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  • Organic Chemistry  (2)
  • Alkylstannylhydrid  (1)
  • Blutung  (1)
  • Chirurgie.  (1)
  • 1
    ISSN: 1434-4475
    Keywords: Alkylstannylhydrid ; Hydrierung ; Organochlorsilane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Organotinchlorides of the general formula R3SnCl and R2SnCl2 (R=Me,n-Bu, Ph) can easily be converted into the corresponding hydrides R3SiH and R2SiH2 employing NaH in diethylene glycol dialkyl ethers. Using trialkyltinhydrides like Bu3SnH in combination with a catalyst (tertiary amines, N-heterocycles, phosphonium or ammonium salts), Si-Cl bonds in mono- and disilanes are hydrogenated. In the case of disilanes, Si-Si bond cleavage and concurrent hydrogenation can be afforded with strongly nucleophilic catalysts. Partial hydrogenation is also possible. The whole process can be run cyclically.
    Notes: Zusammenfassung Organostannylchloride vom Typ R3SnCl und R2SnCl2 (R=Me,n-Bu, Ph) können in einfacher Weise mit NaH zu den entsprechenden Hydriden R3SnH und R2SnH2 umgesetzt werden, wenn als Lösungsmittel Diethylenglykoldialkylether verwendet werden. Trialkylzinnhydrid wie Bu3SnH können zur Hydrierung von Si-Cl-Bindungen in Mono- und Disilanen eingesetzt werden, wobei in Abhängigkeit vom notwendigen Katalysator (tertiäre Amine, N-Heterocyclen, λ3-Phosphorverbindungen, Ammonium- und Phosphoniumsalze) nur hydriert oder (mit stark nucleophilen Katalysatoren) auch die Si-Si-Bindung gespalten werden kann. Durch Verwendung eines Unterschusses an Bu3SnH können auch gezielt teilhydrierte Produkte erhalten werden. Das Verfahren kann als Kreislaufprozeß geführt werden.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1433-0385
    Keywords: Key words: Pseudocysts ; Hemorrhage ; Pancreatitis ; Transcatheter embolisation ; Surgery. ; Schlüsselwörter: Pseudocysten ; Blutung ; Pankreatitis ; Katheterembolisation ; Chirurgie.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung. Eine akute Blutung aus einer Pseudocyste oder einem Pseudoaneurysma ist eine gefürchtete Komplikation der chronischen Pankreatitis. Während die chirurgische Intervention nach wie vor eine hohe perioperative Letalität aufweist (16,8 %), scheint die zunehmend eingesetzte arterielle Katheterembolisation weniger riskant zu sein (6,1 %). Wir berichten über 6 Patienten mit Pseudocysten oder -aneurysmen an unserer Klinik, von denen 4 primär chirurgisch behandelt, die anderen beiden embolisiert wurden. Bei einem Patienten mußte 10 Tage nach Embolisation zusätzlich laparotomiert werden. Alle Patienten überlebten. Der Vergleich zweier Literaturperioden (von 1951 bis 1981 und von 1982 bis 1996) zeigt, wie wertvoll die arterielle Katheterembolisation zur Senkung der Letalität bei blutenden Pankreaspseudocysten und -aneurysmen ist.
    Notes: Summary. Acute hemorrhage from pseudocysts and pseudoaneurysms is a threatening complication of chronic pancreatitis. Whilst surgical intervention still has high perioperative mortality (16.8 %), transcatheter arterial embolization is becoming more frequently used for suitable cases and appears to have lower mortality (6.1 %). We report on six patients treated in our unit. Four of them underwent primary surgical treatment, the other two were treated by embolisation. One of the latter patients subsequently required laparotomy for further treatment. All six patients survived. Comparing the literature covering the periods between 1951 and 1981 and between 1982 and 1996, transcatheter embolisation seems to be valuable in controlling this type of bleeding, thereby reducing mortality.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The partially diethylamino substituted phenyl-chloromono- and -disilanes Cl2Ph(NEt2)Si(2) Cl2Ph(NEt2)2Si(3), [ClPh(NEt2)Si-]2 (7) and Cl(NEt2)PhSi—SiPh(NEt2)2 (8) were synthesized. 3 and 8 are able to react with lithium powder to form the corresponding silyllithium compounds. The resulting species were characterized in solution by 13C and 29Si NMR spectroscopy. To prove the expected substitution patterns of the silyllithium compounds some coupling reactions with chlorosilanes were carried out and the resulting new oligosilanes were characterized by means of NMR spectroscopy and MS.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 339 (1997), S. 603-606 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preparation and Characterization of Oligomeric as well as Polymeric Ethynylsilanes Containing Si2—Si4 UnitsThe treatment of methylchlorodisilanes with ethynyldigrignard (BrMgC≡CMgBr) resulted in oligomeric as well as polymeric ethynyldisilanes. The kind of this products is related to the chloro functionality of the starting disilane. The reaction of SiClMe(SiCl2Me)2 as well as SiMe(SiCl2Me)3 yielded polymers beside small amounts of the monomeric products (HC≡C)MeSi[SiMe(C≡CH)2]2 and MeSi[SiMe(C≡CH)2]3.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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