are expected to replace scarce platinum group metals large-scale energy applications. Here in this work, we report conversion commonly available inexpensive easily accessible 434-L steel (SS) into highly active stable electrodes by corrosion sulfuration strategies. Nix Fe1-x S layer as a...

Effects of chromium additions on the microstructure, ordered phase and magnetic properties Fe-6.5 wt.% Si alloy fabricated by hot-rolling warm-rolling were investigated. The results showed that reduced grain size effectively, dislocation density was with increasing content. amount in content 1.0wt%. not deteriorated.