Article
Chemistry, Multidisciplinary
Kaier Wu, Yuye Bai, Dewei Chen, Lu Chen, Yubing Huang, Shuli Bai, Yibiao Li
Summary: Heterocyclic compounds are widely found in nature and drug molecules, with many nitrogen-containing heterocyclic compounds exhibiting unique activity. 1,4-dihydropyridines, for example, have good antitumor and antibacterial effects and can be used as calcium channel blockers in the treatment of cardiovascular diseases. This study successfully designed cobalt carbon nanotubes as a catalyst for the efficient synthesis of 1,4-dihydropyridines under mild conditions, with advantages including high yields, low catalyst loading, short reaction time, and recyclability.
ENVIRONMENTAL CHEMISTRY LETTERS
(2021)
Article
Polymer Science
Benjamin Zanghellini, Patrick Knaack, Sebastian Schoerpf, Karl-Heinz Semlitsch, Helga C. Lichtenegger, Bernhard Praher, Maria Omastova, Harald Rennhofer
Summary: The dispersion of carbon nanotubes and carbon nanofibers is a crucial step in the production of polymer-based nanocomposites, and it is a challenge due to the tendency of nanofillers to agglomerate. While the three-roll mill is an effective method for dispersion, it is time-consuming and limits industrial applications. The study aimed to establish an efficient ultrasonic dispersion process and compare it with the three-roll mill method, using rheological tests and image analysis to characterize dispersion quality and improve the process.
Article
Chemistry, Organic
Xuebo Gao, Rong Chang, Junxin Rao, Danyang Hao, Zhuxia Zhang, Cong-Ying Zhou, Zhen Guo
Summary: Here, we report a halogen-bonding-based electron donor-acceptor (EDA) complex-promoted photoreaction for the synthesis of C2-malonylated indoles. The protocol allows for the efficient coupling of indoles with diethyl bromomalonate under visible-light irradiation without the need for any transition-metal catalyst or photocatalyst.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Quan-Qing Zhao, Julia Rehbein, Oliver Reiser
Summary: This study presents a visible-light-driven dearomatization reaction of unactivated arenes, enabling efficient synthesis of spiro-1,4-cyclohexadienes. Calculations indicate that the overall process is thermoneutral, highlighting the potential of light-driven processes in developing sustainable transformations that defy thermodynamic requirements.
Article
Chemistry, Multidisciplinary
Santosh T. Shinde, Kaluram G. Kanade, Ramesh B. Gawade, Vikram B. Hinge, Manish D. Shinde, Digambar B. Bankar, Nitin M. Thorat, Dinesh P. Amalnerkar
Summary: AlCl3-loaded ZnO nanoparticles were used as an efficient catalyst for 1,4-dihydropyridine synthesis under ambient temperature and solvent-free conditions. The nanoparticles were synthesized by precipitation and the catalyst was prepared by loading AlCl3 on ZnO nanoparticles. The catalyst showed high efficiency with a 92% yield for the synthesis of 1,4-dihydropyridine.
Article
Chemistry, Applied
Endarto Yudo Wardhono, Mekro Permana Pinem, Indar Kustiningsih, Mohammad Effendy, Daniele Clausse, Khashayar Saleh, Erwann Guenin
Summary: Low-frequency ultrasonic irradiation is employed as a cost-effective technique for the deacetylation of chitin, resulting in a high deacetylation degree of chitosan with similar characteristics to commercial chitosan. The power-law model is shown to be an effective way to describe this complex reaction process.
CARBOHYDRATE POLYMERS
(2021)
Article
Chemistry, Physical
Lorenzo Lisuzzo, Marco Bertini, Giuseppe Lazzara, Chiara Ferlito, Francesco Ferrante, Dario Duca
Summary: This work investigated the effect of alkali activation of halloysite nanotubes on its grafting efficiency with organosilanes. Computational analysis and experimental evidences showed that the pretreatment with a base is crucial for surface modification, leading to thermodynamically favorable exothermic reactions.
APPLIED CLAY SCIENCE
(2023)
Article
Chemistry, Organic
Xiaoping Chen, Xiaosheng Luo, Kaiqian Wang, Feng Liang, Ping Wang
Summary: The study introduces an efficient visible-light-promoted C-H alkylation method for nitrogen-containing heteroarenes using C4-alkyl DHPs as radical precursors at ambient temperature. A broad scope of heteroarenes can be successfully alkylated in good yields by utilizing various C4-alkyl DHPs.
Article
Chemistry, Multidisciplinary
Minh-Huy Dinh Dang, Linh Ho Thuy Nguyen, Trang Thi Thu Nguyen, Ngoc Xuan Dat Mai, Phuong Hoang Tran, Tan Le Hoang Doan
Summary: Sulfate-functionalized Hf-based metal-organic frameworks show high catalytic activity and reusability in heterogeneous catalysis applications. They possess a high-porosity framework and high active sites of functionalized clusters, enabling efficient catalysis of substrates under mild, solvent-free conditions.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Chemistry, Organic
Behrooz Maleki, Hengameh Atharifar, Oliver Reiser, Reihaneh Sabbaghzadeh
Summary: The Fe3O4-supported glutathione catalyst showed excellent catalytic activity in synthesizing 1,4-dihydropyridine derivatives, with easy separation and consecutive reuse in six runs. Other advantages include short reaction time, high yield, simple work-up procedure, easy catalyst handling, and high catalyst stability, making the protocol economical and sustainable.
POLYCYCLIC AROMATIC COMPOUNDS
(2021)
Review
Chemistry, Multidisciplinary
Majid M. Heravi, Vahideh Zadsirjan
Summary: The Hantzsch reaction is a well-known multi-component reaction for synthesizing 1,4-dihydropyridines, and microwave irradiation has been successfully utilized as a green energy source to promote this organic transformation. Literature survey shows that construction and aromatization of 1,4-DHPs can be effectively carried out under microwave irradiation in solution or dry media.
Article
Chemistry, Physical
Yiqi Ren, Maodi Wang, Qihua Yang, Junfa Zhu
Summary: The development of chiral solid catalysts using unconventional strategies is crucial for efficient heterogeneous asymmetric catalysis. The study presents a chiral solid catalyst, chiral diamine modified Ni/SiO2, for asymmetric Michael addition. The experimental results demonstrate that the peripheral Ni sites in close contact with SiO2 support are likely to be the active sites.
Article
Materials Science, Multidisciplinary
Selene Acosta, Ayrton Sierra-Castillo, Jean-Francois Colomer, Rony Snyders, Mildred Quintana, Chris Ewels, Carla Bittencourt
Summary: This study successfully grafted oxygen functional groups on the surface of vertically aligned multiwalled carbon nanotubes by low kinetic energy oxygen ion irradiation and thermal treatment, and demonstrated that this method is effective in controlling both the oxygen content of the sample and the ratio of different oxygenated functional groups simultaneously.
Article
Chemistry, Multidisciplinary
Mingshi Pan, Yixin Tong, Xiaodong Qiu, Xiaobao Zeng, Biao Xiong
Summary: A method for accessing 3-trifluoromethyl-1,4-benzoxazines from CF3-imidoyl sulfoxonium ylides and 2-bromophenols has been demonstrated. This method proceeds through a one-pot two-step sequence involving O-H insertion and annulation, and offers the advantages of a broad substrate scope, excellent functional tolerance, and simplicity of operation.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Applied
Challa Madhavi, Himavathi Ganja, Nagaraju Kerru, Suresh Maddila, Sreekantha B. Jonnalagadda
Summary: The study demonstrated the synthesis of composite materials with varying titanium dioxide loading on hydroxyapatite and characterized their structural properties and morphologies through a variety of analyses. The as-prepared composite materials showed efficient catalytic activity in synthesizing novel compounds with impressive yields at room temperature.
APPLIED ORGANOMETALLIC CHEMISTRY
(2021)
