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  • 1990-1994  (2)
  • 1991  (2)
  • Chemistry  (2)
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  • 1990-1994  (2)
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  • Chemistry  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Two new syntheses of the “phospha-wittig” reagentsThis paper is dedicate to Professor Dr. Rolf Appel on the occasion of his 70th birthday. (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Heteroatom Chemistry 2 (1991), S. 277-281 
    Details
    ISSN: 1042-7163
    Keywords: Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The secondary phosphorylphosphane complexes used in the synthesis of phosphaalkene complexes from carbonyl compounds by the so-called „phospha-Wittig“ reaction can be obtained by two routes. In the first one, a primary lithiophosphine complex is condensed with a chlorophosphite. The resulting P—P compound is oxidized at the free phosphorus by 3-chloroperbenzoic acid. In the second one, bis(phosphoryl)phosphane complexes are allowed to react with sodium methylate in methanol or with water. One of the two P—P bonds of the starting produt is thus cleaved to give the „phospha-Wittig“ reagent. Both routes give better yields and are less sensitive to steric hindrance than the previously described method.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hc.520020209
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Stereochemistry and some synthetic uses of the heteroarylation of phospholesDedicated to Marianne Baudler on the occasion of her seventieth birthday. (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Heteroatom Chemistry 2 (1991), S. 377-383 
    Details
    ISSN: 1042-7163
    Keywords: Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Further studies have been conducted on the condensation of electron-rich arenes or heteroarenes with the dienic system of phosphole P-complexes. According to the X-ray crystal structure analysis of one of the resulting 2-aryl-3-phospholene P-complexes, the condensation takes place on the side of the diene opposite to the complexing group. The decomplexation of the phospholene P-Mo(CO)5 and P-W(CO)5 complexes, respectively, by reaction with sulfur or halogens and tertiary amines yields the corresponding P-sulfides and oxides with full retention of the stereochemistry at phosphorus. Double condensation of the phosphole P-complexes onto the 2 and 5 positions of thiophene and furan ultimately leads to phosphole-thiophene-phosphole and phosphole-furan-phosphole chains. The first type has been characterized by X-ray crystal structure analysis of its P,P-disulfide. No electronic delocalization appears to take place along the chain.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hc.520020305
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    Paper (German National Licenses)
    Fulltext
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