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  • Superficial palmar arch  (2)
  • Aromaticity  (1)
  • 1995-1999  (3)
  • 1980-1984
  • 1955-1959
  • 1999  (3)
  • 1
    ISSN: 1279-8517
    Keywords: Arteria princeps pollicis ; Superficial palmar arch ; Arteria radialis indicis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Cinq cas d'artères de la première commissure de la main prenant leur origine uniquement sur l'arcade palmaire superficielle sont rapportés. Aucune de ces artères n'était de taille suffisante pour pouvoir être intitulée «artère princeps pollicis». Ces variations doivent être prises en compte dans les dissections chirurgicales de la main.
    Notes: Summary Five cases are described where the first web space of the hand received arteries only from the superficial palmar arch. None of these branches was large enough to deserve the name “princeps pollicis artery”. These variations must be taken into account during surgical dissections of the hand.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1279-8517
    Keywords: Arteria princeps pollicis ; Superficial palmar arch ; Arteria radialis indicis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Five cases are described where the first web space of the hand received arteries only from the superficial palmar arch. None of these branches was large enough to deserve the name “princeps pollicis artery”. These variations must be taken into account during surgical dissections of the hand.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    ISSN: 1434-1948
    Keywords: Phosphorus heterocycles ; Aromaticity ; Phosphenium cations ; Ab initio calculations ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The aromatic stabilization of cyclic phosphenium cations (general type C2N2P+) was studied by experimental methods (synthesis, multinuclear NMR, single crystal X-ray crystallography) and quantum chemical calculations (ab initio methods). The structures of the 1,3,2-diazaphosphole derivatives [(tBuN-CH=CH-NtBu)P+]Cl- (1), (tBuN-CH2-CH2-NtBu)P-Cl (2), [(tBuN-CH=CH-NtBu)P]+PF6- (3) and [(tBuN-CH2-CH2-NtBu)]P+PF6- (4) were examined by single crystal X-ray diffraction. The chloro phosphane [(tBuN-CH=CH-NtBu)P]+Cl- (1) has an ionic P-Cl bond and contains an aromatically stabilized phosphenium cation [shortest distance P···Cl = 275.9(2) pm], while the CC-saturated compound (tBuN-CH2-CH2-NtBu)P-Cl (2) is covalent. The two chloro-phosphanes 1 and 2 differ sharply in their volatility and solubility in organic solvents. Compound 2 is soluble in hydrocarbons and sublimes readily at 90 °C/0.1 Torr but 1 is insoluble in hexanes and not volatile below 180 °C/0.1 Torr. The degree of aromatic stabilization in the phosphenium cation 1 was investigated by ab initio methods. For the model cations [RN-CH2-CH2-NR]P+ and [(RN-CH=CH-NR)P]+, thermochemical stabilization energies of 25.8 kcal · mol-1 (R = H) and 28.1 kcal · mol-1 (R = Me) were obtained from isodesmic hydrogenation reactions at the RHF/MP2/6-31G*//RHF/6-31G* level.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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