Jomon Jacob, P; Dr.Prathapan, S(Cochin University of Science And Technology, January 30, 2013)
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Abstract:
the thesis entitled “Ground and Excited
State Electron Transfer Reaction Between a few Anthracene
Appended Tertiary Amines and Suitable Electron Acceptors”
portrays our attempts to explore the solvent, concentration and
temperature effect of the reaction between a few (anthracen-9-
yl)methanamines with electron acceptors like DMAD, DBA and
DBE. We have also studied the effect of solvent and percentage
fluorescence quenching in the photoinduced electron transfer
reactions of these ‘donor-spacer-acceptor’ systems. Finally we
look in to the intramolecular electron transfer reactions of a few
tertiary amine appended dibenzobarrelenes and
bisdibenzobarrelenes
Description:
Department
of Applied Chemistry, Cochin University of Science and Technology
Rekha R mallia; Dr.Prathapan, S(Cochin University of Science and Technology, December , 2007)
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Abstract:
The thesis entitled ‘Studies on the Solvent Dependence in the
Reaction of a Few (Anthracen-9-yl)methylamines and Sulfanes with
Reactive Acetylenes’ is divided into six chapters. ln Chapter l a general
survey of electron transfer reactions, Diels-Alder reactions and Michael-type
additions is presented. A detailed discussion on the synthesis of several
(anthracen-9-yl)methylamines is presented in Chapter 2. In Chapter 3,
results of preliminary photophysical studies on a few (anthracen-9yl)
methylamines are compiled. A detailed discussion on extensive
examination of dependence in the reaction of (anthracen-9-yl)methylamines
with reactive acetylenes is presented Chapter 4. Details on the synthesis and
reaction of a few (anthracen-9-yl)methylsulfanes with DMAD are described in
Chapter 5.
Jean John, Vadakkan; Dr.Prathapan, S(Cochin University of Science & Technology, September , 2002)
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Abstract:
In this thesis, we report our endeavours in the synthesis of a few polycyclic compounds. We were interested in the synthesis of a few bicyclic compounds designed to undergo interesting photochemical transformations including tripletmediated di-π-methane rearrangement and/or competing singlet-mediated electrocyclic reactions. Our target molecules have "inbuilt" structural features which will potentially alter the photochemistry of the substrate under consideration.The present investigation was undertaken to test our hypothesis on selective intramolecular quenching of singlet or triplet excited states of molecules.We adopted Dies-Alder reaction for the synthesis of several of the bicyclic compounds we were interested in. Some of the precursor dienes synthesised by us are capable of undergoing intramolecular cycloaddition reactions as well. So, it was important to delineate the conditions and structural features that will enable a particular molecule to undergo intermolecular and intramolecular Dies-Alder reaction when treated with a suitable dienophile.Though, the main focus of this thesis is on the synthesis of bicyclic and tricyclic systems capable of undergoing di-π-methane rearrangement, in the last chapter of this thesis, we describe our findings on the synthesis of a few dispirocompounds. These systems were encountered as unexpected products in the attempted synthesis of novel dibenzoylalkene-type systems. Consequently, a brief survey on the synthesis and transformations of dibenzoylalkenes is also included as an integral part of this thesis.
Description:
Department of Applied Chemistry, Cochin University of Science and Technology