Results 81 to 90 of about 35,216 (249)

Substituted nick el pyrazole and palladiumpyruzolyl complexes as catalyst precursors for ethylene polymeization

, 2003
>Magister Scientiae - MScThis study concerns the synthesis of pyrazole and substituted pyrazole nickel complexes of the type [(3,5-R,R',pz)2NiB rz ( Pz : pyrazole; R = R' = cHr (1), tBu (a)l and of the type [(3,5-R,R'pz)aNiBrz R: H, R' : CHr (2)] R: R'
Nelana, S
core  

Chiral Pyrazolinylidene Complexes for Asymmetric Catalysis

Chemistry – A European Journal, EarlyView.
The synthesis and application of pyrazolin‐5‐ylidene NHC chiral‐at‐ruthenium catalysts is reported. The strong donating pyrazolin‐5‐ylidene ligands led to highly electron rich ruthenium complexes, which showed excellent catalytic activity and enantioselectivity in the intramolecular aziridination of an alkene.
Felix Möller, Nemrud Demirel, Thomas Krüger, Linus Plohnke, Jennifer Schröder, Sergei I. Ivlev, Eric Meggers   +6 more
wiley   +1 more source

Microwave versus ultrasound assisted synthesis of some new heterocycles based on pyrazolone moiety

Journal of Saudi Chemical Society, 2010
Different pyrazolone derivatives were prepared by microwave irradiation and ultrasound assisted methods besides the traditional ones. They were used for synthesis of some derivatives of spiropiperidine-4,4′-pyrano[2,3-c]pyrazole, dihydropyrano[2,3-c ...
Aamal A. Al-Mutairi, Fatma E. M. El-Baih, Hassan M. Al-Hazimi   +2 more
doaj   +1 more source

2-{5-[2-(4-Nitrophenoxy)phenyl]-1-phenyl-1H-pyrazol-3-yl}phenol

Acta Crystallographica Section E, 2010
In the title compound, C27H19N3O4, the phenol and pyrazole rings are almost coplanar [dihedral angle = 0.95 (12)°] due to an intramolecular O—H...N hydrogen bond, whereas the phenyl ring is tilted by 40.81 (7)& ...
Ali Haider, Zareen Akhter, Michael Bolte, Muhammad Zia-ul Haq, Humaira M. Siddiqi   +4 more
doaj   +1 more source

Multistep Changes in Spin‐Crossover Temperature Induced by Stepwise Desolvations

Chemistry – A European Journal, EarlyView.
A novel Fe(II) complex (1·3VN) exhibits SCO behavior in which the spin transition temperature sequentially increases and then decreases by stepwise removal of valeronitrile (VN) molecules. These non‐monotonic changes in the transition temperature are explained by the changes in intermolecular interactions among the Fe complex and each valeronitrile ...
Taisei Suzuki, Takuya Shiga, Natsumi Okawa, Nozomi Mihara, Daisuke Okuyama, Reiji Kumai, Hajime Sagayama, Maximilian Seydi Kilic, Kevin Tran, Franz Renz, Masayuki Nihei   +10 more
wiley   +1 more source

1,1′-Bis(1-acetyl-5-methyl-1H-pyrazol-3-yl)ferrocene

Acta Crystallographica Section E, 2011
The title compound, [Fe(C11H11N2O)2], crystallizes with two independent molecules in the asymmetric unit which have have different conformations. In one molecule, the two ferrocene cyclopentadienyl rings are fully eclipsed and the two pyrazole rings are ...
Bei-Bei Zhu, Yao-Cheng Shi, Wen-Bin Shen, Qian-Kun Li   +3 more
doaj   +1 more source

Sustainable Hydrogen Production by Glycerol and Monosaccharides Catalytic Acceptorless Dehydrogenation (AD) in Homogeneous Phase

ChemSusChem, Volume 18, Issue 6, March 15, 2025.
Sustainable hydrogen production can be obtained from hydogen‐rich biomass‐derived organic molecules through Acceptorless Dehydrogenation (AD) reactions. Glycerol and sugars are available in large quantities from industry and can be successfully used as substrates in AD protocols, in the presence of tailored, selective, easily tunable and thermally ...
Sylwia Kostera, Luca Gonsalvi
wiley   +1 more source

Ullmann‐Type N‐Heteroarylation of Nitrogen Heterocycles Catalyzed by Heterogeneous CuNPs/HKUST‐1

EcoEnergy, EarlyView.
A practical strategy for the direct synthesis of CuNPs/HKUST‐1 heterogeneous catalyst was developed and used for the catalyzing Ullmann‐type N‐arylation of N‐heterocycles with high yields, excellent recyclability, and low copper leaching. ABSTRACT Ullmann‐type C–N coupling is an essential reaction to construct functional nitrogen heterocycles, whereas ...
Shuai Yang, Fangshu Han, Yamin Dong, Liangting Wu, Wenchao Tang, Changyan Guo, Jide Wang, Ablimit Abdukader, Chenjiang Liu, Yonghong Zhang   +9 more
wiley   +1 more source

Aqua(4-nitrophthalato)bis[2-(1H-pyrazol-3-yl)pyridine]zinc(II) hemihydrate

Acta Crystallographica Section E, 2011
In the title compound, [Zn(C8H3NO6)(C8H7N3)2(H2O)]·0.5H2O, the ZnII atom shows a distorted octahedral ZnN4O2 coordination environment and is bonded to two 3-(2-pyridyl)-1H-pyrazole ligands via the N atoms, one monodentate 4-nitrophthalate ligand
Hong Wei, Ji-Li Zhao, Lei Ni
doaj   +1 more source

Synthesis of Zwitterionic Tris(pyrazolyl) Ligands and Their Mn(II) Bis‐Chelates Exhibiting Charge–Transfer‐Induced Spin Crossover

European Journal of Inorganic Chemistry, EarlyView.
In this article, a series of zwitterionic scorpionate ligands based on the anionic tris‐(pyrazolyl)borate ligand scaffold is presented. These ligands are used to prepare bis‐chelates with divalent manganese ions. The resulting complexes are studied via magnetic, crystallographic, and electrochemical means to characterize the charge–transfer‐induced ...
Matthew C. Kessinger, Tzu‐Ching Cheng, Cameron Brillhart, Sreenivasulu Chinnabattigalla, Carla Slebodnick, Amanda J. Morris   +5 more
wiley   +1 more source