Showing papers on "Pyrazole published in 1988"
152 citations
121 citations
TL;DR: Efficient syntheses of approximately 70 simple substituted representatives of pyrazolo[3,4,b]pyridine 1 are reported from the following: (a) suitably substituted pyridines onto which a pyrazole rin...
Abstract: Efficient syntheses of approximately 70 simple substituted representatives of pyrazolo[3,4-b]pyridine 1 are reported from the following: (a) suitably substituted pyridines onto which a pyrazole rin...
104 citations
TL;DR: Based upon the above catalytic, spectral, and immunological properties, it appears that pyrazole induces a form of cytochrome P-450 which is identical to that induced by ethanol and isoniazid.
70 citations
TL;DR: A partir de sous-oxyde de carbone, de chloroformyl phenyl cetene ou de dichlorures d'acides maloniques et d'heterocycles azotes, obtention d'oxo-1 pyrazolo [1,2-a] pyrazolio-8olates-3, d"oxo 1 indolizinioolates, 3, pyrrolo [1.2-b] triazole- 1,2,4io-4olates
Abstract: A partir de sous-oxyde de carbone, de chloroformyl phenyl cetene ou de dichlorures d'acides maloniques et d'heterocycles azotes, obtention d'oxo-1 pyrazolo [1,2-a] pyrazolio-8olates-3, d'oxo-1 indolizinioolates-3, d'oxo-7 pyrrolo [1,2-a] imidazolio-4olates-3, d'oxo-7 pyrazolo [1,2-a] triazole-1,2,4io-4olates-5, d'oxo-7 pyrrolo [1,2-b] triazole-1,2,4io-4olates-5
64 citations
TL;DR: In this paper, a neutral Boron pyrazole species would likely exist in a polymeric structure and thus would be related to B-poly(1-pyrazolyl) pyrazaboles.
Abstract: : The present study was based on the assumption that a neutral Boron Pyrazole species would likely exist in a polymeric structure. Therefore, it should contain the bridging Boron Pyrazole units typical for pyrazaboles but also terminal B bonded Pyrazole groups and thus would be related to B-poly(1-pyrazolyl)pyrazaboles. Furthermore, a (pz)3B-B(pz)3 ion should be similar to a RB(pz)3 ion but for the fact that the former has two polydentate sites. These possibilities should provide for interesting variations as compared to the chemistry of B-(1-pyrazolyl)pyrazaboles and poly(1-pyrazolyl)borates, respectively. Keywords: tetrakis(1-pyrazolyl)dibor ane(4), (monomer, oligomers), bis(pyrazole)-tetrakis(1-pyrazolyl)diborane(4), hexakis(1-pyrazolyl)diborane(4) ate complexes.
60 citations
TL;DR: The results show that the induction of P450-IIEI protein in hamsters by ethanol and pyrazole, an "ethanol-like" inducer, is accompanied by an increase in translatable P 450- IIEI mRNA.
55 citations
TL;DR: In this paper, pyrazole-functionalized chelating polymers were synthesized and characterized by treating with 3,5-dimethyl-1-hydroxymethyl pyrazoles.
52 citations
TL;DR: A series of neutral adducts of dimethyltin(IV) dihalides of general formula Me2SnX2L2 (where L = imidazole, pyrazole) has been prepared by X-ray diffraction as mentioned in this paper.
39 citations
TL;DR: In this paper, the authors obtained novel mono and binuclear complexes of the type Cu{H(NN) 2 }(PPh 3 ) 2 ] with corresponding ligands.
34 citations
Patent•
16 Aug 1988
TL;DR: A cyan color-forming coupler for photographic use is described in this article, where the coupler has improved fastness for heat, humidity, and has a chemical structure represented by the following Formula I; where Z is a group of non-metal atoms necessary for completing a nitrogen-containing six-member heterocyclic ring condensed with the pyrazole ring.
Abstract: A novel cyan color-forming coupler for photographic use is disclosed. The coupler has a improved fastness for heat, humidity, and has a chemical structure represented by the following Formula I; ##STR1## wherein Z is a group of non-metal atoms necessary for completing a nitrogen-containing six-member heterocyclic ring condensed with the pyrazole ring. The six-member ring may be substituted or not substituted provided that the six-member ring does not have be condensed with any ring other than the pyrazole ring; R represents a hydrogen atom or a substituent, and X represents a hydrogen atom or a substituent capable of being split off upon reaction with the oxidized product of a color developing agent.
TL;DR: 1,3-Dinitroalkanes, obtained in almost quantitative yields by Michael additions of nitroalkane to nitro-olefins, react with hydrazines affording pyrazoles, in most cases in high yields as mentioned in this paper.
TL;DR: Isolement des complexes [Cr(NH 3 ) 5 LH]-+fms) 3. Evaluation des pK a et des parametres d'activation as discussed by the authors, et al.
Abstract: Isolement des complexes [Cr(NH 3 ) 5 LH](+fms) 3 . Evaluation des pK a et des parametres d'activation
TL;DR: The pyrazole derivatives of aminoethane N,N-bis (3,5-dimethyl-1-pyrazolyl-methyl) aminoethane (aebd) and N, N-bis(1,pyrazylmethyl)aminoethanes (aEBp) as discussed by the authors form co- ordination compounds with copper(I) of stoichiometry [Cu(L)X], with X = Cl, Br, I and SCN, and X = CF3SO3 and BF4.
TL;DR: In this paper, paracyclophane avec un pont carbonyle (formant une imidazolidone-2) and un pont m-xylylenediamino; complexes avec divers heterocycles azotes
Abstract: Synthese d'un derive de dioxatetraaza [11.10] paracyclophane avec un pont carbonyle (formant une imidazolidone-2) et un pont m-xylylenediamino; complexes avec divers heterocycles azotes
TL;DR: In this article, reactions of N-aminopyrazoles with halogenating reagents (Cl 2, Br2, I2, BrCl, ICl, Cl 2, I4, IBr, N-chlorosuccinimide, and N-bromosculinimides) were examined for the synthesis of 1, 2, 3-triazines.
Abstract: Reactions of N-aminopyrazoles with halogenating reagents (Cl2, Br2, I2, BrCl, ICl, IBr, N-chlorosuccinimide, and N-bromosuccinimide) were examined. Some of these reagents preferentially lead to oxidation of the amino group to give the corresponding 1, 2, 3-triazines as major products, while others mainly gave either or both of 1-amino-4-halopyrazoles and 5-halo-1, 2, 3-triazines as the result of halogenation of the 4-position of the pyrazole ring prior to the oxidation of the amino group. In some cases, the oxidation of the amino group and the halogenation of the pyrazole ring proceeded concurrently to form not only the unhalogenated triazines but also the l -amino-4-halopyrazoles and the 5-halotriazines. Various reagents and reaction conditions were explored to utilize the reaction for the synthesis of halogenated and unhalogenated 1, 2, 3-triazines.
TL;DR: In this article, the effects of substitution on the 13C chemical shifts of pyrazole ring were investigated and the magnitude of the coupling constant 1 J pc was in good agreement with the hybridization of the phosphorus atom.
Abstract: 4-Phosphopyrazoles are prepared with good yield by cyclisation of hydrazone phosphorus compounds and ethylortho formiate. The effects of substitution are investigated on the 13C chemical shifts of pyrazole ring. The magnitude of the coupling constant 1 J pc is in good agreement with the hybridization of the phosphorus atom.
TL;DR: In this paper, four tetradentate nitrogen donor ligands have been prepared by condensation of N-hydroxymethylpyrazoles with ethylenediamines, and the compounds were characterized by their absorption and EPR spectra.
TL;DR: In this paper, the tetradentate ligand tris(3,5-dimethyl-1-pyrazolylmethyl)amine (amtd), of general formula [M(H2O(amtd)(OAc)](ClO4), where M is Co (1) or Ni (2), and N is Co(3) or Cu (4), is described.
TL;DR: In this paper, the properties of four and six-coordinate Cu-pyrazole complexes have been distinguished and the bridging properties of 3,5-demethyl pyrazole ligand rationalized.
Abstract: Copper chloride methylpyrazole complexes have been studied and their quantitative composition and physicalchemical properties determined. On the basis of spectroscopic, electron paramagnetic resonance (c.p.r.) and magnetic studies, the structures of the complexes occurring in solids and the ethanol solutions are discussed. Four- and six-coordinate Cu-pyrazole complexes have been distinguished and the bridging properties of 3,5-demethylpyrazole ligand rationalized.
TL;DR: It is concluded that mouse P450Coh and rat P450ac are not corresponding forms of the same isozyme, and that a P 450ac-like protein, responsible for most of aniline p-hydroxylation and ethanol oxidation, is present in the D2 mouse liver.
TL;DR: In this paper, 4-Diazomethyl-substituted coumarins, 1-methyl-2(1H)-quinolinones and 1-thiocoumarin and their tricyclic analogs were found to be easily cyclized into the corresponding pyrazole isomers condensed with heteroaromatics.
TL;DR: In this paper, the configuration and conformation of pyrazole were established on the basis of 1H-n.m., polarimetric, and crystallographic data, the configuration of which was established based on 1H n.m.
Patent•
22 Aug 1988
TL;DR: An organic nonlinear optical material which is an optically transparent solid solution comprising (a) an organic compound component exhibiting non-linear optical response represented by formula (I): ##STR1## wherein Z1 represents an atomic group, which together with the adjacent carbon atom, forms a substituted or unsubstituted 5- to 6-membered aromatic ring having at least one nitro group as a substituent; and Z2 represents an atom group, that together with an adjacent nitrogen atom, form a substituted pyrrole, imidazole, pyrazole, tri
Abstract: An organic nonlinear optical material which is an optically transparent solid solution comprising (a) an organic compound component exhibiting nonlinear optical response represented by formula (I): ##STR1## wherein Z1 represents an atomic group, which together with the adjacent carbon atom, forms a substituted or unsubstituted 5- to 6-membered aromatic ring having at least one nitro group as a substituent; and Z2 represents an atomic group, which together with the adjacent nitrogen atom, forms a substituted or unsubstituted pyrrole, imidazole, pyrazole, triazole or tetrazole ring, and (b) a polymer. The nonlinear optical material exhibits high nonlinear optical response and excellent transmission to blue light.
TL;DR: The reaction of KBH4 with molten benzotriazole leads to the formation of a series of poly(benzotrizoly)borate anions [HnB(C6H4N3)4−n]− where n = 2, 1 and 0 depending on the temperature.
TL;DR: The 13C spectra of the hydroxymethyl derivatives of pyrrole, furan, 5,5-dimethylhydantoin, imidazole, thiophene, pyrazole, and phenol have been studied and assigned as mentioned in this paper.
Abstract: The 13C spectra of the hydroxymethyl derivatives of pyrrole, furan, 5,5-dimethylhydantoin, imidazole, thiophene, pyrazole, and phenol have been studied and assigned. The substituent parameters for the hydroxymethyl group in pyrrole, thiophene, furan, and imidazole were determined.
TL;DR: Diazotization of amide-N-substituted 4-amino-3-methylpyrazole-5-carboxamides with sodium nitrite and acetic acid produces 3substitized 7-methyl-5H-pyrazolo[4,3d]- 1,2,3-triazin-4(3H)-ones.
Abstract: Diazotization of amide-N-substituted 4-amino-3-methylpyrazole-5-carboxamides 4 with sodium nitrite and acetic acid produces 3-substituted 7-methyl-5H-pyrazolo[4,3-d]- 1,2,3-triazin-4(3H)-ones 6 or amide-N-substituted 3-methyl-4-diazopyrazole- 5-carboxamides 5, depending on the substitution pattern.