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  • 1
    Electronic Resource
    Electronic Resource
    Spezifisch 14C-markiertes 2-Allyl-piperidin (1971)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 1967-1975 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Specifically 14C-Labelled 2-AllylpiperidineThe dehydration of 3-(2-piperidyl)propan-1-ol and of 1-(2-piperidyl)propan-2-ol (1 and 4) was reinvestigated. In each case the major product was 2-propenylpiperidine (5). An unequivocal synthesis of 2-allylpiperidine (3) is reported and the preparation of [2-14C]-3 is described.
    Notes: Die Dehydratisierung von 3-[Piperidyl-(2)]-propanol-(1) und 1-[Piperidyl-(2)]-propanol-(2) (1 bzw. 4) wurde erneut untersucht. In beiden Fällen war 2-Propenyl-piperidin-(5) das Hauptprodukt. Es wird eine eindeutige Synthese von 2-Allyl-piperidin (3) beschrieben, die zur Darstellung von [2-14C]-3 benutzt wurde.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19711040637
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  • 2
    Electronic Resource
    Electronic Resource
    1,2,5-Thiadiazolidin-1,1-dioxid und Homologe (1978)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 1915-1921 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,2,5-Thiadiazolidine 1,1-Dioxide and Homologues1,2,5-Thiadiazolidine 1,1-dioxide (3) was obtained by treating 1,5-di-tert-butyl-1,2,5-thiadiazolidine 1,1-dioxide (9) with trifluoroacetic acid Contrary to 3, the formation of the cyclic sulfamides 6a-c could be achieved simply by reacting sulfamide (1) with tri-, tetra-, or pentamethylenediamine (5a-c), respectively.
    Notes: 1,2,5-Thiadiazolidin-1,1-dioxid (3) wurde aus 1,5-Di-tert-butyl-1,2,5-thiadiazolidin-1,1-dioxid (9) durch Behandlung mit Trifluoressigsäure dargestellt. Im Gegensatz zu 3 lassen sich die cyclischen Sulfamide 6a-c in einfacher Weise durch Umsetzung von Sulfamid (1) mit Tri-, Tetra- bzw. Pentamethylendiamin (5a-c) gewinnen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19781110525
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation of optically active D-arylglycines for use as side chains for semisynthetic penicillins and cephalosporins using immobilized subtilisins in two-phase systems (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 27 (1985), S. 420-433 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Optically active D-arylglycines, which are of interest for preparation of semisynthetic penicillins and cephalosporins, were isolated from the racemic mixtures of their derivatives using immobilized proteolytic enzyme subtilisin (EC No. 3.4.4. 16). The performance of these reactions in two-phase systems, consisting of water and an immiscible organic solvent, improved the yield, purity, and economics of the process by increasing the substrate solubility and reducing the rate of nonenzymatic hydrolysis. The proportion of the organic phase can be as much as 75% of the overall volume without seriously impairing the enzymatic activity. The optically pure D-and L-arylglycines were liberated from their D- and L-derivatives by acid hydrolysis. The substituent influence of the various arylglycine derivatives on the rate of the enzymatic cleavage reaction was investigated.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260270406
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    Paper (German National Licenses)
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