Results 211 to 220 of about 36,585 (245)

Nickel(II) complexes of pyrazole and substituted pyrazoles

Journal of Inorganic and Nuclear Chemistry, 1970
Abstract Complexes of pyrazole (pz), 3-methylpyrazole (3MePz) and 3,5-dimethylpyrazole (DMP) with nickel(II) salts can be crystallised from aqueous or ethanolic solutions. With pyrazole, tetragonal complexes of the type NiX2(pz)2 (X = Cl, Br) and Ni X 2 ( pz ) 4 (X = Cl, Br, NO 3 , 1 2 SO 4 ) are formed while 3-
D. Nicholls, B.A. Warburton
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Pyrazole, 3(5)-methyl pyrazole and 3,5-dimethyl pyrazole complexes of tin(IV) halides

Inorganica Chimica Acta, 1977
Abstract Complexes of tin(IV) halides with pyrazole, 3(5)methyl pyrazole and 3,5-dimethyl pyrazole of the type SnX4·L2 were prepared. All the isolated solids were non-electrolytes in acetonitrile. The IR spectra of the complexes (600–180 cm−1 were consistent with a trans-octahedral configuration in the solids state.
J.R. Masaguer, E. Freijanes, J. Sordo, J.S. Casas, M.R. Bermejo   +4 more
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Some iodinated pyrazole derivatives

Journal of the Chemical Society C: Organic, 1966
Some iodinated pyrazoles, carrying a carboxylic or sulphonic acid group either in the nucleus or in a side chain attached to a ring nitrogen, were prepared, but were of no use as X-ray contrast media.
D, Giles, E W, Parnell, J D, Renwick
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Octahedral molybdenum iodide clusters with pyrazole or pyrazolate ligands

Dalton Transactions
Hexaaqua or hexahydroxo molybdenum iodide cluster complexes obtained in one step were shown to be accessible complexes for synthesis of clusters with pyrazole or pyrazolate ligands.
Ksenia S. Kozlova, Alexey S. Berezin, Natalia V. Kuratieva, Michael A. Shestopalov, Anton A. Ivanov   +4 more
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Ligand Exchange on Pyrazolate-κN-μ-pyrazolate and Pyrazole-κN-μ-pyrazolate Binuclear Nickel Complexes

Organometallics, 2000
Compounds containing bridging pyrazolate and terminal pyrazolate or pyrazole ligands of type Ni2(PMe3)2(L-κN)(μ2-η1:η3-CH2-o-C6H4)(μ2-L-κN,N‘) (L = 3,5-dimethylpyrazolate (Pz‘ ‘), 3b, or 3,5-di-tert-butylpyrazolate (Pz**), 3c); Ni2(PMe3)2(Pz**-κN)(μ2-η1:η3-CH2-o-C6H4)(μ2-Pz‘ ‘-κN,N‘), 4, and [Ni2(PMe3)2(HPz‘ ‘-κN)(μ2-η1:η3-CH2-o-C6H4)(μ2-Pz-κNN‘)](X ...
Juan Cámpora, Jorge A. López, Celia M. Maya, Pilar Palma, Ernesto Carmona, Caridad Ruíz   +5 more
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Knorr Pyrazole Synthesis

2009
Also known as Knorr reaction. Reaction of hydrazine or substituted hydrazine with 1,3-dicarbonyl compounds to provide the pyrazole or pyrazolone ring system. Cf. Paal–Knorr pyrrole synthesis.
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Preparation of Pyrazole–Pyrazolate Half‐Sandwich Complexes of Ruthenium and Osmium

European Journal of Inorganic Chemistry, 2010
AbstractPyrazole (HRpz) [MCl(η6‐p‐cymene)(HRpz)L]BPh4 (1–8) and imidazole (HIm) complexes [MCl(η6‐p‐cymene)(HIm)L]BPh4 (9–10) [M = Ru, Os; R = H, 3‐Me, 3,5‐Me2; L = P(OEt)3, PPh(OEt)2, PPh2OEt, CNtBu] were prepared by allowing the dichloro compounds MCl2(η6‐p‐cymene)L to react with the appropriate azole in the presence of NaBPh4.
ALBERTIN, Gabriele, ANTONIUTTI, Stefano, J. Castro, S. García Fontán   +3 more
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Quadrupole coupling in 1-d-pyrazole and 4-d-pyrazole principal quadrupole coupling constants for pyrazole

Journal of Molecular Structure, 1971
Abstract The hyperfine structure of a number of lines in the microwave spectra of 1-D-pyrazole and 4-D-pyrazole has been measured and analysed. First order quadrupole coupling theory for the two nitrogen atoms has been used to generate computer simulated multiplets for optimal fitting to the corresponding spectrometer tracings.
G.L. Blackman, R.D. Brown, F.R. Burden, A. Mishra   +3 more
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¹³C NMR of pyrazoles

Magnetic Resonance in Chemistry, 1993
AbstractThe carbon‐13 chemical shifts and coupling constants of 1168 pyrazoles are reported, some of them in several solvents. These data are briefly discussed on the basis of statistical treatment and qualitative comparisons.
Begtrup, Mikael, Boyer, Gérard, Cabildo, Pilar, Cativiela, Carlos, Claramunt, Rosa, Elguero, José, García, José Ignacio, Toiron, Catherine, Vedsø, Per   +8 more
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Bioactive Pyrazoles

This chapter discusses about bioactive pyrazoles, which have garnered substantial attention in medicinal chemistry and drug development. Pyrazoles are five-membered heterocyclic compounds characterized by a nitrogen-rich structure, imparting them with unique physicochemical and biological and making them useful for treating various diseases.
Aditi Boruah, Ariful Islam, Pranjal K. Baruah   +2 more
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