University of Cologne
Publishes on Porphyrin and Phthalocyanine Chemistry, Catalytic C–H Functionalization Methods, Photodynamic Therapy Research Studies. 11 papers and 250 citations.
Add your photo, update your bio, and get notified when your ranking changes.
The first total synthesis of the natural product (+)-K252a (2) has been achieved in 12 steps from commercially available materials, with a longest linear sequence of seven steps and an overall yield of 21%. The synthetic strategy employs novel rhodium carbenoid chemistry in the construction of both the indolocarbazole aglycon (4) and the carbohydrate moiety (9).
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDevelopment of a Rhodium Carbenoid-Initiated Claisen Rearrangement for the Enantioselective Synthesis of α-Hydroxy Carbonyl CompoundsJohn L. Wood, George A. Moniz, Derek A. Pflum, Brian M. Stoltz, Alexandra A. Holubec, and Hans-Jürgen DietrichView Author Information Sterling Chemistry Laboratory, Department of Chemistry Yale University, New Haven, Connecticut 06520-8107 Cite this: J. Am. Chem. Soc. 1999, 121, 8, 1748–1749Publication Date (Web):February 10, 1999Publication History Received16 September 1998Published online10 February 1999Published inissue 1 March 1999https://pubs.acs.org/doi/10.1021/ja983294lhttps://doi.org/10.1021/ja983294lrapid-communicationACS PublicationsCopyright © 1999 American Chemical SocietyRequest reuse permissionsArticle Views2910Altmetric-Citations71LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-AlertscloseSupporting Info (2)»Supporting Information Supporting Information SUBJECTS:Alcohols,Claisen rearrangement,Ketones,Mixtures,Rhodium Get e-Alerts
Refinement of the molecular charge distribution in cyanuric acid. Comparison of observed and calculated electron densities. X. Theoretical static difference densities at experimental resolution and theoretical dynamic difference densities perpendicular to the molecular plane for cyanuric acid
Record extinctions ε of 1.6×106 and 1.0×106 for the UV/Vis Soret bands, as well as extreme chemical shifts for the inner and outer perimeter protons in the 1H NMR spectra, characterize the two closely related 26π porphyrinoids 1 and 2, respectively. The dichotomy that 1 and 2 differ markedly in the extinctions of the Soret bands (appearing at nearly the same wavelength) yet almost agree—within the limits of comparison—in the 1H NMR spectra is explained convincingly on the basis of the molecular structures of the two compounds.
Rekordextinktionenε von 1.6×106 bzw. 1.0×106 der UV/Vis-Soret-Banden sowie extreme chemische Verschiebungen der äußeren und inneren Perimeter-Protonen in den 1H-NMR-Spektren kennzeichnen die beiden nahe verwandten 26π-Porphyrinoide 1 und 2. Die Dichotomie, dass 1 und 2 sich in den Extinktionen der Soret-Banden (nahezu gleiche Wellenlänge) auffallend unterscheiden, in den 1H-NMR-Spektren im Rahmen der Vergleichsmöglichkeiten dagegen praktisch übereinstimmen, findet auf der Basis der Molekülstrukturen der beiden Verbindungen eine überzeugende Erklärung.