A hierarchical glucose-intercalated NiMn-G-LDH@NiCo2S4 core-shell structure as a binder-free electrode for flexible all-solid-state asymmetric supercapacitors.

Flexible, lightweight, and high-energy-density asymmetric supercapacitors (ASCs) are highly attractive for portable and wearable electronics. However, the implementation of such flexible ASCs is still hampered by the low specific capacitance and sluggish reaction kinetics of the electrode materials. Herein, a hierarchical core-shell structure of hybrid glucose intercalated NiMn-LDH (NiMn-G-LDH)@NiCo2S4 hollow nanotubes is deliberately constructed on flexible carbon fiber cloth (CFC). The highly conductive hollow NiCo2S4 nanotube arrays can not only provide high-speed pathways for ion and electrolyte transfer but also regulate the growth of NiMn-G-LDH nanosheets. The expanded interlayer distance on NiMn-G-LDH nanosheets could further facilitate ion diffusion and improve the rate retention. Benefiting from the rational engineering, the flexible NiMn-G-LDH@NiCo2S4@CFC as a free-standing electrode could deliver a superior specific capacity of 1018 C g-1 at 1 A g-1, which is almost twice higher than that of pristine NiCo2S4@CFC. In addition, the as-assembled flexible all-solid-state ASC device (NiMn-G-LDH@NiCo2S4@CFC//AC) is capable of working at various bending angles and exhibits an impressive energy density of 60.3 W h kg-1 at a power density of 375 W kg-1, as well as a superior cycling stability of 86.4% after 10 000 cycles.

Photolysis of a bola-type supra-amphiphile promoted by water-soluble pillar[5]arene-induced assembly.

A bola-type supra-amphiphile assembled from a water-soluble pillar[5]arene host (WP5) and a rod-coil guest molecule (G) containing a photoactive 9,10-dialkoxyanthracene group was successfully constructed, which could further assemble into a monolayer supramolecular vesicle. Interestingly, the photodecomposition rate of G was remarkably promoted after its aggregation with WP5, accompanied by the disassembly of the formed supramolecular vesicle, especially with the coassembly of a photosensitizer eosin Y, which has potential applications in phototherapy.

Palladium-catalyzed stereoretentive olefination of unactivated C(sp3)-H bonds with vinyl iodides at room temperature: synthesis of ß-vinyl α-amino acids.

A method is reported for palladium-catalyzed N-quinolyl carboxamide-directed olefination of the unactivated C(sp(3))-H bonds of phthaloyl alanine with a broad range of vinyl iodides at room temperature. This reaction represents the first example of the stereoretentive installation of multisubstituted terminal and internal olefins onto unactivated C(sp(3))-H bonds. These methods enable access to a wide range of challenging ß-vinyl α-amino acid products in a streamlined and controllable fashion, beginning from simple precursors.

Iodination of remote ortho-C-H bonds of arenes via directed S(E)Ar: a streamlined synthesis of tetrahydroquinolines.

A new strategy for the synthesis of tetrahydroquinolines (THQs) via the sequential functionalizations of remote C-H bonds is reported. This method uses a single picolinamide directing/protecting group to effect Pd-catalyzed γ-C(sp(3))-H arylation, metal-free ε-C(sp(2))-H iodination, and Cu-catalyzed intramolecular C-N cross-coupling. The overall sequence is efficient and versatile, and offers a streamlined synthesis of THQs with complex substitution patterns from readily available aryl iodide and aliphatic amine precursors.

Improved protocol for indoline synthesis via palladium-catalyzed intramolecular C(sp2)-H amination.

An efficient method has been developed for the synthesis of indoline compounds from picolinamide (PA)-protected ß-arylethylamine substrates via palladium-catalyzed intramolecular amination of ortho-C(sp(2))-H bonds. These reactions feature high efficiency, low catalyst loadings, mild operating conditions, and the use of inexpensive reagents.

Highly efficient syntheses of azetidines, pyrrolidines, and indolines via palladium catalyzed intramolecular amination of C(sp3)-H and C(sp2)-H bonds at γ and δ positions.

Efficient methods have been developed to synthesize azetidine, pyrrolidine, and indoline compounds via palladium-catalyzed intramolecular amination of C-H bonds at the γ and δ positions of picolinamide (PA) protected amine substrates. These methods feature relatively a low catalyst loading, use of inexpensive reagents, and convenient operating conditions. Their selectivities are predictable. These methods highlight the use of unactivated C-H bond, especially the C(sp(3))-H bond of methyl groups, as functional groups in organic synthesis.