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  1. Article: Exploring the Chemistry of the Mechanical Bond: Synthesis of a [2]Rotaxane through Multicomponent Reactions.

    Saura-Sanmartin, Adrian / Lopez-Sanchez, Jorge / Lopez-Leonardo, Carmen / Pastor, Aurelia / Berna, Jose

    Journal of chemical education

    2023  Volume 100, Issue 9, Page(s) 3355–3363

    Abstract: The synthesis of a [2]rotaxane through three- or five-component coupling reactions has been adapted to an organic chemistry experiment for upper-division students. The experimental procedure addresses the search for the most favorable reaction conditions ...

    Abstract The synthesis of a [2]rotaxane through three- or five-component coupling reactions has been adapted to an organic chemistry experiment for upper-division students. The experimental procedure addresses the search for the most favorable reaction conditions for the synthesis of the interlocked compound, which is obtained in a yield of up to 71%. Moreover, the interlocked nature of the rotaxane is proven by NMR spectroscopy. The content of the sessions has been designed on the basis of a proactive methodology whereby upper-division undergraduate students have a dynamic role. The laboratory experience not only introduces students to the chemistry of the mechanical bond but also reinforces their previous knowledge of basic organic laboratory procedures and their skills with structural elucidation techniques such as NMR and FT-IR spectroscopies. The experiment has been designed in such a customizable way that both experimental procedures and laboratory material can be adapted to a wide range of undergraduate course curricula.
    Language English
    Publishing date 2023-08-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 218164-2
    ISSN 1938-1328 ; 0021-9584
    ISSN (online) 1938-1328
    ISSN 0021-9584
    DOI 10.1021/acs.jchemed.3c00163
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Mechanically Interlocked Profragrances for the Controlled Release of Scents.

    Lopez-Sanchez, Jorge / Alajarin, Mateo / Pastor, Aurelia / Berna, Jose

    The Journal of organic chemistry

    2021  Volume 86, Issue 21, Page(s) 15045–15054

    Abstract: The synthesis of a series of interlocked profragrances and the study of the controlled release of the corresponding scents are reported. The structures of the profragrances are based on a [2]pseudorotaxane scaffold with a fumaramate thread derived from ... ...

    Abstract The synthesis of a series of interlocked profragrances and the study of the controlled release of the corresponding scents are reported. The structures of the profragrances are based on a [2]pseudorotaxane scaffold with a fumaramate thread derived from perfumery alcohols and a tetrabenzylamido ring. The delivery of the scents was accomplished by sequential thermal dethreading and further enzymatic hydrolysis. Alternatively, the dethreading can be achieved by increasing the polarity of the solvent or photochemical isomerization. The temperature of dethreading can be modulated by the steric demand of the ends of the thread, which allows the selection of different precursor structures depending on the desired rates of delivery. The inputs and outputs for the controlled release of the interlocked profragrances correspond to those of YES or AND logic gates.
    MeSH term(s) Delayed-Action Preparations ; Odorants ; Rotaxanes
    Chemical Substances Delayed-Action Preparations ; Rotaxanes
    Language English
    Publishing date 2021-10-01
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 123490-0
    ISSN 1520-6904 ; 0022-3263
    ISSN (online) 1520-6904
    ISSN 0022-3263
    DOI 10.1021/acs.joc.1c01725
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Mechanically Interlocked Profragrances for the Controlled Release of Scents

    Lopez-Sanchez, Jorge / Alajarin, Mateo / Pastor, Aurelia / Berna, Jose

    Journal of organic chemistry. 2021 Oct. 01, v. 86, no. 21

    2021  

    Abstract: The synthesis of a series of interlocked profragrances and the study of the controlled release of the corresponding scents are reported. The structures of the profragrances are based on a [2]pseudorotaxane scaffold with a fumaramate thread derived from ... ...

    Abstract The synthesis of a series of interlocked profragrances and the study of the controlled release of the corresponding scents are reported. The structures of the profragrances are based on a [2]pseudorotaxane scaffold with a fumaramate thread derived from perfumery alcohols and a tetrabenzylamido ring. The delivery of the scents was accomplished by sequential thermal dethreading and further enzymatic hydrolysis. Alternatively, the dethreading can be achieved by increasing the polarity of the solvent or photochemical isomerization. The temperature of dethreading can be modulated by the steric demand of the ends of the thread, which allows the selection of different precursor structures depending on the desired rates of delivery. The inputs and outputs for the controlled release of the interlocked profragrances correspond to those of YES or AND logic gates.
    Keywords enzymatic hydrolysis ; isomerization ; organic chemistry ; perfumes ; photochemistry ; rotaxanes ; solvents ; temperature
    Language English
    Dates of publication 2021-1001
    Size p. 15045-15054.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 123490-0
    ISSN 1520-6904 ; 0022-3263
    ISSN (online) 1520-6904
    ISSN 0022-3263
    DOI 10.1021/acs.joc.1c01725
    Database NAL-Catalogue (AGRICOLA)

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