Výsledky vyhledávání - "John F. Hansen"

4-WEEK INHALATION TOXICITY STUDY WITH A MIXTURE OF DICHLOROETHYLENE AND PERFLUOROBUTYLETHYLENE IN RATS

Autor: Nancy E. Everds, David B. Warheit, Linda A. Malley, John F. Hansen

Publikováno v: Inhalation Toxicology. 14:773-787

Inhalation studies were conducted to determine the potential subchronic toxicity of a mixture of trans-1,2-dichloroethylene (70%), cis-1,2-dichloroethylene (5%), and perfluorobutylethylene (25%). Groups of rats were exposed to 0, 400, 2000, or 8000 p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cdeb116644085641873cbecce6e0ae16
https://doi.org/10.1080/08958370290084638

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A novel 2:1 cycloadduct of dimethyl acetylenedicarboxylate with 3,5-diphenyl-4-methoximino-4H-pyrazole 1,2-dioxide

Autor: Kalyan Nagulapalli, Gregory M. Ferrence, Joel M. Esken, Andre L. Kilpatrick, John F. Hansen

Publikováno v: Tetrahedron Letters. 44:3789-3791

Two equivalents of dimethyl acetylenedicarboxylate react with 3,5-diphenyl-4-methoximino-4H-pyrazole 1,2-dioxide in acetonitrile under reflux. The major product was shown by X-ray analysis to be a 5,8-epoxyisoxazolo[2,3-d]-[1,4]-diazepine derivative.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::51589ecde80551f226561f02178fe189
https://doi.org/10.1016/s0040-4039(03)00781-0

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Evaluation of a method used to test for potential toxicity of carpet emissions

Autor: T.A. Kaempfe, Greg R. Christoph, Judith C. Stadler, John F. Hansen, B.R. Dudek

Publikováno v: Food and Chemical Toxicology. 32:1073-1087

After a private testing laboratory had reported mortality, neurotoxicity, and respiratory irritation in mice exposed to emissions from heated carpet in a modified application of the sensory irritation test (ASTM E981-84), the studies reported in this

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::553f5ad906818df6a7868f16fe881440
https://doi.org/10.1016/0278-6915(94)90149-x

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Stereochemical effects in the nitrosation of some α,β-unsaturated ketoximes. Formation of 1-hydroxypyrazole 2-oxides and 4-oximino-4,5-dihydroisoxazoles

Autor: John A. Easter, John F. Hansen

Publikováno v: Journal of Heterocyclic Chemistry. 31:1481-1486

Several α,β-unsaturated ketoximes R1CH=CHC(=NOH)R2 were nitrosated using butyl nitrite in aqueous ethanol in the presence of copper(II) sulfate and pyridine. The product distribution varied depending on whether the oxime hydroxyl group was syn or a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::028456424ad4f01ab4286f148ef02cea
https://doi.org/10.1002/jhet.5570310633

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Nitrosation of methyl and phenyl styryl ketoximes under oxygen. Formation of 4-nitro-1-hydroxypyrazole 2-oxides and 3,5-diphenyl-4-nitrato-4,5-dihydroisoxazole

Autor: Paul J. Georgiou, John F. Hansen

Publikováno v: Journal of Heterocyclic Chemistry. 31:1487-1491

The nitrosation of the oximes of 4-phenyl-3-buten-2-one and 1,3-diphenyl-2-propen-1-one under oxygen has been reinvestigated. In addition to 4-oxo- and 4-oximino-4H-pyrazole 1,2-dioxides previously reported, the reactions give 4-nitro-1-hydroxypyrazo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1c006498915026c1a84e96ee90769949
https://doi.org/10.1002/jhet.5570310634

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Preparation of 4-bromo-1-hydroxypyrazole 2-oxides by nitrosation of α-bromo-α,β-unsaturated ketoximes

Autor: David A. Eckert, Karen J. Hunt, David A. Little, John F. Hansen, John A. Easter

Publikováno v: Journal of Heterocyclic Chemistry. 31:281-286

Nitrosation of the oximes of 3-bromo-3-penten-2-one, 3-bromo-4-phenyl- 3-buten-2-one, and 2-bromo-1,3-diphenyl-2-propen-1-one using sodium ni- trite in acetic acid gave low yields of 4-pyrazolone 1,2-dioxides. Nit- rosation using butyl nitrite in the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9c94ce2f64474a0a61b7d26987d6adc7
https://doi.org/10.1002/jhet.5570310204

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Preparation and nitrosation of 3,4-dimethyl-3-penten-2-one (e)- and (z)-oximes. Formation of 3,3,4,5-tetramethyl-3H-pyrazole 1,2-dioxide and of 2-isoxazoline derivatives

Autor: Bennett H. Novak, John F. Hansen

Publikováno v: Journal of Heterocyclic Chemistry. 31:105-111

The stereoisomeric (E)- and (Z)-oximes of 3,4-dimethyl-3-penten-2-one were prepared and nitrosated with butyl nitrite in methanol. The (E)-oxime gave 3,3,4,5-tetramethyl-3H-pyrazole 1,2-dioxide in nearly quantitative yield, while the (Z)-oxime reacte

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https://doi.org/10.1002/jhet.5570310119

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Preparation of 3(5)-phenyl-1-hydroxypyrazole 2-oxide and 4-methyl-3(5)-phenyl-1-hydroxypyrazole 2-oxide

Autor: Matthew L. Luther, John F. Hansen

Publikováno v: Journal of Heterocyclic Chemistry. 30:1163-1166

Nitrosation of acrylophenone oxime or of methacrylophenone oxime with n-butyl nitrite in the presence of pyridine and copper(II) sulfate gives the copper complexes of the title compounds. The free 1-hydroxypyrazole 2-oxides are isolated by treating t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::30b7e2769d373008bb589b25c20e5f5c
https://doi.org/10.1002/jhet.5570300461

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