Article
Chemistry, Organic
Kota Sugimoto, Io Mori, Takanari Kato, Koji Yasui, Ban Xu, Choon Hong Tan, Minami Odagi, Kazuo Nagasawa
Summary: In this study, a new method for intramolecular oxidative coupling reaction of oxindoles with beta-dicarbonyls using a guanidinium hypoiodite catalyst was reported. The reaction resulted in the formation of spiro-coupling products in moderate to excellent yields. Furthermore, a chiral hypoiodite catalyst derived from the chiral guanidinium organocatalyst was found to be effective for the challenging asymmetric carbon-carbon bond-forming reaction, leading to the synthesis of optically active spiro[indoline-3,4'piperidines].
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Engineering, Environmental
Himanshu Goyal, Sunitha Sadula, Dionisios G. Vlachos
Summary: This study investigates the impact of selective microwave heating on multiphase reactors, focusing on slurry reactors with solid particles dispersed in liquid. Through experiments, theory, and simulations, they propose an ideal reactor and analytical expressions to predict temperature evolution. The results show a strong influence of solid material and concentration on the heating rate of slurries.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Organic
Guo-Sheng Zhu, Pei-Jun Yang, Chen-Xue Ma, Gaosheng Yang, Zhuo Chai
Summary: In this study, Hantzsch esters (HEs) were used as two-carbon partners in a copper(I)-catalyzed enantioselective [3 + 2] annulation with racemic 2-(hetero)aryl-N-sulfonyl aziridines via kinetic resolution to provide pyrrolo[2,3-b]tetrahydropyridines containing multiple contiguous stereogenic centers. The reactions yielded products with excellent yields and enantiopurities, as well as moderate-to-excellent diastereoselectivities. Depending on the structures of the aziridines, a competitive hydrogenolysis process with HEs as the hydrogen source was also observed in some cases.
Review
Energy & Fuels
Hua Li, Jialiang Xu, Samuel Mbugua Nyambura, Jufei Wang, Chao Li, Xueru Zhu, Xuebin Feng, Yongjian Wang
Summary: This paper summarizes the heating mechanisms and effect factors of traditional and microwave heating pyrolysis in food waste treatment. It reviews the latest studies on biochar, bio-oil, and biogas produced from food waste pyrolysis using both traditional and microwave heating methods. The review focuses on the effects of heating methods on the products and yields of food waste pyrolysis, providing important insights for its application and further research. Techno-economic analysis and future implications for the development of food waste pyrolysis are also discussed.
Article
Thermodynamics
Alberto Schiraldi, Alberto Paoli
Summary: This study provides simple evidence of a peculiar microwave susceptibility of a water-ethanol mixture with the decamer (EtOH)9•H2O, which suggests a change in the hydrogen bond network and/or intermolecular hydrophobic hydration.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Chemistry, Organic
Hai-Tao Yang, Su-Qing Zhou, Dan-Mei Chen, Zi-Jun Hu, Xiao-Qi Qiang, Xiao-Qing Song, Sheng Tan, Wei-Hua Jiang, Yong-Qiang Sun, Chun-Bao Miao
Summary: A copper-catalyzed annulation of O-acyl oximes with cyclic 1,3-diones has been developed, providing a concise synthesis of 7,8-dihydroindolizin-5(6H)-ones and cyclohexanone-fused furans through substituent-controlled selective radical coupling. 2-Alkyl cyclic 1,3-diones undergo C-C radical coupling, while 2-unsubstituted cyclic 1,3-diones undergo C-O radical coupling.
Article
Chemistry, Organic
Shitao Sun, Jinle Hao, Maosheng Cheng, Yongxiang Liu, Bin Lin
Summary: Computational studies provide insight into the regioselectivity of gold(i)-catalyzed intramolecular cycloisomerizations of tryptamine-ynamides. The electrostatic effect is found to be the key factor for alpha-position selectivity, while the dispersion effect is the key factor for beta-position selectivity. These findings guide the understanding of other gold(i)-catalyzed asymmetric alkyne cyclization reactions.
ORGANIC & BIOMOLECULAR CHEMISTRY
(2023)
Article
Thermodynamics
Wenjian Lan, Hanxiang Wang, Qihu Liu, Xin Zhang, Jingkai Chen, Ziling Li, Kun Feng, Shengshan Chen
Summary: This paper presents a new microwave heating technology for coalbed methane (CBM) and designs optimized structure of microwave antenna for heating. Numerical simulations and experimental verification show that the technology can efficiently raise the temperature of coal reservoir and enhance the CBM production.
Article
Chemistry, Applied
Su Chen, Monica Oliva, Luc Van Meervelt, Erik V. Van der Eycken, Upendra K. Sharma
Summary: The study presents a palladium-catalyzed cascade reaction to construct difunctionalized acyl indoles, involving multiple bond formations in a single operational step. Enantioselectivity at a quaternary carbon center is attempted. Additionally, a continuous-flow process is demonstrated for the synthesis of aryl isocyanides within minutes and their telescopic use.
ADVANCED SYNTHESIS & CATALYSIS
(2021)
Article
Engineering, Aerospace
Sungwoo Lim, Sam Reeve, Eneko Lekuona, Alberto Garbayo, Thomas Le Toux, Andrew Morse, James Bowen, Mahesh Anand
Summary: The sustainable exploration of the Moon could benefit from microwave heating-based 3D Printing technology, with the development of an MHD payload concept to perform ISRU experiments and generate valuable scientific data. Design criteria include sustainable heating performance at low microwave power levels, and considerations for phenomena during microwave heating of lunar regolith for future mission applications.
ADVANCES IN SPACE RESEARCH
(2022)
Article
Green & Sustainable Science & Technology
Xiaoming Liu, Yu Zhao, Weizheng Liu, Daxiong Yan
Summary: This study investigates the effects of SiC-Fe3O4 content and thickness of a microwave enhanced functional layer (MEFL) on microwave heating efficiency (MHE) and ice-thawing time. Results show that higher SiC-Fe3O4 content in the MEFL improves MHE and reduces ice-thawing time. However, thicker MEFL decreases MHE and increases ice-thawing time. The microwave energy utilization efficiency of a 10 mm MEFL reaches 79.21%. Overall, the MEFL significantly improves MHE and deicing efficiency of asphalt concrete.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Astronomy & Astrophysics
Gregory D. Fleishman, Sergey A. Anfinogentov, Alexey G. Stupishin, Alexey A. Kuznetsov, Gelu M. Nita
Summary: The question of why the solar corona is hotter than the visible solar surface remains a puzzle for solar researchers. Most theories involve a tight coupling between the coronal magnetic field and thermal structure, with microwave gyroresonant emission being sensitive to both aspects. This sensitivity demonstrates the importance of understanding the details of coronal heating.
ASTROPHYSICAL JOURNAL
(2021)
Article
Engineering, Geological
Martina Pressacco, Jari J. J. Kangas, Timo Saksala
Summary: This study numerically evaluates the effects of microwave heating on the mechanical properties of hard rock, showing that microwave heating can significantly reduce the compressive and tensile strength of the rock.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Environmental
Eduardo Perez-Botella, Dries Peumans, Gerd Vandersteen, Gino Baron, Jose M. Catala-Civera, Jose Gutierrez-Cano, Guy Van Assche, Aleix Costa Cornella, Joeri F. M. Denayer
Summary: This study presents a comprehensive investigation of microwave heating applied to large structured activated carbon adsorbents. By modifying the geometry and impedance of the cavity and optimizing the size of the adsorbent bed and heating time, heating homogeneity and energy efficiency can be achieved.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Geological
Zhenlong Ge, Qiang Sun
Summary: In recent years, microwave mechanical rock breaking technology has been increasingly used to improve the efficiency of geothermal well drilling. Studies have shown that microwave heating increases the number of microcracks in gabbro, leading to more active acoustic emission. The combination of high heating power and low heating time is more conducive to rock failure and damage is more obvious with heating power exceeding 3.3 kW.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
