• Medientyp: E-Artikel
  • Titel: Reaktive E=C(p – p)π-Systeme, XX [1] / Reactive E=C(p–p)π-Systems, XX [1] : Synthese und Reaktivität der konstitutionsisomeren Perfluorphosphaalkene F3CP=C(F)CF3 und F5C2P=CF2 / Synthesis and Reactivity of the Isomeric Perfluorophosphaalkenes F3CP=C(F)CF3 and F5C2P=CF2 : Synthese und Reaktivität der konstitutionsisomeren Perfluorphosphaalkene F<sub>3</sub>CP
  • Beteiligte: Grobe, Joseph; Hegemann, Marianne; Le Van, Duc
  • Erschienen: Walter de Gruyter GmbH, 1990
  • Erschienen in: Zeitschrift für Naturforschung B, 45 (1990) 2, Seite 148-160
  • Sprache: Englisch
  • DOI: 10.1515/znb-1990-0208
  • ISSN: 1865-7117; 0932-0776
  • Schlagwörter: General Chemistry
  • Entstehung:
  • Anmerkungen:
  • Beschreibung: The vapour phase pyrolysis of the stannylphosphane Me3SnP(CF3)C2F5 (5) at 330 °C leads to 1,2-elimination of Me3SnF yielding a mixture of the two isomeric perfluorophosphaalkenes F3CP=C(F)CF3 (3) and F5C2P=CF2 (4) in a 3:1 molar ratio. 3 is more labile than 4 and proves to be similar to the perfluoro-3-phosphapent-2-ene F5C2P=C(F)CF3 (2) with respect to NMR data and chemical properties. On the other hand 4 resembles the perfluoro-2-phosphapropene F3CP=CF2 (1). These results have been deduced from the following reactivity studies: (i) The rate of dimerization being higher for 3 than for 4. (ii) Reaction of the mixture with diethylamine yielding the aminophosphane derivative F3CP(NEt2)CF(H)CF3 (13) as a product of 3 and the C-aminophosphaalkene F5C2P=C(F)NEt2 (14) as the derivative of 4. (iii) Reaction of the mixture with methanol giving the methoxyphosphane F3CP(OMe)CF(H)CF3 (15) from 3 and the secondary phosphane F5C2P(H)CF2OMe (16) from 4 as precursors. 3 and 4 prove to be effective dienophiles in reactions with 2,3-dimethyl-1,3-butadiene and 1,3-cyclohexadiene, respectively, producing the corresponding Diels-Alder adducts 9 to 12. For these preparations 5 can be used as an equivalent of 3 in a one-pot procedure at 70 °C. On the other hand the phosphane HP(CF3)C2F5 (8) is suited as precursor for 3 in preparing HX addition products.
  • Zugangsstatus: Freier Zugang