Review
Chemistry, Multidisciplinary
Yair Cohen, Ilan Marek
Summary: The chemistry of cyclo-propane derivatives offers diverse challenges and interests researchers in theoretical, synthetic, and structural chemistry. Understanding the unique properties and novel synthesis methods of these small rings is crucial for the field, with a focus on the stereoselective synthesis of polysubstituted cyclopropanes.
ACCOUNTS OF CHEMICAL RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Feriel Rekhroukh, Linxing Zhang, Richard Y. Kong, Andrew J. P. White, Mark R. Crimmin
Summary: This study reports the reactions of cyclopropenes with compounds containing Mg-Mg bonds, demonstrating a concerted and stereoselective mechanism of 1,2-dimagnesiation. The findings shed new light on the stereochemistry of reactions involving magnesium reagents.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Organic
Ye Lim Kim, Sun-a Park, Seoung-Mi Choi, Jong-Un Park, Ju Hyun Kim
Summary: A cobalt-catalyzed strategy involving cyclopropenes as versatile alkenylating and allylating reagents was reported for C-H alkenylation and C-H allylation of arenes. The process leads to the synthesis of a wide range of alkenylated (hetero)arenes with complete (E)-stereoselectivity, as well as allylated (hetero)arenes with high stereoselectivity. The method involves sequential C-H and C-C bond cleavage, showcasing potential for efficient and selective synthesis.
Article
Chemistry, Organic
He Meng, Shiming Bai, Yu Qiao, Ting He, Weiyi Li, Jialin Ming
Summary: A three-component reaction of alkynes, arylzinc chlorides, and iodomethanes in the presence of a rhodium catalyst was discovered, which achieves high yields of trisubstituted/ tetrasubstituted alkenes. Traditional arylzinc chlorides only produced trisubstituted alkenes through migratory carbozincation-cross-coupling sequence involving 1,4-Rh migration. In contrast, 5-membered heteroarylzinc chlorides exclusively gave tetrasubstituted alkenes via a carborhodation-cross-coupling pathway without 1,4-migration.
Article
Materials Science, Multidisciplinary
T. Nakata, C. Xu, R. Abe, L. Geng, S. Kamado
Summary: The reheating at high temperature was used to control the textural features in a rolled Mg-Zn-Ca-Mn alloy sheet. Reheating at 450 degrees C caused grain coarsening, leading to the formation of double twinning and shear bands during rolling. Unexpectedly, the basal texture became strong due to the non-uniformly distributed dislocations. On the other hand, reheating at 350 degrees C resulted in uniform deformation-microstructure and apparent texture weakening during post-annealing.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Multidisciplinary
Kuiliang Li, Xiang Sun, Shuangshuang Zhao, Tong Li, Zhenggen Zha, Zhiyong Wang
Summary: This study developed an asymmetric allylation and allenylation method using easily manageable organoboron reagents under the catalysis of a Lewis acid. The method allows for the efficient synthesis of optically pure 3-allyl-3-hydroxyoxindoles and 3-allenyl-3-hydroxyoxindoles with high yields (up to 99%) and enantioselectivities (up to 97% ee). DFT calculations and proposed mechanisms provide support for the possible transition states. Gram-scale experiments and further functionalization of these chiral 3-hydroxyoxindoles have been established.
CHEMICAL COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Yu-Jun Feng, Qian Li, Tian-Liang Zhao, Fu-Sheng Pan
Summary: As-solutionized Mg-Sm-Zn-Zr alloy, benefiting from a quasi-passivated film, exhibits extraordinary corrosion resistance. The film consists of an outer layer, an intermediate layer, and a Zn-rich layer, and the oxide of solute element Sm strengthens the intermediate layer to impede corrosion.
Article
Metallurgy & Metallurgical Engineering
Di Tie, Renguo Guan, Huinan Liu, Minfang Chen, Sviatlana A. Ulasevich, Ekaterina V. Skorb, Patricia Holt-Torres, Xiaopeng Lu, Norbert Hort
Summary: The study presented a semisolid rheo-formed Mg-Zn-Sr alloy ureteral implant with suitable degradability and biocompatibility, which was clinically safe and demonstrated evident antibacterial activity in a pig model. The refined non-dendritic microstructure of the alloy and homogeneous degradation process resulted in a higher ultimate tensile strength. The research findings indicate that the Mg-Zn-Sr alloy is a promising option for ureteral implant materials, showing significant efficacy in clinical settings.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Metallurgy & Metallurgical Engineering
Di Tie, Renguo Guan, Huinan Liu, Minfang Chen, Sviatlana A. Ulasevich, Ekaterina V. Skorb, Patricia Holt-Torres, Xiaopeng Lu, Norbert Hort
Summary: The introduction of biodegradable implant materials has greatly improved the postoperative experience of patients in recent decades. In this study, a Mg-Zn-Sr alloy ureteral implant with suitable degradability and biocompatibility was tested in a pig model. The results showed that the alloy had higher tensile strength and antibacterial activity, and did not cause inflammation or pathological changes during the implantation process.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Materials Science, Multidisciplinary
Jinghua Zhao, Chengfa Ding, Guangxin Wu, Jieyu Zhang
Summary: This paper proposes a strategy to reduce the susceptibility of liquid metal embrittlement (LME) on advanced high strength steels by increasing the thickness of the inhibition layer and retarding the interdiffusion of Fe and Zn through adjusting the Al content in the coating. The study investigates the phase transformation and interdiffusion behavior of the coated steel and reveals that the presence of Sn element improves the stability of the inhibition layer and reduces the penetration of liquid Zn into the steel, thus controlling the LME phenomenon.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Zhiping Wang, Mingliang Wang, Yugang Li, Hongyu Xiao, Han Chen, Jiwei Geng, Xianfeng Li, Dong Chen, Haowei Wang
Summary: The study introduces a new approach of pretreatment before hot-working Aluminum alloys fabricated by spray forming, which enhances the microstructural stability and mechanical properties significantly by introducing Al3Zr particles and optimizing precipitates.
MATERIALS & DESIGN
(2021)
Article
Nanoscience & Nanotechnology
Kaiyun Xiang, Xiuchuan Lei, Lipeng Ding, Zhihong Jia, Xiaofang Yang, Qing Liu
Summary: The effect of homogenization and warm-rolling on the mechanical properties of an Al-based alloy fabricated by spray forming technology was studied. The results showed that the combination of these two processes significantly improved the mechanical properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Yubo Yang, Yu Fu, Guangxin Wu, Hongliang Liu, Yu Chen, Qun Luo, Qian Li
Summary: This study designed a eutectic Zn-Al-Mg coating alloy to improve the uniformity of the coating and inhibit the reaction. The results showed that the Zn-4.5Al-3.0Mg coating exhibited the highest resistance to liquid metal embrittlement at 920 degrees C. Additionally, the composition and processing temperature also affected the uniformity of the microstructure of the coated steels.
Article
Chemistry, Physical
Zhengping Lu, Yunze Jiang, Lihua Yu, Junhua Xu, Jingdun Peng, Kaiyun Xiang
Summary: Both Sc-added and Sc-free Al-Zn-Mg-Cu aluminum alloys were prepared by spray forming and their microstructure evolution and mechanical properties were studied. Scandium addition enhanced the effects of grain strengthening, dislocation strengthening, and precipitation strengthening. At different aging temperatures, the presence of scandium affected the precipitation of MgZn2 phase and significantly influenced the yield strength of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Manufacturing
Zhanyong Zhao, Jianbin Wang, Wenbo Du, Peikang Bai, Liqing Wang, Zhen Zhang, Zhiquan Huang
Summary: The hot deformation behavior of Mg-Gd-Y-Zn-Zr alloy formed by CMT arc additive was studied through hot compression tests, and it was found that twinning and dislocations occurred during the deformation process, leading to grain deformation and stress concentration.
VIRTUAL AND PHYSICAL PROTOTYPING
(2023)
