The cover image by Qing-Yi Huang shows highly sensitive detection of NH3 in the concentration of 0.6~2.0 ppm, which can be used as a gas-sensing material to detect kidney or hepatic disease from human breath. DOI: 10.1002/app.55209
The cover designed by Kelly Walker shows the use of maleic anhydride (MAH) interfacial grafting improves the compatibility of 3D printed dual material specimens containing high-density polyethylene (HDPE) and acrylonitrile-butadiene-styrene (ABS). Using a custom-made die affording the core-shell structure, the ABS-g-MAH is shown to improve the impact resistance by 253% and 16% compared to neat HDPE and ABS specimens, respectively. Additionally, a 10% increase compared to the unmodified ABS-HDPE core-shell configuration is observed. DOI: 10.1002/app.55301
The cover image, by Qi Chen et al., is based on the Research Article A novel photocatalytic membrane decorated with RGO‐Ag‐TiO2 for dye degradation and oil‐water emulsion separation, DOI: 10.1002/jctb.5426 .
Created by Shuting Liang, the cover image shows electricity-generating insoles that are composed of silicone holes filled with liquid metal. The movement of the human foot generates electricity. With a friction area of 18.75 cm2, a maximum output voltage of 221 mV is obtained. LM-TENG could be used in various fields to convert human mechanical energy into electricity and continue to provide clean energy for wearable electronic devices. DOI: 10.1002/app.55092
The first highly enantioselective intramolecular N−H bond insertion was realized by using copper catalysts modified with chiral spirobisoxazoline ligands, which provides a novel strategy for the synthesis of chiral 2‐carboxytetrahydroquinolines. This reaction features fast reaction rate, high yield, high enantioselectivity, and mild reaction conditions.
The first copper(I)‐catalyzed asymmetric 1,3‐dipolar [3+4] cycloaddition of nitrones with azoalkenes has been developed, affording a variety of biologically important 1,2,4,5‐oxatriazepane derivatives in good yields with exclusive regioselectivities and excellent enantioselectivities.
The cover image, by Dirk W Schubert et al., is based on the Research Article Compressive and cyclic loading of silicone breast implants and their effect on shape resilience and reliability of the shell material, DOI: 10.1002/pi.5516 .
A cobalt‐catalyzed regioselective C‐3 alkylation of coumarins was realized under mild reaction conditions, during which a variety of substituted coumarins including those containing sensitive functional groups could smoothly undergo the selective C(sp2)−C(sp3) bond formation with a series of cyclic or straight‐chain alkyl ethers.
The cover image, by Jianfeng Li et al., is based on the Research Article Synthesis and optimization of a novel poly‐silicic metal coagulant from coal gangue for tertiary‐treatment of coking wastewater, DOI: 10.1002/jctb.5362 .
A tunable and practical synthesis of electrophilic sulfenylating reagents, thiosulfonates and disulfides, from inexpensive and easily available sulfonyl chlorides, has been developed. By appropriate choice of solvents, the reaction of sulfonyl chlorides and tetrabutylammonium iodide gave the target products in good to excellent yields, respectively. These transformations probably proceed through a reducing–coupling pathway.
The cover image, by Estefanía Sierra et al., is based on the Research Article Chemoenzymatic synthesis of poly(phenylene disulfides) with insulating properties and resistant to high temperatures, DOI: 10.1002/jctb.5290 .
The cover image, by Ela Eroglu and Colin L Raston, is based on the Mini‐review Nanomaterial processing strategies in functional hybrid materials for wastewater treatment using algal biomass, DOI: 10.1002/jctb.5188 .
The cover image, by Aloisius R Purnama et al., is based on the Research Article Coarse‐grained models for frontal photopolymerization with evolving conversion profile, DOI: 10.1002/pi.5344 .
Cobalt‐catalyzed C−H amination of arenes with alkylamines by the assistance of 8‐aminoquinoline as auxiliary through sp2 C−H bond functionalization has been achieved. Attractive features of this protocol include the low loading of the cobalt catalyst and the readily available reagents.
A catalyst‐controlled regiodivergent dehydrogenative Heck reaction of 4‐arylthiophene/furan‐3‐carboxylates has been realized. Use of a palladium catalyst led to the C‐5 alkenylation through electronic palladation, while a ruthenium catalyst favored the C‐2 alkenylation with the assistance of a directing group. This reaction exhibited good to excellent regioselectivities.
A simple strategy to fabricate bifunctional antibacterial coatings via in situ synthesis and incorporation of silver nanoparticles (AgNPs) into quaternized poly(2‐(dimethylamino)ethyl methacrylate) (qPDMAEMA) brushes without using any reducing agents is reported. PDMAEMA brushes are prepared on Si wafer substrates via surface‐initiated reverse atom transfer radical polymerization, which then are quaternized with ethyl bromide and hexyl bromide, respectively. The resulting qPDMAEMA‐AgNP nanocomposite coatings are characterized by using Fourier‐transform infrared spectroscopy (FT‐IR), X‐ray photoelectron spectroscopy (XPS), field emission scanning electron microscope (FE‐SEM), and Raman spectroscopy. FE‐SEM and Raman results indicate that the AgNPs with an average diameter of 35 nm are successfully loaded into the qPDMAEMA brushes. Furthermore, the antibacterial activities of the qPDMAEMA‐AgNP nanocomposite coatings against Gram‐positive Staphylococcus aureus and Gram‐negative Escherichia coli are investigated by both disc diffusion and colony‐forming unit methods. The results show excellent antibacterial properties of the nanocomposite coatings. The influence of the length of the quaternization agents on their antibacterial properties is also investigated.
By the design of suitable starting materials, a silver(I)‐catalyzed epoxide ring‐opening/1,2‐acyl migration/cyclization cascade has been developed, which allowed us to systematically prepare unsymmetrical 3‐formylfurans. Various 3‐formylfurans were prepared in good to excellent yields. In addition, the distinct fluorescence properties of 3‐formylfurans in solution and the solid state are disclosed.
