Výsledky vyhledávání - "David C. Reames"

The reactions of C(α),O-dilithiooximes, C(α),N-dilithiophenylhydrazones, and C(α),N,N-trilithiohydrazones with diethyl oxalate to give biisoxazoles, bipyrazoles, and pyridazones

Autor: Luther W. Dasher, Wayne M. Hollinger, Charles R. Hauser, C. Wayne Thomas, David C. Reames, Charles F. Beam, Ronda M. Sandifer, Robert S. Foote

Publikováno v: Journal of Heterocyclic Chemistry. 12:1159-1163

Several C(α), O-dilithiooximes were condensed with diethyl oxalate and acid-cyclized to give biisoxazoles. Only dilithio p-fluoroacetophenone phenylhydrazone gave the bipyrazole when condensed with this diester. Other C(α), N-dilithiophenylhydrazon

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7f1b68c9cb473b889231337f9559e502
https://doi.org/10.1002/jhet.5570120614

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New method for the preparation of 4-acylpyrazoles. Reaction of C(.alpha.),N dianions of phenylhydrazones with acid chlorides

Autor: Wayne M. Hollinger, Charles R. Hauser, Matilda Perkins, Charles E. Harris, Neal L. Shealy, David C. Reames, Luther W. Dasher, Ronda M. Sandifer, Charles F. Beam

Publikováno v: The Journal of Organic Chemistry. 40:514-516

Aus den Phenylhydrazonen (I) entstehen die Dilithio-Derivate (II), die mit den Saurechloriden (III) uber die Zwischenstufen (IV)-(VII) zu den 4-Acylpyrazolen (VIII) cyclisiert werden.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::935118a20cace642904228f31b1fa1dc
https://doi.org/10.1021/jo00892a032

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ChemInform Abstract: SELECTIVE HALOGEN-LITHIUM EXCHANGE IN SOME SECONDARY AND TERTIARY (BROMOPHENYL)ALKYL HALIDES

Autor: William E. Parham, Charles K. Bradsher, David C. Reames

Publikováno v: Chemischer Informationsdienst. 13

Aus den Halogeniden (I) erhalt man mit Butyllithium bei niederer Temperatur die Li-Verbindungen (II), die mit Wasser zu (III) hydrolysiert werden, wahrend Cyclohexanon (IV) zu den spirocyclischen Ethern (V) fuhrt.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ef8b760920e90fd15d9d9a4dad1009a2
https://doi.org/10.1002/chin.198217130

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ChemInform Abstract: PREPARATION OF TRI- AND TETRAMETHYLENEISOXAZOLES

Autor: Ronda M. Sandifer, Wayne M. Hollinger, Charles E. Harris, Neal L. Shealy, Charles F. Beam, Luther W. Dasher, David C. Reames, Keith D. Shealy

Publikováno v: Chemischer Informationsdienst. 8

The syntheses of several tri‐ and tetramethyleneisoxazoles resulting from the condensation of C( α )O‐dilithioximes with esters, followed by acid cyclization, are described.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::61d74d36db42fb8f57dedf6b5f0416ee
https://doi.org/10.1002/chin.197703210

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An easy method for the preparation of 4-acylisoxazoles from C(α),O-dianions of oximes

Autor: Wayne M. Hollinger, David C. Reames, Charles F. Beam, Ronda M. Sandifer, Lynn M. Shaffer

Publikováno v: Journal of Heterocyclic Chemistry. 13:607-608

Several C(α),O-dilithiooximes of aromatic ketones were condensed with aroyl chlorides. The presumed diacyl intermediates were not isolated, and the reaction mixtures containing them were acid-cyclized to give 4-acylisoxazoles in 22–62% yield.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e405fa27332d276595661149a59ee9c4
https://doi.org/10.1002/jhet.5570130338

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