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  • Bis[tris(1, 2-dimethoxyethan)lithium(1 +)]-1, 4-bis(trimethylsilyl)-1,1,4,4-tetrakis (pentacarbonylchrom(0))-tetraphos-2-phenat(2-)  (1)
  • Organic Chemistry  (1)
  • Wiley-Blackwell  (2)
  • American Meteorological Society
  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 335 (1993), S. 345-350 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Addition of α-Ketoenamines to 2-Acetyl-p-benzoquinoneAddition of 2-morpholino-2-cyclohex-1-en-one 2 to 2-acetyl-quinone 1 yields benzo[c][4 H]chromen-4,7,10-trion 4 which is unstable and rearranges to 5. 4 is converted to 3-(2,5-dihydroxy-phenyl)-2-morpholino-2-cyclohex-1-en-on 3 thermically and to dibenzo[b,d]furan-4-on 7 acid catalyzed. The structure of 7 is secured by independent synthesis. Dibenzo[b,d]furan-4-on 14 is the product of reaction from 2-(p-toluidino)-2-cyclohex-1-en-on 9 and 1 with benzo[c][4 H]chromen-4,7,10-trion 10 as intermediate. By proton catalysis 5-acetyl-6-hydroxy-carbazol-1-on 13 and 4-oxo-cyclohexa[c]isochinolinium hydrochlorid 15 is obtained from 10. 1 H-cyclopenta[d]furan-3-on 17 is formed by addition of 2-(p-toluidino)-2-cyclopent-1-en-on 16 to 1. It is rearranged by proton catalysis to 3-oxo-1 H-cyclopenta[c]isochinolinium salt 18. Reaction of cyclopentan-1,2-dione and 1 yields 3 aH-cyclopenta[c]isochromen-3,6,9-trion 20, rearranging to 1 H-cyclopenta[b]benzo[d]furan-3-on 21. The stereochemistry of adducts is discussed in connection with the course of the reaction, spectroscopical evidence, molecular modelling and calculation of HOMO/LUMO and AO-coefficients.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: [Li(DME)3]2{(SiMe3)[Cr(CO)5] 2 P—P = P—P[Cr(CO)5]2[(SiMe3)]} ; Bis[tris(1, 2-dimethoxyethan)lithium(1 +)]-1, 4-bis(trimethylsilyl)-1,1,4,4-tetrakis (pentacarbonylchrom(0))-tetraphos-2-phenat(2-) ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Complexes of P-rich Phosphanes and Silylphosphanes. VII. Formation and Structure of [Li(DME)3]2{(SiMe3)[Cr(CO)5]2 P-P = P-P[Cr(CO)5]2(SiMe3)}Deep red crystals of the title compound 1 are produced in the reaction of LiP(Me3Si)2[Cr(CO)5] with 1, 2-dibromoethane in DME. The structure of 1 was derived from the investigation of the 31P-NMR spectra and confirmed by a single crystal structure determination. 1 crystallizes in the space group P1 (no. 2); a = 1307.8(5)pm, b = 1373.1(5)pm, c = 1236.1(4)pm, α = 106.22(4)°, β = 88.00(3)°, γ = 115.52(4)° and Z = 1. 1 forms a salt composed of a dianion R2R4′P42- (R = SiMe3, R′ = Cr(CO)5) and solvated Li+ cations. The zigzag shaped dianion possesses the symmetry 1-Ci. The distances d(P—P) = 202.5(1)pm and d(P—P) = 221.9(1)pm correspond to a double bond and single bonds, respectively. The distances d(Cr—P) = 251.1(1) pm and 255.3(1) pm are larger than those observed so far which might be caused by the charge distribution in the dianion.
    Notes: Bei der Umsetzung von LiP(SiMe3)2[Cr(CO)5] mit 1, 2-Dibromethan in DME entstehen die rubinroten Kristalle der Titelverbindung 1. Die Struktur von 1 folgt aus der Untersuchung der 31P-NMR-Spektren und der Einkristallstrukturbestimmung. 1 kristallisiert in der Raumgruppe P1 (Nr. 2); a = 1 307,8(5) pm. b = 1373,1(5) pm, c = 1236, 1(4) pm, α = 106,22(4)°, β = 88,00(3)°, γ = 115,52(4)° mit Z = 1. 1 bildet ein Salz aus einem Dianion R2R4′P42 (R = SiMe3, R′ = Cr(CO)5) und solvatisierten Li+-Kationen. Das gewinkelte Dianion hat die Symmetrie 1-C1. Die Abstände d(P—P) = 202,5(1) pm und (d)P—P = 221,9(1) pm entsprechen einer Doppelbindung bzw. Einfachbindungen. Die Abstände d (Cr—P) = 251,1(1) pm bzw. 255,3(1) pm sind größer als bisher beobachtete, was auf die Ladungsverteilung im Anion zurückgeführt wird.
    Additional Material: 2 Ill.
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