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  • Electronic Resource  (2)
  • Analytical Chemistry and Spectroscopy  (1)
  • phthalic acid  (1)
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  • Electronic Resource  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of chemical crystallography 30 (2000), S. 119-122 
    ISSN: 1572-8854
    Keywords: phthalic acid ; 2, 6-dimethylpyridine ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A new crystal of 2,6-dimethylpyridinium hydrogen phthalate (DPMHP) has been prepared and characterized by x-ray crystallography. DPMHP crystallizes in the monoclinic space group C2/c with a = 26.105(3), b = 8.2250(10), c = 13.8750(10) Å, β = 116.02(1)°, V = 2677.2(5) Å3, and Z = 8. The 2,6-dimethylpyridinium (DPM) is held with the hydrogen phthalate ion (HPI) by intermolecular hydrogen bond of N-H-O. A noncentered hydrogen atom is involved in the short intramolecular hydrogen of O-O [2.398(2) Å] between the neighboring carboxylic groups. The phenyl ring of the HPI appears to be deformed in comparison with the original. The entity of HPI in itself and DMPMHP as a whole are arranged in a rumple pattern. The geometrical arrangement in the crystal structure is characterized by the formation of laminar ribbons of DPMHP.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chemical ionization (CI) of trans- and cis-stilbene and of fumaric and maleic acid, using dichlorocarbene as reagent, was studied. In the CI ion source (CH4), dichlorocarbene added stereospecifically to the double bond of the sample molecule to form the corresponding ion of the 1,1-dichloropropane derivative. From the different relative abundances of the characteristic fragment ions of these cyclopropanes, the geometric configuration of the original substituted olefins may be predicted.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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