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  • 1
    ISSN: 0044-2313
    Keywords: Penta-tert-butylundecaphosphane(5) ; 3,5,6,10,11-penta-tert-butyltetracyclo[5.4.0.02,9.04,8]undecaphosphane ; organylpolycyclophosphanes ; configurational isomers of polycyclic phosphanes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Phosphorus. 213. Penta-tert-butylundecaphosphane(5), P11(t-Bu)5 - Preparation and Structure Determination by Nuclear Magnetic ResonancePenta-tert-butylundecaphosphane(5) (1) has been obtained by reacting t-BuPCl2, PCl3, and magnesium and subsequently thermolysing the crude reaction product, and has been isolated in 85% purity. According to NMR spectroscopic investigations, the structure of 1 differs from that of the undecaphosphanes P11R5 with smaller alkyl groups reported previously [2, 3]. The P11(5) skeleton of 1 is derived from the P9(5) skeleton, which is analogous to brexane [2, 17], by condensation of a -P(t-Bu)-P(t-Bu)- bridge. Thus 1 is 3,5,6,10,11-penta-tert-butyltetracyclo[5.4.0.02,9.04,8]undecaphosphane. Compound 1 is formed as a mixture of two configurational isomers 1a and 1b, which differ from each other in their spatial arrangements of the tert-butyl groups on P10 and P11.
    Notes: Penta-tert-butyl-undecaphosphan(5) (1) wurde durch Reaktion von t-BuPCl2, PCl3 und Magnesium und anschließende Thermolyse des Rohproduktes gewonnen und in 85proz. Reinheit isoliert. Nach kernresonanzspektroskopischen Untersuchungen hat 1 eine andere Struktur als die bereits bekannten Undecaphosphane P11R5 mit kleineren Alkylgruppen [2, 3]. Das P11(5)-Gerüst in 1 leitet sich von dem P9(5)-Gerüst mit Brexan-Struktur [2, 17] durch Anfügen einer -P(t-Bu)-P(t-Bu)-Brücke ab. Demnach handelt es sich bei 1 um 3,5,6,10,11-Penta-tert-butyl-tetracyclo[5.4.0.02,9.04,8]undecaphosphan. Verbindung 1 entsteht als Gemisch von zwei Konfigurationsisomeren 1a und 1b, die sich in der räumlichen Anordnung der tert-Butylgruppen an P10 und P11 unterscheiden.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Tetraisopropyloctadecaphosphane(4) ; 8,14,16, 18-tetraorganyloctacyclo[13.2.1.02,13.03,11.04,9.05,7.06,10.012,17]octadecaphosphanes ; organylpolycyclophosphanes ; conjuncto-phosphane skeletons ; octacyclo[13.2.1.02,13.03,11.04,9.05,7.06,10.012,17]octadecaphosphane ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Phosphorus. 219. Tetraisopropyloctadecaphosphane(4), P18i-Pr4  -  Preparation and Structure Determination by Nuclear Magnetic ResonanceTetraisopropyloctadecaphosphane(4) (1) has been obtained by reaction of i-PrPCl2 with P4 and magnesium and subsequent thermolysis of the crude reaction product, and has been isolated in 95% purity. According to NMR-spectroscopic investigations, 1 contains a conjuncto-phosphane skeleton consisting of a P11(5)- and a P9(3)-structural element analogous to that of deltacyclane, joined through a common P2-bridge. Thus, 1 is 8,14,16, 18-tetraisopropyloctacyclo[13.2.1.02,13.03,11.04,9.05,7.06,10.012,17]octadecaphosphane. Compound 1 is formed as a mixture of two configurational isomers 1 a and 1 b, which differ from each other in their spatial arrangements of the isopropyl group at P8.
    Notes: Tetraisopropyl-octadecaphosphan(4) (1) wurde durch Reaktion von i-PrPCl2, P4 und Magnesium und anschließende Thermolyse des Rohproduktes gewonnen und in 95proz. Reinheit isoliert. Nach kernresonanzspektroskopischen Untersuchungen enthält 1 ein Konjunkto-Phosphangerüst aus einem P11(5)-und einem Deltacyclan-analogen P9(3)-Strukturelement, die eine P2-Brücke gemeinsam haben. Demnach handelt es sich bei 1 um 8,14,16,18-Tetraisopropyl-octacyclo[13.2.1.02,13.03,11.04,9.05,7.0 6,10.012,17]octadecaphosphan. Verbindung 1 entsteht als Gemisch von zwei Konfigurationsisomeren 1a und 1b, die sich in der räumlichen Anordnung der Isopropyl-Gruppe an P8 unterscheiden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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