PhD Theses (Mechanical Engineering)

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Browsing PhD Theses (Mechanical Engineering) by Subject "CHEMISTRY"

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    Investigation of bromination reactions using organic ammonium tribromide and their applications towards bioactive natural products synthesis
    (2002) Bose, Gopal
    This dissertation describes the successful and unsuccessful results for the preparation of various a-bromoenones from their corresponding acyclic and cyclic enones using organic ammonium tribromides; synthesis of various ring substituted flavones and aurones (which are structurally isomeric with flavones) from their corresponding 2ं-acetoxychalcones by bromination, followed by cyclisation as well as synthesis of 7-bromoaurones and 8-bromoflavones from 2ं-hydroxychalcones. Chapter 1 of this dissertation includes the review on a-bromoenone, a-bromo-2ं-acetoxychalcone and their applications towards the synthesis of flavone. Chapter 2 in part I describes the results of our successful efforts on the preparation of both acyclic and cyclic a-bromoenones from the corresponding enones in one pot, by bromination using organic ammonium tribromide (OATB), followed by dehydrobromination by employing...