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  • Organic Chemistry  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1981 (1981), S. 993-998 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal and Molecular Structure of 2,19-Dithia[3.3](4,4′)diphenyldiazeno〈2〉phaneThe title compound crystallizes in the triclinic space group Pí with a = 630.1, b = 755.5, and c = 1232.4 pm and ä = 91.46°, β = 93.50°, and γ = 101.71° with one molecule in the elementary cell. The molecule is centrosymmetric and not optically active. Due to the phane structure both azobenzene moieties are slightly deformed. They are essentially parallel in the v. d. Waals distance with a slight parallel displacement. This structure is also evident in the UV spectrum1).
    Notes: Die Titelverbindung kristallisiert triklin in der Raumgruppe Pí mit a = 630.1, b = 755.5 und c = 1232.4 pm sowie ä = 91.46°, β = 93.50° und γ = 101.71°. Die Elementarzelle enthält ein Molekül, das im Kristall in der zentrosymmetrischen, nicht optisch aktiven Form vorliegt. Die beiden Azobenzoleinheiten sind durch die Phan-Struktur nur wenig deformiert, sie sind im v.-d.-Waals-Abstand leicht gegeneinander verschoben. Diese Anordnung folgt auch aus dem UV-Spektrum1).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1981 (1981), S. 1826-1837 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and X-Ray Structure Determination of Bicyclo[4.2.1]non-3-ene-2-one DerivativesMethyl 4-chloro- and methyl 4-bromo-5-oxobicyclo[4.2.1]non-3-ene-1-carboxylate (2) and (3), respectively, 3-bromo-4-chlorobicyclo[4.2.1]non-3-ene-2-one (4), and methyl 5-oxobicyclo[4.2.1]-non-3-ene-1-carboxylate (5) have been prepared from the corresponding bicyclo[3.2.1]oct-2-ene derivatives via the dihalocarbene adducts, and X-ray structure analysis was carried out. In all cases a half-chair conformation was found for the five-membered rings whereas the seven-membered rings possess a twist-chair conformation. The enone system is almost planar in 3 and 5 but somewhat distorted in 2 and 4.
    Notes: 4-Chlor- und 4-Brom-5-oxobicyclo[4.2.1]non-3-en-1-carbonsäure-methylester (2) bzw. (3), 3-Brom-4-chlorbicyclo[4.2.1]non-3-en-2-on (4) und 5-Oxobicyclo[4.2.1]non-3-en-1-carbonsäure-methylester (5) wurden aus den entsprechenden Bicyclo[3.2.1]oct-2-en-Derivaten über die Dihalogencarbenaddukte dargestellt und einer Röntgenstrukturanalyse unterworfen. In allen Fällen liegt der Fünfring in einer Halbsesselkonformation vor, der Siebenring nimmt eine Twist-Sesselkonformation ein. In 3 und 5 ist das Enon-System annähernd planar, in 2 und 4 etwas verdrillt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Surenolactone, a Novel Tetranortriterpenoid A/B-Dilactone from Toona sureni [Blume] Merrill (Meliaceae)Surenolactone (1), the first tetranortriterpenoid-A/B-dilactone found in meliaceae has been isolated from ether extracts of leaves of Toona sureni. The structure of 1 was determined by chemical reactions and on the basis of IR, NMR, MS, and X-ray data.
    Notes: Surenolacton (1), das erste in Meliaceen gefundene Tetranortriterpenoid mit A/B-Dilacton-Struktur wurde aus Etherextrakten der Blätter von Toona sureni [Blume] Merrill isoliert. Die Konstitutionsermittlung erfolgte auf Grund der IR-, NMR- und Massenspektren, der Röntgenstrukturananlyse sowie auf chemischem Wege.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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