A convenient approach to selectively prepare a wide range of functionalized propiolic acids was developed by AgI-catalyzed carboxylation terminal alkynes using carbon dioxide as carboxylative agent under ligand-free conditions.

Chiral iminopyridine oxazoline (IPO) ligands were designed, synthesized and utilized for the first cobalt-catalyzed highly regio- enantioselective anti-Markovnikov hydroboration of 1,1-disubstituted aryl alkenes. These novel IPO will likely be high value asymmetric transformations with first-row transition metals.

Here, we reported for the first time an iron-catalyzed highly enantioselective hydrogenation of minimally functionalized 1,1-disubstituted alkenes to access chiral alkanes with full conversion and excellent ee. A novel 8-oxazoline iminoquinoline ligand its iron complex have been designed synthesized. This protocol is operationally simple by using 1 atm hydrogen gas shows good functional group tolerance. primary mechanism has proposed deuterium-labeling experiments.

The visible-light-promoted diastereodivergent intramolecular oxyamination of alkenes is described to construct oxazolindinones, pyrrolidinones and imidazolidones via mild generation primary amidyl radicals from functionalized hydroxylamines. A unique phenomenon highly diastereoselective ring-opening aziridines controlled by electron sacrifices was observed. Highly amino alcohols derivatives were obtained efficiently through this protocol in gram scales. mechanistic studies suggested the...

Dual catalyst-controlled intramolecular unactivated C(sp3)-H amination and oxygenation of carbamates merging visible-light photocatalysis earth-abundant transition metal catalysis have been reported. Useful amino alcohol diol derivatives could be selectively obtained from readily available tertiary derivatives. The possible mechanisms proposed via a 1,5-HAT process followed by Lewis acid-controlled cyclization. nickel zinc catalysts inhibit the formation products, respectively. An...

The first nitro-group-initiated redox-neutral [3+2] cycloaddition of nitrocyclopropanes with alkenes by using visible-light-absorbing transition-metal complexes was reported. High diastereoselectivities were observed for two quaternary carbon centers on the ring and validated DFT calculations. Spiro- or polycyclic structures can be constructed smoothly. Cyclic γ-amino acid derivatives polysubstituted cyclic amino alcohols obtained easily through reduction nitro group.

Abstract A novel difunctionalization of unactivated alkenes has been reported via visible light‐promoted three‐component carboazidation using TMSN 3 and acrylonitrile as partners without any stoichiometric oxidants. This protocol is operationally simple for straightforward access to azido derivatives with good functional group tolerance from readily available starting materials. facile radical‐catalyzed [3 + 2] cycloaddition reaction vinylcyclopropane was also observed deliver a...

Polyurethane binder systems based on hydroxyl-terminated polybutadiene (HTPB) possess several superior properties such as adhesion, high solid-loading capacity, outstanding mechanical performance, etc. They have been widely used in coatings and adhesives well medical military industries. The cure reaction between diisocyanates plays a key role the of final products adjustment process parameters. FT-IR spectroscopy is applied to investigate kinetics curing HTPB isophorone diisocyanate (IPDI)...

A highly efficient low-valent tungsten-catalyzed deoxygenative reduction of tertiary amides to amines with pinacolborane (HBpin) is developed. This protocol uses commercially available W(CO)6 as catalyst in a solution hexane...

Herein, a series of new 8-OIQ cobalt complexes were synthesized and used for cobalt-catalyzed chemo- enantioselective 1,4-hydroboration enones with HBpin to access chiral β,β-disubstituted ketones good excellent enantioselectivties. This protocol is operationally simple shows broad substrate scope.

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.

A cobalt-catalyzed multipositional isomerization of conjugated dienes has been reported for the first time using an 8-oxazoline iminoquinoline ligand. This reaction is operationally simple and atom-economical readily available starting materials with E/Z mixture to access disubstituted 1,3-dienes excellent yields good E,E stereoselectivity. The mechanism via alkene insertion cobalt hydride species β-H elimination a π-allyl intermediate proposed on basis deuterium labeling control experiments...

In this paper, the first-principles calculation method based on density functional theory is used to calculate structure of CoCr2O4 and Mn-doped Mn0.1Co0.9Cr2O4 low-refractive-index surface (100) adsorption model NH3 other molecules. Moreover, process NOx removal reaction with was studied in detail. The results showed that energy amount Mulliken charge transfer increased after Mn doping. projected states indicates interactions between adsorbed molecule substrate are stronger. It worth noting...

Abstract Nowadays, the droplet–particle collision characteristics in gas‐phase ethylene polymerization process are still unclear. The high‐speed photography and a quasi‐circle imaging approach employed to study interaction between liquid droplets polyethylene particles. film evolution is studied through variations of thickness on particle north pole, dynamic contact angle, center angle at maximum extension. Results have found that for n ‐hexane threshold temperature recoil happening...

Abstract A carboxylative coupling reaction of various primary amine and 3‐phenyl‐2‐propynyl or 2‐nonynyl chloride in the presence 8‐diazabicyclo[5.4.0]undec‐7‐ene (DBU) using carbon dioxide as reagent was presented. This transition‐metal free system shows broad substrate scope gives a series propargylcarbamates moderate to good yield. The obtained N ‐alkyl substituted carbamate product can undergo base‐catalyzed intramolecular cyclization afford functionalized 4‐methylene‐2‐oxazolidinone

The catalytic reduction performance of NO on the surface Fe-doped ZnAl2O4 (100) was calculated based DFT. adsorption and other molecules, change reaction energy CH4 C2H4 as reducing agents, activation barrier were studied. It found that best is -2.166 eV. Compared with Al Zn sites, doped Fe atoms are better sites. At temperatures 300 K 600 K, molecules will move in direction atoms. O2 repel NO, reduce its energy, cause to lose electrons be oxidized. enthalpy agent -7.02 eV, -3.45 Transition...

A series of mildly oxidized graphene oxide (MOGO) reinforced polydicyclopentadiene composites (MOGO/polyDCPD) were prepared via the in situ polymerization DCPD presence MOGO using ring-opening metathesis (ROMP). The inter-crosslinking networks between and polyDCPD backbones formed composite structures, examined qualitatively by swelling tests. Bending tests, DMA TGA measurements employed to study optimal loading content for achieving best mechanical thermal properties MOGO/polyDCPD...