7,182 research outputs found
Mechanistic Investigations into the Palladium-Catalyzed Decarboxylative Allylic Alkylation of Ketone Enolates Using the PHOX Ligand Architecture
No full textPalladium-catalyzed asymmetric allylic alkylation has become a large and important field for chemical synthesis. Many methodologies in this field offer mild conditions under which challenging and important molecular features can be reliably synthesized, including chiral all-carbon quaternary stereocenters. As a result, palladium- catalyzed asymmetric allylic alkylation has found significant use in total synthesis, and growing use in industry. While the general process of palladium-catalyzed asymmetric allylic alkylation has been studied for decades, there have been a number of recent modifications and developments, such as asymmetric versions of decarboxylative allylic alkylation procedures that are not yet well understood. The development of future implementations and improvements to palladium-catalyzed asymmetric allylic alkylation and related methodologies is expected to be facilitated by a better understanding of these more recent developments, and thus further mechanistic investigation is warranted.
Reported herein is a set of investigations into the palladium-catalyzed decarboxylative asymmetric allylic alkylation of ketone enolates using the PHOX ligand architecture. By monitoring the reaction via 31P NMR, a series of previously unidentified key intermediates is discovered. Two representatives of these key intermediates are isolated and characterized. The solution behavior of these species under reaction-like conditions is studied along with a few novel and related complexes. The role of these intermediates and their impact on the behavior of the reaction and product formation is discussed. Previously confounding experimentally observed behavior for this methodology is rationalized via the properties elucidated for these discovered intermediates.</p
Interviews with African Americans in Utah, Ruby Nathaniel
No full textTranscript (41 pages) of an interview by Leslie Kelen with Ruby Nathaniel on February 10, 1983. From Interviews with African Americans in UtahMrs. Nathaniel recalls her childhood in Salt Lake City, interracial parentage, employment, relationships with whites, civil rights, and her church affiliation
A condição feminina na sociedade ocidental contemporânea: uma releitura de A letra escarlate de Nathaniel Hawthorne
No full textTese (doutorado) - Universidade Federal de Santa Catarina, Centro de Filosofia e Ciências Humanas. Programa de Pós-Graduação Interdisciplinar em Ciências HumanasEste trabalho trata principalmente sobre a necessidade que há de se valorizar o aspecto "feminino" em nossas vidas e sociedades. Da urgência que temos de questionar e refletir sobre o papel da mulher na sociedade contemporânea ocidental e sobre os vários tipos de estigmatização que ainda sofre nos meios em que vive. Para tanto, escolhemos analisar o romance A Letra Escarlate (1850), de Nathaniel Hawthorne. Primeiro apresentamos uma visão mítica-histórica, onde se resgata o conceito "feminino," para demonstrar a relevância de se pesquisar a condição e a identidade feminina na sociedade contemporânea ocidental, através da obra de Marija Gimbutas, em The Language of the Goddess (2001) e de Edward Whitmont, em O Retorno da Deusa (2001) entre outros. Segundo, pela teoria da "jornada do herói" de Joseph Campbell, em O Herói de Mil Faces (2002), com ênfase na "trajetória heróica" e como esta se aplica à análise da estrutura profunda do romance e à trajetória de sua heroína Hester Prynne. Terceiro, pelo estudo simbólico do conteúdo do romance, onde se mostra o significado profundo dos elementos que compõem a trajetória mítica em questão. Para tanto usamos a obra de J. E. Cirlot, Dictionary of Symbols (1998) entre outros. Quarto, através da teoria da psicologia social, que se refere ao fenômeno da "estigmatização," abordado através da teoria de Irving Goffman em Estigma: Notas sobre a Manipulação da Identidade Deteriorada (1988), complementada pelas teorias de Henri Tajfel e Joseph P. Forgas (1981) sobre identidade social, categorização, auto-categorização e estereotipia. Quinto, pelas reflexões encontradas na História das mulheres, através das quais fazemos uma recapitulação da condição feminina nos séculos XVII, XVIII, e XIX e como esta pode ser comparada àquela da era contemporânea. Aqui contamos com a obra de Michelle Perrot e George Duby em A História das Mulheres no Ocidente entre outros
Interviews with African Americans in Utah, Nathaniel Wright, Interview 2
No full textTranscript (43 pages) of an interview by Leslie Kelen with Nathaniel Wright on August 9, 1983. From Interviews with African Americans in UtahMr. Wright recalls an early accident at age seven that led to his legs being amputated, a somewhat affluent lifestyle in Connecticut, his employment at Hill Field during World War Two, his long association with the clubs and hotels on Ogden\u27s 25th Street, his marriage, and his problems with alcohol
Hilterflingen
No full textMedium: lithograph"Hilterflingen" [1994.2482.000.000], Green, Nathaniel Everett, G. Rowney & Co.Artist and Role: Green, Nathaniel Everett, LithographerArtist and Role: Rowney, G, PublishersExtent: sheet 56.1 x 37.
Rapport de N. F. Uniacke et George Vanfelson à sir Francis Nathaniel Burton sur une suggestion de Burton que Uniacke et Vanfelson se présentent aux prochaines élections
No full text4 pages, original (?)Rapport de N. F. Uniacke et Geo[rge] Vanfelson à sir Francis Nathaniel Burton sur : une suggestion de Burton que Uniacke et Vanfelson se présentent aux prochaines élections; la réforme du Conseil Exécutif; sa croissance; la présence des juges au Conseil; l'éducation publique des catholiques; la loyauté des Canadiens (surtout pendant l'administration de sir G[eorge] Prevost); la concession des terres aux Canadiens et aux émigrants britanniques; la possibilité du succès électoral si on adopte des réformes
Nathaniel Faulkhead
No full textThe author discusses the life of Nathaniel Faulkhead, who was Treasurer of the Echo Publishing House in Australia and a high ranking member of the Masonic Lodge
Hanscom, Nathaniel
No full textCarte de Visite of Captain Nathaniel Hanscom, 3rd Maine Infantry, Company G; From the MacDonald Collectionhttps://digitalmaine.com/arc_civilwarportraits/2252/thumbnail.jp
Letter, Nathaniel P. Banks to James Redpath, October 1, 1873
No full textThis handwritten letter, dated October 1, 1843, is written from Nathaniel P. Banks, a Union general during the Civil War to James Redpath, an American journalist and anti-slavery activist. The letter is a response to Redpath\u27s request for Banks to go to Brunswick, New York on December 16 and updates Redpath on Banks\u27 current travel plans. The back of the letter has Banks\u27 name, location, and the date. This letter was found tipped into volume four, between pages 326-327 of Abraham Lincoln : A History by John G. Nicolay and John Hay.https://scholarsjunction.msstate.edu/fvw-manuscripts-nicolay-and-hay-documents/1024/thumbnail.jp
Hanscom, Nathaniel
No full textCarte de Visite of Captain Nathaniel Hanscom, 3rd Maine Infantry, Company G; From the MacDonald Collectionhttps://digitalmaine.com/arc_civilwarportraits/2252/thumbnail.jp
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