The direct functionalization of CH bonds is an attractive strategy in organic synthesis. Although several advances have been made in this area, the selective activation of inert sp3 CH bonds ...remains a daunting challenge. Recently, a new type of sp3 CH activation mode through internal hydride transfer has demonstrated the potential to activate remote sp3 CH linkages in an atom‐economic manner. This Minireview attempts to classify recent advances in this area including the transition to non‐activated sp3 CH bonds and asymmetric hydride transfers.
Do it the redox‐neutral way: A hydride transfer process can occur between an sp3 CH bond and a suitably located internal oxidative functional group, leading to a putative zwitterionic intermediate. This intermediate may then undergo cyclization or suffer capture by an external nucleophile, providing CH functionalization products (see scheme). The synthetic value and state‐of‐the‐art of these recently rediscovered strategies is exposed and discussed in this Minireview.
In recent times, the role of the regional economy changed significantly under certain conditions of globalization and structural adjustment. The process of changing must be crucial to analyse ...regional economy and develop the planning of regional economy. Developing economies depend often on industries and country policies. Modern studies tend to participate in important factors in this field such as energy intensity, labour skills, local industries, resources, and local expertise. Furthermore, in this study, to start developing the regional economy and make the revolution in this field to connect it with new technology, we train the deep learning algorithm of gathering factors to manage them perfectly and make a good prediction for the future economy. Hybrid sequence to sequence (seq2seq) algorithms of deep learning fed with previous information from past years and run the system to compare the predicted result data with current information to evaluate the method to be certified for the coming years.
This study delves into the digital preservation of Meishan folk woodcarvings, emphasizing the use of virtual reality (VR) technology to enhance the transmission of this traditional art. Utilizing 3D ...modeling and VR platforms, the research scans and rebuilds wooden carvings for digital exhibition. The realism and interactivity of the virtual environment are improved through collision detection algorithms such as Orientation Bracketing Box (OBB) and Axial Bracketing Box (AABB), complemented by high-precision 3D models created with LIDAR scanning technology. Findings indicate that the VR system significantly enhances the efficiency and quality of digital preservation, offering a robust solution for safeguarding Meishan folk woodcarvings.
Tantou woodblock prints are traditional Chinese woodblock prints with a long history. Adding modern information technology elements to the excellent traditional culture can better combine regional ...contemporary woodblock prints and realize the cultural heritage. In this paper, from the perspective of modern informatization inheritance, we propose a way of displaying Tantou woodblock prints with AR enhancement technology, which breaks the limitation of physical experience with the help of virtual technology and improves the immersive experience of Tantou woodblock prints by combining with visual SLAM spatial localization technology. Based on the KANO model, the inheritance effect of Tantou woodblock prints was empirically analyzed. The data of Q, A, I, R, M, and O of the satisfaction results of the experience effect of Tantou woodblock prints were 1.132, 3.034, 2.828, 1.422, 1.237, and 0.978, which belonged to the excitatory type of demand. The inheritance satisfaction could be improved by enhancing the natural experience effect. The percentage of experiencers’ satisfaction with the information acquisition rate of Tantou Wooden Plank New Year’s Paintings that reaches excellent and above is 82.35%, and this paper effectively captures the user’s experience point in the visual, which contributes to the inheritance of Tantou Wooden Plank New Year’s Paintings.
Smart textiles exhibiting optical response to external temperature stimuli are promising functional materials for a wide range of applications. It is critical yet challenging to endow these materials ...with high‐contrast, vivid, and real‐time optical signals, such as changes in color or fluorescent emission, for the indication of heating and/or cooling. A thermoresponsive dye system featuring simultaneous thermochromism and thermofluorescence is developed and applied to dyeing of polyester fabrics. The dye system is constructed by encapsulating a solution of indenoquinacridone (IQA) in aliphatic alcohol into SiO2 nanoparticles. The dual‐output response relies on the mechanism of solvent‐modulated dissociation/aggregation of the IQA molecules. Upon heating, the dye system and the dyed fabric exhibit clear color change and high‐contrast, turned‐on fluorescence, in a real time and highly reversible manner. The thermoresponsive temperature can be tailored by varying the aliphatic alcohol solvent with different melting point. The integration of high‐contrast dual optical outputs into this programmable, robust, and reversible dye system lays the foundation for its employment in a wide range of challenging applications in smart textiles.
Solvent‐modulated dissociation/aggregation of a quinacridone derivative leads to simultaneous thermochromism and thermofluorescence. After encapsulation into SiO2 nanoparticles, the system can be dyed into polyester fabrics. Upon heating, the dyed textiles exhibit clear color change and high‐contrast, turned‐on fluorescence, in a real‐time and highly reversible manner. The thermoresponsive temperature can be programmed by varying the solvent component of the system.
Li-rich Mn-based cathode materials are regarded as promising cathode materials for Li-ion batteries (LIBs) owing to their high electrochemical capacity and low cost. However, residual Li compounds on ...the surface and dissolution of metal ions cause severe degradation of the electrochemical performance, thereby hindering their practical applications. Li4V2Mn(PO4)4 is a composite cathode material with three-dimensional Li-ion diffusion channels and a stable structure at high operating voltages (>4.5 V). Herein, we modify the surface of LiLi0.2Mn0.54Ni0.13Co0.13O2 with Li4V2Mn(PO4)4. The Li4V2Mn(PO4)4 coating layer can not only reduce the content of residual Li compounds on the surface but also restrain the dissolution of transition metals. Theoretical calculations illustrate that Li4V2Mn(PO4)4 reduces the Li-ion diffusion energy barrier and provides efficient diffusion pathways. LiLi0.2Mn0.54Ni0.13Co0.13O2@Li4V2Mn(PO4)4 compounds deliver a discharge capacity of 300 mAh g−1 with a high initial coulombic efficiency (84.2%) and an excellent cycling stability (capacity retention of 78.1% after 200 cycles at 1C). Hence, the proposed modification strategy of phosphate-based materials could shed light on the structural design of surface-sensitive electrode materials for LIBs.
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•Li4V2Mn(PO4)4 reduces the Li ions diffusion energy barrier to facilitate Li ions transport.•Li4V2Mn(PO4)4 reduces the content of LiOH and Li2CO3 residues on the surface of LiLi0.2Mn0.54Ni0.13Co0.13O2.•Li4V2Mn(PO4)4 layer prevents the cathode material from HF attack and restrains transition metal dissolution during cycling.
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