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  • Isotopengeologie  (1)
  • isoxazolesoxetanesPaternò–Büchi reactionphotochemistry  (1)
  • 1
    Publication Date: 2011-01-27
    Description: The first photocycloadditions of aromatic and aliphatic aldehydes to methylated isoxazoles are reported. The reactions lead solely to the exo -adducts with high regio- and diastereoselectivities. Ring methylation of the isoxazole substrates is crucial for high conversions and product stability. The 6-arylated bicyclic oxetanes 9a – 9c were characterized by X-ray structure analyses and showed the highest thermal stabilities. All oxetanes formed from isoxazoles were highly acid-sensitive and also thermally unstable. Cleavage to the original substrates is dominant and the isoxazole derived oxetanes show type T photochromism. Beilstein J. Org. Chem. 2011, 7, 127–134. doi:10.3762/bjoc.7.18
    Keywords: isoxazolesoxetanesPaternò–Büchi reactionphotochemistry
    Electronic ISSN: 1860-5397
    Topics: Chemistry and Pharmacology
    Published by Beilstein-Institut
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  • 2
    Publication Date: 2021-03-29
    Description: Radiocarbon, reservoir age, ocean circulation, projection age, top-to-bottom age, B-P age. - In paleoceanography and paleoclimatology radiocarbon is frequently used to date carbonaceous samples of the past 50,000 years and as a proxy to reconstruct circulation states of the ocean. Temporal variations of the atmospheric radiocarbon concentration, caused by a varying radiocarbon production rate or changes in the global carbon cycle, lead to dating uncertainties and also limit the usability of radiocarbon as an oceanographic proxy. In order to analyze and correct the influence of varying atmospheric radiocarbon on the ocean, radiocarbon has been included as a tracer to a global climate model (University of Victoria Earth System Climate Model). This model was forced by the reconstructed atmospheric radiocarbon production rate, to predict differences between atmospheric and marine radiocarbon age, the so-called reservoir age, spatially and temporally.
    Description: thesis
    Keywords: 551.701 ; 550 ; Geochronologie einzelner Regionen ; Holozän ; Isotopengeologie ; Geochemische Kreislaufmodelle
    Language: German
    Type: monograph , publishedVersion
    Format: 124 S.
    Format: application/pdf
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