Article
Chemistry, Organic
Yan Jiang, Hao-Jie Ma, Xue-Long Wang, Yi Yang
Summary: A Yb(OTf)(3)-catalyzed formal (4 + 3) cycloaddition reaction was successfully achieved using donor-acceptor cyclopropanes and 3-benzylideneindoline-2-thiones as reactants. Functionalized 5,10-dihydro-2H-thiepino[2,3-b]indole derivatives were synthesized with good yields and moderate to good diastereoselectivity. This reaction represents the first (4 + 3) cycloaddition of 3-benzylideneindoline-2-thiones.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Organic
Yan Jiang, Hao-Jie Ma, Xue-Long Wang, Yi Yang
Summary: A new compound was synthesized successfully in this study by using Yb-(OTf)(3) catalyst to react donor-acceptor cyclopropanes with sulfur-containing 4π components. The reaction showed high yields and moderate to good diastereoselectivity.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Organic
Tao Wang, Wen-Bin Wang, Yan-Ming Fu, Cheng-Feng Zhu, Lan-Jun Cheng, Yang-En You, Xiang Wu, You-Gui Li
Summary: An asymmetric double oxidative [3 + 2] cycloaddition is reported, which generates highly functionalized chiral CF3-containing spiro[pyrrolidin-3,2'-oxindole] with four contiguous stereocenters stereoselectively. This method directly constructs two C-C bonds from four C(sp3)-H bonds, and it features mild conditions, broad substrate scope, and excellent functional group compatibility.
Article
Energy & Fuels
Yang Ren, Chengyang Cao, Hongyun Hu, Su Lei, Xiangzhou Yuan, Xian Li, Hong Yao
Summary: This study investigated the pyrolysis behavior of polychloroprene rubber (PCP) and found that the distribution of chlorine in gas and tar was influenced by the molecular chain cyclization. The conversion pathway from chlorinated limonene to chlorinated aromatic hydrocarbons was enhanced at higher temperatures and heating rates.
Review
Chemistry, Multidisciplinary
Jan Maier, Todd B. Marder
Summary: The mechanism of the hexadehydro-Diels-Alder reaction (HDDA) is not simply described by a concerted or stepwise mechanism, with terminal substituents affecting reaction mechanism and kinetics and linkers influencing the HDDA reaction. Studies on yne-diynes reveal the impact of steric, electronic, and radical-stabilizing effects, while the recently discovered photochemical HDDA reaction may not proceed by the same mechanism as thermally generated ortho-arynes.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Organic
Yu-Tao He, Li-Xuan Li, Xiaohong Lin, Bao-Long Hou, Chuang-Chuang Li
Summary: The rhodium-catalyzed bridged (3+2) cycloaddition cascade reactions of N-sulfonyl-1,2,3-triazoles described in this study efficiently allowed the construction of various functionalized bridged ring systems, including the highly strained polycyclic bicyclo[2.2.2]octa[b]indole core of fruticosine.
Article
Chemistry, Multidisciplinary
Masao Ohashi, Dan Tan, Jiayan Lu, Cooper S. Jamieson, Daiki Kanayama, Jiahai Zhou, K. N. Houk, Yi Tang
Summary: The synthesis of cis-decalin structures using [4 + 2] cycloaddition with high stereoselectivity is challenging. In this study, we investigated the biosynthetic pathway of the fungal natural product fischerin (1) and identified a novel pericyclase, FinI, which catalyzes this reaction. The cocrystal structure of FinI, a predicted O-methyltransferase, with the product and SAM provides valuable insights into the natural formation of cis-decalin.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Jie Ouyang, Rajat Maji, Markus Leutzsch, Benjamin Mitschke, Benjamin List
Summary: Here, we report the design of a highly enantioselective, catalytic (4 + 3) cycloaddition reaction enabled by strong and confined IDPi Lewis acids. This reaction allows the synthesis of novel compounds with multiple stereocenters from gem-dialkyl 2-indolylalcohols and dienolsilanes. The method exhibits broad substrate scope and versatile downstream chemical modifications. Density functional theory-supported mechanistic studies reveal the significance of the in-situ generated silylium species in an overall concerted yet asynchronous cycloaddition.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Organic
Julia O. Strelnikova, Alexander N. Koronatov, Nikolai Rostovskii, Alexander F. Khlebnikov, Olesya Khoroshilova, Mariya A. Kryukova, Mikhail S. Novikov
Summary: The domino reaction catalyzed by Rh-2(Piv)(4) leads to the formation of N-sulfonylated (Z)-2-(2-aminovinyl)imidazoles, providing a direct and flexible access to the desired compounds.
Article
Chemistry, Organic
Aleksandras Lotuzas, Anton El Khoury, Liubo Li, Patrick G. Harran
Summary: 4-Isocyanobut-1-ene reacted rapidly with acetyl bromide to form an unstable imidoyl bromide adduct. By subsequent in situ cyclization under Heck conditions, a stable prototropic isomer of 2-acetyl-3-methylpyrrole was obtained. The reactivity of this molecule towards acids, bases, and oxidants was investigated, and its conversion into an alpha-methylidene gamma-lactam was demonstrated. In its protonated form, the molecule functioned as a reactive dienophile in Diels-Alder reactions.
Article
Chemistry, Organic
Keita Komine, Satoshi Kishimoto, Hayato Fukuda, Jun Ishihara
Summary: An unexpected 4-exo cyclization reaction of rigid bicyclo[2.2.2]octene derivatives is described, which provides a highly condensed tricyclo[3.3.1.0(2,7)]nonane skeleton containing a cyclobutane.
TETRAHEDRON LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Nan-Nan Mo, Yu-Hang Miao, Xiao Xiao, Yuan-Zhao Hua, Min-Can Wang, Lihua Huang, Guang-Jian Mei
Summary: In this study, the chiral phosphoric acid-catalyzed asymmetric intermolecular formal [3+2] cycloaddition of azoalkenes with azlactones has been achieved, leading to the facile and highly enantioselective construction of a wide range of fully substituted 4-pyrrolin-2-ones with a fully substituted carbon atom in good yields and excellent enantioselectivities.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Organic
Nan-Fang Mo, Ying Zhang, Zheng-Hui Guan
Summary: An asymmetric organocatalyzed three-component Povarov reaction has been developed to construct azaspirocycles. A chiral phosphoric acid catalyst with a unique structure was highly efficient in the reaction, leading to a wide range of azaspirocycles in high yields and excellent enantioselectivities. This reaction has expanded the scope of the traditional Povarov reaction.
Article
Chemistry, Organic
Gary L. Points, Christopher M. Beaudry
Summary: Substituted carbazoles are efficiently synthesized from 3-triflato-2-pyrones and alkynyl anilines, allowing for multiple substituents with complete control of regiochemistry, resulting in complex substitution patterns. This strategy can also be applied to prepare substituted bicarbazoles and related biaryls, and has been demonstrated in the synthesis of the carbazole natural product clausine C.
Article
Chemistry, Physical
Tongyun Zhang, Chengping Zhang, Xiaoxun Ma, Hengdao Quan
Summary: A facile investigation was conducted to explore the gas-phase dehydrochlorination reaction of 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) over various halides supported active carbon (AC) catalysts. CsF was found to be the optimal active component, showing the best dehydrochlorination selectivity and conversion of HCFO-1233xf. However, CsF catalyst showed observable deactivation due to F/Cl exchange between HCFO-1233xf and the catalyst.
MOLECULAR CATALYSIS
(2023)
Article
Engineering, Civil
Sandeep Saharan, Neeraj Kumar, Seema Bawa
Summary: In-advance availability of parking information is crucial for making decisions about parking, managing congestion, and efficiently utilizing parking lots. This paper proposes a scheme based on machine learning and game theory for pricing and allocating parking slots in on-street parking scenarios. The scheme models the dynamic pricing and allocation problem as a Stackelberg game and utilizes a random forest model to predict occupancy and generate parking prices. The proposed scheme outperforms other state-of-the-art schemes in terms of performance evaluation metrics.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Guojun Liang, U. Kintak, Xin Ning, Prayag Tiwari, Slawomir Nowaczyk, Neeraj Kumar
Summary: In this paper, the authors propose a novel Semantics-aware Dynamic Graph Convolutional Network (SDGCN) for traffic flow forecasting, which adaptively builds dynamic Laplacian matrices by considering the trip pattern and motivation of traffic flows. Experimental results show that SDGCN outperforms existing traffic flow forecasting methods and provides better explanations of the generative Laplace matrices, making it suitable for traffic flow forecasting in large cities and providing insights into the causes of various phenomena such as traffic congestion.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Debbarni Sarkar, Satyendra Singh Yadav, Vipin Pal, Yogita, Neeraj Kumar
Summary: In this paper, an IRS aided downlink NOMA-HARQ based IoT framework is proposed to enhance the IoT devices' performance in non-line-of-sight (NLoS) region. Two NOMA-HARQ aided IRS schemes, namely NOMA-SC with IRS and NOMA-MRC with IRS, are proposed to enhance the performance of NLoS IoT devices/users. Simulation results demonstrate that these proposed schemes outperform conventional NOMA-HARQ in terms of achievable data rates, outage probability, bit error rate (BER), and diversity order.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2023)
Article
Computer Science, Information Systems
Zhiwei Guo, Keping Yu, Neeraj Kumar, Wei Wei, Shahid Mumtaz, Mohsen Guizani
Summary: With the rapid development of edge intelligence in wireless communication networks, mobile-edge networks (MENs) have been widely discussed in academia. The article proposes a deep distributed-learning-based POI recommendation (Deep-PR) method for MENs, which effectively considers both internal and latent external features of users. Experimental results on real-world data sets show that Deep-PR outperforms seven typical baselines in terms of overall performance.
IEEE INTERNET OF THINGS JOURNAL
(2023)
Article
Computer Science, Information Systems
Soni Chaurasia, Kamal Kumar, Neeraj Kumar
Summary: In Wireless Sensor Networks (WSNs), the proposed Meta-heuristic Optimized Cluster head selection-based Routing algorithm (MOCRAW) addresses the issues of energy consumption and network overhead by minimizing node's energy consumption and ensuring fast data transmission.
Article
Computer Science, Artificial Intelligence
Deepika Sirohi, Neeraj Kumar, Prashant Singh Rana, Sudeep Tanwar, Rahat Iqbal, Mohammad Hijjii
Summary: Machine learning and Deep learning models are widely used in various fields. Conventional centralized training techniques may not be suitable for distributed applications. Federated learning is a developing approach that allows collaboration and distributed training. However, distributed learning faces challenges such as data heterogeneity, scalability, and security threats. Therefore, a structured vulnerability and risk assessment is needed for successful deployment.
ARTIFICIAL INTELLIGENCE REVIEW
(2023)
Article
Engineering, Electrical & Electronic
Preksha Jain, Akhil Gupta, Neeraj Kumar, Mohsen Guizani
Summary: With the evolution of wireless systems, the number of wireless communication devices has grown exponentially. The development of technologies like IoT and mMTC has also contributed to this increase. The future of wireless communication networks in the 6G era will involve ultra-dense distribution of devices with various service and rate requirements, demanding high network energy, capacity, and efficient spectrum deployment. This paper proposes the use of mMIMO and NOMA techniques, as well as millimeter Wave and Terahertz channels, to enhance network capacity. Additionally, the paper suggests the use of BS caching and an application-specific channel selection scheme in a cache-enabled two-tier 6G HetNet.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Himanshu Sharma, Neeraj Kumar, Rajkumar Tekchandani
Summary: A federated deep reinforcement learning-based anti-jamming technique is proposed to address the security issues in 5G HetNets. By optimizing beamforming and power allocation, the proposed scheme improves the achievable rate for users. Simulation results show that the proposed federated DRL scheme outperforms other schemes in terms of achievable rate.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Manoj Kumar, Upasana Dohare, Sushil Kumar, Neeraj Kumar
Summary: Using microgrids to charge Electric Vehicles (EVs) is a significant step toward achieving Electric mobility. The microgrids generate electricity for self-use and sell surplus energy locally in a Peer-to-Peer (P2P) manner. However, the energy trading decision for microgrids is challenging due to uncertainties and the lack of information about other competitive microgrids.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Ikkurthi Bhanu Prasad, Yogita, Satyendra Singh Yadav, Neeraj Kumar, Vipin Pal
Summary: Clustering techniques, such as the proposed BAT protocol, using the Barabasi-Albert (BA) model and Topsis (T) technique, are effective in balancing the load and energy consumption among sensor nodes in wireless sensor networks. The BAT protocol ensures even energy consumption and avoids energy holes in the network, resulting in a better stable region and balanced energy-efficient consumption compared to other simulated protocols.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Civil
Gunasekaran Raja, Nisha Deborah Philips, Ramesh Krishnan Ramasamy, Kapal Dev, Neeraj Kumar
Summary: This paper proposes a method called DTG-GN for generating unmanned aerial vehicle (UAV) trajectories using an improved genetic algorithm and non-uniform rational P-splines optimization. The method aims to improve the efficiency of monitoring agricultural lands by optimizing the smoothness and accuracy of the trajectories. The improved genetic algorithm selects an optimal path, while the non-uniform rational P-splines optimization improves the smoothness of the trajectory. The 6G network is utilized to ensure seamless connectivity between the UAV and the ground control station. Experimental results demonstrate that DTG-GN reduces the time and trajectory length for generating optimal trajectories compared to conventional methods.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2023)
Article
Engineering, Civil
Ahmed Barnawi, Shubhani Aggarwal, Neeraj Kumar, Daniyal M. Alghazzawi, Bander Alzahrani, Mehrez Boulares
Summary: Vehicle-to-grid (V2G) technology is used for demand response management in eco-friendly environments to reduce carbon footprints. However, security and privacy issues arise due to information exchange via the open channel of the Internet in V2G environments. This paper proposes a blockchain-based solution for efficient energy trading between electric vehicles (EVs) and charging stations (CSs), with miner nodes and block verifiers selected based on power consumption and processing power. A game theory-based approach is also proposed for energy management and peak load control. Performance evaluations show superior results compared to existing solutions.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2023)
Article
Geochemistry & Geophysics
Leiquan Wang, Tongchuan Zhu, Neeraj Kumar, Zhongwei Li, Chunlei Wu, Peiying Zhang
Summary: With the development of deep neural networks, hyperspectral image (HSI) classification systems have achieved a significant improvement. To handle noisy labels in hyperspectral classification, an end-to-end attentive-adaptive network (AAN) is proposed for robust HSI classification training. The effectiveness of AAN on HSI classification is demonstrated through experimental results on three benchmark datasets.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Computer Science, Information Systems
Lianzhong Wang, Zhe Zheng, Ning Chen, Yingying Chi, Yong Liu, Hailong Zhu, Peiying Zhang, Neeraj Kumar
Summary: Smart Grid- Grid 2.0 is a promising grid scenario with low cost, high reliability, and high security. However, the complex task interaction and differentiated QoS requirements pose challenges to energy orchestration. This paper proposes an energy orchestration strategy based on Virtual Network Embedding (VNE) to better support the operation and maintenance of Grid 2.0.
Article
Engineering, Civil
Peiying Zhang, Ning Chen, Guanjun Xu, Neeraj Kumar, Ahmed Barnawi, Mohsen Guizani, Youxiang Duan, Keping Yu
Summary: With the maturity of 5G and ITS technologies, the limited lifetime and computing capability of mobile devices pose challenges to QoS. To address the efficiency and sustainability issues, this paper proposes a multi-target-aware dynamic resource scheduling algorithm and utilizes deep reinforcement learning to interact with the MTCN environment effectively.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2023)
Article
Chemistry, Organic
Geeta Devi Yadav, Pooja Chaudhary, Balaram Pani, Surendra Singh
Summary: Chiral transition metal complexes with privileged ligands are efficient catalysts for various asymmetric organic transformations. Transition metal complexes of C1-symmetric pyrrolidine-based ligands have been widely used in asymmetric organic reactions. However, a comprehensive review article on the transition metal complexes of chiral C1-symmetric pyrrolidine-based ligands derived from (L)-proline has not been published.
TETRAHEDRON LETTERS
(2024)
