Výsledky vyhledávání - "John S. Helmick"

Thermal decomposition of the rubber vulcanization agent, zinc dibenzyldithiocarbamate, and its potential role in nitrosamine formation in hams processed in elastic nettings

Autor: John S. Helmick, Walter Fiddler

Publikováno v: Journal of Agricultural and Food Chemistry. 42:2541-2544

The thermal decomposition of zinc dibenzyldithiocarbamate (ZnDBzDTC), a compound used in the formulation of rubber and a possible precursor for N-nitrosodibenzylamine (NDBzA), was studied by a variety of thermal and spectroscopic techniques. At 326 o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::54fa665488d029ee0cdf5aff7d896c88
https://doi.org/10.1021/jf00047a031

Zobrazit plný text záznamu

Reactivity and selectivity of nitrenium ions derived from ester derivatives of carcinogenic N-(4-biphenylyl)hydroxylamine and the corresponding hydroxamic acid

Autor: Michael Novak, Hope E. Peters, Mary Jo Kahley, Emily Eiger, John S. Helmick

Publikováno v: Journal of the American Chemical Society. 115:9453-9460

N-Acetyl-N-(sulfonatooxy)-4-aminobiphenyl (1a) and N-(4-biphenylyl)-O-pivaloylhydroxylamine (1c) decompose in 5% CH 3 CN/H 2 O, μ=0.5 M, at 20 o C via rate-limiting N-O bond heterolysis to generate the nitrenium ion interediates 2a and 2b, respectiv

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b6cf533b662ec71a17f003da12dcd900
https://doi.org/10.1021/ja00074a010

Zobrazit plný text záznamu

The electrochemical preparation and kinetic and product studies of acylated quinol and quinol ether imines. In search of the hydrolysis products of the ultimate carcinogen of N-acetyl-2-aminofluorene

Autor: William M. Clark, Kanchugarakoppal S. Rangappa, Nicholas H. Oberlies, John S. Helmick, Michael Novak, John S. Swenton

Publikováno v: The Journal of Organic Chemistry. 58:867-878

The N-acetyl and benzoyl derivatives of 4-methoxy-4-phenyl-2,5-cyclohexadienonime ine and the N-benzoyl derivative of 4-hydroxy-4-phenyl-2,5-cyclohexadienoimnei ne (la-c) have been prepared via anodic oxidation of the corresponding amide of 4-aminobi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::02efd87bb4c7aa5d8c19e106c7cf2504
https://doi.org/10.1021/jo00056a019

Zobrazit plný text záznamu

ChemInform Abstract: Mechanism of the Reaction of Carbon and Nitrogen Nucleophiles with the Model Carcinogens O-Pivaloyl-N-arylhydroxylamines: Competing SN2 Substitution and SN1 Solvolysis

Autor: John S. Helmick, Julie L. Heinrich, Kristy A. Martin, Michael Novak

Publikováno v: ChemInform. 22

The reaction of N,N-dimethylaniline and aniline with the O-pivaloyl-N-arylhydroxylamines in MeOH exhibits second-order kinetics and generates products of nucleophilic attack on the nitrogen of the hydroxylamine derivative. The characteristics of this

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::aa64416e4951c8dce4a407b7b6ff2826
https://doi.org/10.1002/chin.199132061

Zobrazit plný text záznamu

ChemInform Abstract: The Electrochemical Preparation and Kinetic and Product Studies of Acylated Quinol and Quinol Ether Imines. In Search of the Hydrolysis Products of the 'Ultimate' Carcinogen of N-Acetyl-2-aminofluorene

Autor: Kanchugarakoppal S. Rangappa, William M. Clark, John S. Helmick, Nicholas H. Oberlies, Michael Novak, John S. Swenton

Publikováno v: ChemInform. 25

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::82f4fadf5ad781f5929f1b14cc701279
https://doi.org/10.1002/chin.199405034

Zobrazit plný text záznamu

Mechanism of the reaction of carbon and nitrogen nucleophiles with the model carcinogens O-pivaloyl-N-arylhydroxylamines: competing SN2 substitution and SN1 solvolysis

Autor: Kristy A. Martin, John S. Helmick, Michael Novak, Julie L. Heinrich

Publikováno v: Journal of the American Chemical Society. 113:3459-3466

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::13b4a2034cf9662a44cc0524902ff3e0
https://doi.org/10.1021/ja00009a035

Zobrazit plný text záznamu

Vyhledávací nástroje:

Upřesnit hledání