Results 1 to 10 of about 4,127 (128)

Transition-Metal-Free [3+2] Dehydration Cycloaddition of Donor-Acceptor Cyclopropanes With 2-Naphthols

Frontiers in Chemistry, 2021
A Brønsted acid-catalyzed domino ring-opening cyclization transformation of donor-acceptor (D-A) cyclopropanes and 2-naphthols has been developed.
Hua Zhao, Peng Shen, Dongru Sun, Hongbin Zhai, Yufen Zhao   +4 more
doaj   +1 more source

Photoinduced Atom Transfer Radical Addition/Cyclization Reaction between Alkynes or Alkenes with Unsaturated α-Halogenated Carbonyls

Molecules, 2021
We have developed a photochemical ATRA/ATRC reaction that is mediated by halogen bonding interactions. This reaction is caused by the reaction of malonic acid ester derivatives containing bromine or iodine with unsaturated compounds such as alkenes and ...
Kazuki Matsuo, Tadashi Yoshitake, Eiji Yamaguchi, Akichika Itoh   +3 more
doaj   +1 more source

Probing the Conductive and Tribological Behaviors of Solid Additives in Multiply Alkylated Cyclopentanes for Sliding Electrical Contact

Nanomaterials, 2022
Sliding electrical contacts need to be lubricated by conductive lubricants to perform low energy dissipation, high reliability, and long service life.
Zhengfeng Cao, Qiuyu Shi, Xiangyu Ge, Shuliang Liu, Bo Wei, Ting Wang   +5 more
doaj   +1 more source

Modular access to chiral cyclopentanes via formal [2+2+1] annulation enabled by palladium/chiral squaramide relay catalysis

Tetrahedron Chem, 2022
An enantio- and diastereodivergent [2+2+1] annulation reaction of allyl ketones, acidic methylene compounds, and nitroalkenes to assemble highly functionalized cyclopentanes from readily available substances enabled by asymmetric relay catalysis of ...
Lian-Feng Fan, Rui Liu, Pu-Sheng Wang, Liu-Zhu Gong   +3 more
doaj   +1 more source

Ionic Liquids as Performance Ingredients in Space Lubricants

Molecules, 2021
Low vapor pressure and several other outstanding properties make room-temperature ionic liquids attractive candidates as lubricants for machine elements in space applications.
Erik Nyberg, Christoph Schneidhofer, Lucia Pisarova, Nicole Dörr, Ichiro Minami   +4 more
doaj   +1 more source

Potent GH20 N-Acetyl-β-d-hexosaminidase Inhibitors: N-Substituted 3-acetamido-4-amino-5-hydroxymethyl-cyclopentanediols

Molecules, 2018
From 1,2;3,4-di-O-isopropylidene-d-galactopyranose, a preliminary series of highly functionalized amino(hydroxymethyl)cyclopentanes was easily available. These amine-containing basic carbasugars featuring the d-galacto configuration are potent inhibitors
Patrick Weber, Seyed A. Nasseri, Bettina M. Pabst, Ana Torvisco, Philipp Müller, Eduard Paschke, Marion Tschernutter, Werner Windischhofer, Stephen G. Withers, Tanja M. Wrodnigg, Arnold E. Stütz   +10 more
doaj   +1 more source

The preparation of several 1,2,3,4,5-functionalized cyclopentane derivatives

Beilstein Journal of Organic Chemistry, 2013
With the goal of eventually synthesizing [5]radialene (3), the still missing member of the parent radialene hydrocarbons, we have prepared the pentaacetates 21 and 31, the pentabromide 29 and the hexabromide 32.
André S. Kelch, Peter G. Jones, Ina Dix, Henning Hopf   +3 more
doaj   +1 more source

Highly enantio-stereoselective Ni-catalyzed reductive cyclization to cyclopentanes with chiral quaternary centres of trisubstituted allylic siloxanes

Green Synthesis and Catalysis
The construction of chiral quaternary carbon stereocenters is a significant challenge in asymmetric synthesis. Catalytic synthesis of these structures with trisubstituted allylic alcohols is highly important.
Wanjun Chen, Xinlong Yan, Lin Fan, Xu Guo, Jian Yang, Yiming Chen, Shaofang Zhou, Guodu Liu   +7 more
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Experimental Determination of the Equilibrium Conditions of Binary Gas Hydrates of Cyclopentane + Oxygen, Cyclopentane + Nitrogen, and Cyclopentane + Hydrogen [PDF]

Industrial & Engineering Chemistry Research, 2010
In this work, four-phase hydrate equilibrium data for each of the systems cyclopentane (CP) + water + hydrogen, CP + water + nitrogen, and CP + water + oxygen were measured and are reported in the temperature range of 281.3-303.1 K and the pressure range of 2.27-30.40 MPa. Measurements were made using an isochoric method.
Du Jianwei, Liang Deqing, Li Dongliang, Li Xinjun   +3 more
openaire   +2 more sources

Modification of POSS and their tribological properties and resistant to space atomic oxygen irradiation as lubricant additive of multialkylated cyclopentanes

Friction
Developing functional additive resistant to space atomic oxygen (AO) irradiation through simple molecular design and chemical synthesis to enhance the lubricating performance of multialkylated cyclopentanes (MACs) oil is a significant challenge.
Xingwei Wang, Chaoyang Zhang, Chen Zhao, Yijing Liang, Ming Zhang, Wufang Yang, Bo Yu, Qiangliang Yu, Meirong Cai, Feng Zhou, Weimin Liu   +10 more
doaj   +1 more source