etd AT Indian Institute of Science: Recent submissions
Now showing items 1101-1120 of 9462
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Studies in sesquiterpenes
The present thesis, entitled “Studies in Sesquiterpenes,” consists of four parts, which are suitably subdivided into chapters. PART I — Introduction This part is introductory in treatment and gives a broad survey, with ... -
Studies on the chemistry of isomeric pyridine monocarboxylic acids, their amides and their chlorethanol and N-substitued amino-ethanol easters
The thesis comprises five parts and a General Introduction, each part being treated under three heads, viz. (1) Special Introduction, (2) Experimental, and (3) Summary. The General Introduction deals with the importance ... -
Theoretical studies of electronic effects on structure and reactivity of highly unsaturated organic systems
The thesis entitled “Theoretical Studies of Electronic Effects on Structure and Reactivity of Highly Unsaturated Organic Systems” involves the elucidation of molecular and electronic structures, energetics, and reactivity ... -
Theoretical studies of structural and electronic effects in organic reactions
The thesis entitled “Theoretical Studies of Structural and Electronic Effects in Organic Reactions” involves computational investigations of various factors influencing organic reactivity. Several classes of reactions of ... -
Transformation of C19 and C21 steroids by Mucor Piriformis: studies on the 142 -Hydroxylase system
Abstract not available -
Some novel studies in stereochemistry
The thesis entitled “Some Novel Studies in Stereochemistry” describes, in five chapters, studies aimed at developing novel methodologies in organic asymmetric synthesis, clarifying the mechanism of formation of the interesting ... -
Synthesis of bridged and spiro systems employing 3-exo and 5-exo radical cyclisation reactions
The first few examples of exclusive formation of cyclopropane from homoallyl bromides via a 3-exo-trig radical cyclisation reaction are described in this chapter. Synthesis of chiral tricyclo[3.2.1.0²,?]octanes, starting ... -
Selective in photoreactions in cyclodextrin media
The cyclodextrins (?, ? and ?) are known to form inclusion complexes with organic substrates and thus provide a microheterogeneous reaction medium for the substrates in aqueous solutions. Alternately, cyclodextrin complexes ... -
Strategies of synthesis based on methoxyclohexadienes: synthesis of some polyketides
The thesis entitled “STRATEGIES OF SYNTHESIS BASED ON METHOXYCYCLOHEXADIENES: SYNTHESIS OF SOME POLYKETIDES” consists of two chapters. The first chapter deals with a general introduction to the thesis and is divided into ... -
Theoretical studies on Electronic effects in organic molecules and reactive intermediates
MNDO calculations on a number of model systems reveal the electronic origin of the remarkable acceleration in the Cope rearrangement of a tetracyclic molecule in acidic medium. The methodology was first established to be ... -
Studies in heterocyclic and organomercury chemistry
The subject of the following studies is the synthetic and mechanistic chemistry of certain heterocyclic and organomercury compounds. The thesis entitled “STUDIES IN HETEROCYCLIC AND ORGANOMERCURY CHEMISTRY” is divided into ... -
X-ray crystallographic investigations on polarized twisted ethylenes
The thesis entitled “X-ray crystallographic investigations on polarized twisted ethylenes” deals mainly with the studies carried out by the candidate on the details of molecular geometry and conformation of six push–pull ... -
Sterol aide chain cleavage by micro-organisms
Isolation, maintenance and identification of microorganisms are described. A novel method of strain selection is adopted using a model compound isooctylcyclopentane (I). Garden soil was treated first with cholesterol ... -
X-ray crystallographic investigation of strained small rings and some photoreactive coumarins
The thesis entitled, “X?ray Crystallographic Investigations of Strained Small Rings and Some Photoreactive Coumarins” has been divided into two parts. Part I deals with the structural investigations of four cyclopropane ... -
Synthetic and physicochemical studies in the aza-hetroaroamtics and amonoiminipropenes
This thesis entitled, "Synthetic and Physico?chemical Studies in the Aza?heteroaromatics and Aminoiminiopropenes" consists of descriptions of methods leading to the formation of 2,6?disubstituted?7?nitroindazoles via a ... -
Crystals and molecular structures
The thesis entitled “The Crystal and Molecular Structures of Push–Pull Ethylenes” deals with the structure and conformation of eight push–pull ethylenes. Ethylenes substituted with electron?donating and electron?accepting ... -
Synthetic investigations on the degradation product of bile acids
She thesis consists of two parts, Part I After introducing the importance of Wieland’s tricarboxylic acid (obtained by the degradation of bile acids), in the elucidation of their structures, the synthesis of the gross structure ... -
Synthetic studies in B-Nonsteroids
Chapter I Describes the objectives of the present work. Chapter II Embodies the syntheses of the key intermediates for the synthesis of several B-norsteroids: (i) 4,7-dimethoxy-3,3-dimethylindanone (2.1), (ii) ... -
Physicochemical interactions in synthetic templates
This thesis entitled “physicochemical interactions on synthetic templates” is divided into three sections. Since the unifying theme of the work is the use of affinity chromatographic techniques for the purification of ...