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  • Walter de Gruyter GmbH  (2)
  • 1
    In: Pure and Applied Chemistry, Walter de Gruyter GmbH, Vol. 83, No. 4 ( 2011-3-14), p. 931-1014
    Kurzfassung: This glossary of terms covers phenomena considered under the very wide terms photocatalysis and radiation catalysis . A clear distinction is made between phenomena related to either photochemistry and photocatalysis or radiation chemistry and radiation catalysis. The term “radiation” is used here as embracing electromagnetic radiation of all wavelengths, but in general excluding fast-moving particles. Consistent definitions are given of terms in the areas mentioned above, as well as definitions of the most important parameters used for the quantitative description of the phenomena. Terms related to the up-scaling of photocatalytic processes for industrial applications have been included. This Glossary should be used together with the Glossary of terms used in photochemistry , 3 rd edition, IUPAC Recommendations 2006: (doi:10.1351/pac200779030293) as well as with the IUPAC Compendium of Chemical Terminology , 2 nd ed. (the “Gold Book”, 2006– doi:10.1351/goldbook) because many terms used in photocatalysis are defined in these documents.
    Materialart: Online-Ressource
    ISSN: 1365-3075 , 0033-4545
    RVK:
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2011
    ZDB Id: 2022101-0
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Online-Ressource
    Online-Ressource
    Walter de Gruyter GmbH ; 2022
    In:  Green Processing and Synthesis Vol. 11, No. 1 ( 2022-01-18), p. 96-105
    In: Green Processing and Synthesis, Walter de Gruyter GmbH, Vol. 11, No. 1 ( 2022-01-18), p. 96-105
    Kurzfassung: Cefonicid is a common second-generation cephalosporin, and the 7-amino-3-[sulphomethyl-1- H -tetrazol-5-yl-thiomethyl]-3-cephem-4-carboxylate monosodium salt is a key synthetic intermediate in its preparation. Despite the considerable international demand for this antibiotic, its preparation is hampered by low synthetic yield, long reaction time, and time-consuming industrial filtration over charcoal after the purification step. In the context of the industrial production of pharmaceutical intermediates, in which the balance between streamlining and enhancing productivity is necessary in order to compete in the global active pharmaceutical ingredients (API) market, we have investigated an efficient and practical procedure for the synthesis of a key cefonicid intermediate that features a telescopic route whose synthetic steps are all performed at room temperature; from the displacement of the acetoxy group with boron trifluoride to crystallization without treatment with charcoal. In other words, a simpler, scalable, cost-effective and energy-saving protocol is herein reported as a means of moving towards commercial manufacturing. The optimization of the process parameters and the industrial-scale impact assessment should pave the way for industrialization.
    Materialart: Online-Ressource
    ISSN: 2191-9550
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2022
    ZDB Id: 2645923-1
    Standort Signatur Einschränkungen Verfügbarkeit
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