The first phosphine-catalyzed highly enantioselective [3 + 3] cycloaddition of Morita–Baylis–Hillman carbonates with C,N-cyclic azomethine imines is described. Using a spirocyclic chiral phosphine as the catalyst, novel class pharmaceutically interesting 4,6,7,11b-tetrahydro-1H-pyridazino[6,1-a]iso-quinoline derivatives were obtained in high yields good to excellent diastereoselectivities and extremely enantioselectivities (98–>99% ee).

An enantioselective synthesis of pharmaceutically important spirobarbiturates has been achieved via spirocyclic chiral phosphine-catalyzed asymmetric [4 + 2] annulation barbiturate-derived alkenes with allenoates. With the use this tool, various spirobarbiturate-cyclohexenes are obtained in good to excellent yields diastereo- and enantioselectivities. A wide range α-substituted allenoates were tolerated.

Supraparticles are spherical colloidal crystals prepared by confined self-assembly processes. A particularly appealing property of these microscale structures is the structural color arising from interference light with their building blocks. Here, we assemble supraparticles high order that exhibit coloration uniform, polyhedral metal-organic framework (MOF) particles. We analyse as a function size anisotropic blocks and internal structure. attribute angle-dependent MOF to presence ordered,...

Asymmetric olefin isomerization can be appreciated as an ideal synthetic approach to access valuable enantioenriched C═C-containing molecules due the excellent atom economy. Nonetheless, its occurrence usually requires a thermodynamic advantage, namely, higher stability of product substrate. It has thus led rather limited examples success. Herein, we report photoredox catalytic hydrogen transfer (HAT) and enantioselective protonation strategy for challenging asymmetric isomerization. As...

Abstract Metal–organic framework (MOF) membranes with apparent molecular sieving effects have great potential for gas separation. However, their application in light‐gas separation (e.g., CO 2 /CH 4 and H ) remains challenging due to enlarged pore structures under transmembrane pressure. In this work, a series of MOF constructed from dual‐wing (DW) ligands including 2‐chloromethylbenzimidazole, 2‐methylbenzimidazole, 2‐ethylbenzimidazole, 2‐phenylbenzimidazole are reported, finely tune...

The promotion effect of Au in the catalyst PdAu/C for formic acid oxidation is confirmed. As ratio Pd:Au 3:1, PdAu/C-3 has largest electrochemical activity compared with that catalysts other ratios Pd:Au. Tafel plots are employed to examine charge-transfer kinetics electrooxidation. results suggest reaction faster on than Pd/C. kinetic parameters such as charge transfer parameter and diffusion coefficient electrooxidation electrocatalysts obtained under quasi-steady-state conditions....

Abstract A multifunctional chiral phosphine‐catalyzed enantioselective [3+2] annulation of Morita–Baylis–Hillman carbonates with barbiturate‐derived alkenes has been achieved under mild conditions, providing a variety spirobarbiturate‐cyclopentenes in moderate to excellent yields diastereo‐ and enantioselectivities. magnified image

A chiral bicyclic guanidine-catalyzed enantioselective sulfenylation of 3-substituted oxindoles to N-(sulfanyl)succinimides has been developed. series unprecedented 3-sulfenylated oxindoles, such as 3-benzyl/alkyl-substituted 3-benzyl/alkyloxindoles, were obtained with high enantioselectivities (up 98% ee). This methodology is also effective for the first asymmetric benzofuran-2(3H)-ones, providing 3-benzyl-3-benzylthio-substituted benzofuran-2(3H)-ones satisfactory results 95%

The phosphine-catalyzed [3 + 2] annulation reaction of ynones and barbiturate-derived alkenes has been developed with the assistance a weak acid, giving functionalized spirobarbiturate-cyclopentanones.

Abstract A phosphane‐catalyzed [3+3] annulation of azomethine imines with ynones has been developed. Under mild reaction conditions, the proceeds smoothly to afford tricyclic dinitrogen‐fused heterocyclic compounds in moderate excellent yields stereoselectivies. Using a chiral phosphine as catalyst, could work give cycloadduct yield enantioselectivity. magnified image

Abstract Mesoscale self‐assembly of particles into supercrystals is important for the design functional materials such as photonic and plasmonic crystals. However, while much progress has been made in self‐assembling adopting diverse lattices using different types particles, controlling their growth orientation on surfaces received limited success. Most latter control achieved via templating methods which lithographic processes are used to form a patterned surface that acts template particle...

The separation of C2H4 and C2H6 is a critical yet energy-intensive operation in the petrochemical industry. Gas membranes offer energy-efficient alternatives, but their effectiveness hindered by similar physical properties C2H6. Here, metallic nanocomposite membrane (MNM) comprising ultra-small Ag nanoparticles embedded an amidoxime-modified polymer intrinsic microporosity (AOPIM-1) reported for highly efficient C2H4/C2H6 separation. microporous structure AOPIM-1, combined with anchoring...

An asymmetric arylation of benzofuran-2(3<italic>H</italic>)-ones with 1-naphthols has been developed through a cooperative visible light photocatalysis hydrogen-bond catalysis.

A novel interpenetrating structural ultrafine polypropylene-silica nanocomposite particles were synthesized by a modified sol–gel approach in the presence of melt polypropylene emulsion. series samples with different content was prepared to investigate unique characteristics this original nanocomposite. The thermal gravimetric analysis and differential scanning calorimetry results showed that nanocomposites had structure good stability, crystallization behavior confined silica matrix. also...

Abstract With the use of a bifunctional chiral phosphine as catalyst, asymmetric [3+2] annulation Morita–Baylis–Hillman carbonates with cyclic 1‐azadienes proceeded smoothly under mild conditions to give various enantiomerically enriched cyclopentene derivatives bearing three consecutive tertiary stereocenters and sulfamate moiety in moderate excellent yields enantioselectivities diastereoselectivities. magnified image

Control of the assembly colloidal particles into discrete or higher-dimensional architectures is important for design myriad materials, including plasmonic sensing systems and photonic crystals. Here, we report a new approach that uses polyhedral shape metal–organic-framework (MOF) to direct clusters. This based on controlling attachment single spherical polystyrene particle each face via fusion synthesis, so defines final coordination number, which equal number faces, geometry assembled...

A protocol was described for obtaining a variety of substituted thiophenes with functional potential via metal-free dehydration and sulfur cyclization alkynols elemental (S8) or EtOCS2K in moderate-to-good yields. The method provides the base-free generation trisulfur radical anion (S3•–) its addition to alkynes as an initiator. This research broadens applications S3•– synthesis sulfur-containing heterocycles.

The asymmetric hydrogenation of silylimines was first developed by using a palladium complex P-stereogenic diphosphine ligand as the catalyst, affording valuable chiral α-aminosilanes with quantitative conversions and excellent enantioselectivities (up to 99% ee).

Lewis acid and substituent dependency on the regioselectivity of hydrosilylation propiolate esters 1a-c with tris(trimethylsilyl)silane (2a) was found. The reaction methyl ethyl 2a without in presence EtAlCl2 Et2AlCl gave beta-silicon-substituted Z-alkenes 3 selectively. On other hand, AlCl3 dichloromethane alpha-silicon-substituted alkenes 4. In case trifluoroethyl ester 1c, aluminum chloride-based acids 4 exclusively. Two competitive mechanisms, free-radical ionic, are proposed as source...

[4 + 3] cycloaddition of phthalazinium dicyanomethanides with in situ formed azoalkenes was achieved, providing an access to various 1,2,4-triazepine derivatives moderate excellent yields.