Results 41 to 50 of about 20,186 (218)

Katalytischer Schwefelatomtransfer vermittelt durch einen Bis(disulfido)‐Titankomplex

Angewandte Chemie, EarlyView.
Mehrelektronentransformationen mit Titan sind aufgrund der limitierten Zugänglichkeit niedervalenter Vorstufen bislang nur unzureichend untersucht. Die Vier‐Elektronen‐Aktivierung von elementarem Schwefel durch einen Ti(IV)‐Komplex führt zu einem seltenen Bis(disulfido)‐Titankomplex, der die effiziente katalytische Synthese von Isothiocyanaten aus ...
Sebastian Samir Cremer, Peter Coburger, Corinna Czernetzki, Gabriele Hierlmeier   +3 more
wiley   +1 more source

Synthesis of Chromone-Related Pyrazole Compounds

Molecules, 2017
Chromones, six-membered oxygen heterocycles, and pyrazoles, five-membered two-adjacentnitrogen- containing heterocycles, represent two important classes of biologically active compounds.
Clementina M. M. Santos, Vera L. M. Silva, Artur M. S. Silva   +2 more
doaj   +1 more source

Carbamidine-substituted Pyrazoles [PDF]

Nature, 1951
THE ease with which 1-substituted pyrazoles may be converted into the free imino compounds varies with the nature of the 1-substituent and the reacting substance. Thus, 1,3,5-trimethyl pyrazole may be nitrated1 and 1-phenyl pyrazole reduced to the pyrazoline2 without loss of the N-methyl or N-phenyl groups respectively.
F L, SCOTT, C M B, MURPHY, J, REILLY
openaire   +2 more sources

Regioselective Synthesis of 5- and 3-Hydroxy-N-Aryl-1H-Pyrazole-4-Carboxylates and Their Evaluation as Inhibitors of Plasmodium falciparum Dihydroorotate Dehydrogenase

Molecules, 2022
In silico evaluation of various regioisomeric 5- and 3-hydroxy-substituted alkyl 1-aryl-1H-pyrazole-4-carboxylates and their acyclic precursors yielded promising results with respect to their binding in the active site of dihydroorotate dehydrogenase of ...
Luka Vah, Tadej Medved, Uroš Grošelj, Marina Klemenčič, Črtomir Podlipnik, Bogdan Štefane, Jernej Wagger, Marko Novinec, Jurij Svete   +8 more
doaj   +1 more source

Crystal structure of (3,5-dichloro-2-hydroxyphenyl){1-[(naphthalen-1-yl)carbonyl]-1H-pyrazol-4-yl}methanone

Acta Crystallographica Section E, 2014
The title compound, C21H12Cl2N2O3, is a 1,4-diaroyl pyrazole derivative and has three aromatic rings. The dihedral angles between the naphthalene ring system and the pyrazole ring, the pyrazole and phenyl rings and the naphthalene ring system and the ...
Yoshinobu Ishikawa, Yuya Motohashi
doaj   +1 more source

Crystal structure of (3,5-dibromo-2-hydroxyphenyl){1-[(naphthalen-1-yl)carbonyl]-1H-pyrazol-4-yl}methanone

Acta Crystallographica Section E, 2014
In the title compound, C21H12Br2N2O3, a 1,4-diaroyl pyrazole derivative, the dihedral angles between the naphthalene ring system and the pyrazole ring, the pyrazole and benzene rings, and the naphthalene ring system and benzene ring are 50.0 (2), 51.1 (2)
Yoshinobu Ishikawa, Yuya Motohashi
doaj   +1 more source

Synthesis of pyrazole and pyrazole amidocobaloximes

, 2004
Department of Chemistry, Osmania University, Hyderabad-500 007, India E-mail : ssnsirasani @yahoo.com Manuscript received 23 September 2002, revised 23 April 2003. accepted 11 July 2003 A series of cyano (ligand) cobaloximes have been prepared where, the ligand is pyrazole (Pz), 1-(acetamido)pyrazole (Apz), 1-(N-methylacetamido)pyrazole (MAPz), 1 ...
A. Rajeshwar Rao, G. Gopinath, J. V. Madhuri, S. Satyanarayana   +3 more
openaire   +1 more source

Photogenerated Oxetanes as a Gateway to Uphill Cyclopropanation

Angewandte Chemie International Edition, EarlyView.
An atom‐economical route to densely functionalized cyclopropanes from furans and photochemically activated aldehydes is enabled by a unique oxetane‐to‐cyclopropane rearrangement. These cyclopropanes can be used to access complex bioactive scaffolds and serve as a platform for asymmetric cyclopropane synthesis.
Tim Köglmeier, Thomas J. Tiefel, Oliver Reiser   +2 more
wiley   +1 more source

1,5-Dimethyl-4-[(E)-3-phenoxybenzylideneamino]-2-phenyl-1H-pyrazol-3(2H)-one

Acta Crystallographica Section E, 2008
The title Schiff base, C24H21N3O2, adopts an E configuration with respect to the central C=N bond. The pyrazole ring and the central benzene ring attached to the imino group are almost coplanar. The phenyl ring attached to the pyrazole unit is twisted by
Xue-Li Cheng, Zi-Ying Wang, Yang Liu, Feng-Yu Zhang, Yi-Feng Sun   +4 more
doaj   +1 more source

Two tautomers in the same crystal: 3-(4-fluorophenyl)-1H-pyrazole and 5-(4-fluorophenyl)-1H-pyrazole

Acta Crystallographica Section E, 2014
The title co-crystal, 3-(4-fluorophenyl)-1H-pyrazole–5-(4-fluorophenyl)-1H-pyrazole (1/1), C9H7FN2, crystallizes with four independent molecules (A, B, C and D) in the asymmetric unit exhibiting two tautomeric forms (A and D; B and C) due to N—H proton ...
Thammarse S. Yamuna, Manpreet Kaur, Jerry P. Jasinski, Brian J. Anderson, H. S. Yathirajan   +4 more
doaj   +1 more source