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Home    Ετερογενείς αντιδράσεις οξείδωσης με διεγερμένο οξυγόνο απλής κατάστασης, (Singlet Oxygen) : κυκλοπρόπυλο ανιχνευτές στη μελέτη των μηχανισμών φωτοοξειδώσεων, κυκλοπροσθηκών του τετρακυανοαιθυλενίου (TCNE) και ισομερείωσης εποξειδίων  

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Identifier 000382559
Title Ετερογενείς αντιδράσεις οξείδωσης με διεγερμένο οξυγόνο απλής κατάστασης, (Singlet Oxygen) : κυκλοπρόπυλο ανιχνευτές στη μελέτη των μηχανισμών φωτοοξειδώσεων, κυκλοπροσθηκών του τετρακυανοαιθυλενίου (TCNE) και ισομερείωσης εποξειδίων
Alternative Title Heterogeneous oxidation reactions with excited oxygen, (Singlet Oxygen). Mechanistic studies of photooxidations, tetracyanoethylene cycloadditions to alkenes and isomerization of epoxides by using cyclopropyl probes
Author Παπασταύρου, Αργυρώ
Thesis advisor Ορφανόπουλος, Μιχάλης
Reviewer Βασιλικογιαννάκης, Γεώργιος
Στρατάκης, Εμμανουήλ
Abstract The results of the present master thesis are included in the following four chapters: In the first chapter the preparation of a new heterogeneous catalyst MCM-41/C60 is reported. This form of the catalyst is prepared by the method of simple impregnation in a single step. The activity of the catalyst MCM-41/C60 was examined by the photo oxidation of the alkene 2-methyl-2-heptene in various conditions. The results of this reaction are compared with corresponding results from the previous oxidation catalyst MCM-41/C60 which was prepared by sequential impregnations which is time-consuming method. In the second chapter the mechanism of photooxidation of cyclopropyl substituted alkenes by using three classic photosensitizes namely: a) Tetraphenylporphyrin (TPP), b) 9 10-Dicyanoanthracene (DCA), and c) decatungstate [W10O32]-4, was examined. The first two catalysts gave the ene products whereas the last catalyst (WO), promoted photooxygenations through radical intermediates. In the third chapter the mechanism of the thermal addition of tetracyanoethylene (TCNE) to substituted cyclopropyl-alkenes was studied. All cycloadditions proceeded through a dipolar intermediate. In the fourth chapter the mechanism of the epoxide isomerization to allylic alcohols in the presence of Au/TiO2 catalyst was studied in detail. Under the experimental conditions and the specific substrates the isolated products were mostly cyclic ethers.
Language Greek
Subject Heterogeneous oxidation
Isomerization of epoxides
Photooxidation
TCNE
Ετερογενής κατάλυση
Ισομερισμός εποξειδίων
Τετρακυανοαιθυλένιο
Φωτοοξείδωση
Issue date 2014-02-28
Collection   School/Department--School of Sciences and Engineering--Department of Chemistry--Post-graduate theses
  Type of Work--Post-graduate theses
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