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Tesi sul tema "Ene reaction chemistry"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 febbraio 2022

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1

Idris, M. S. H. "A study of the ene reactions of 1,2,3-tricarbonyl systems." Thesis, University of Nottingham, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353550.

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2

Dogan, Sengul Dilem. "Regioselectivity In The Ene Reaction Of Singlet Oxygen With Cyclic Alkenes And Application Of Ene Reaction To Stereoselective Synthesis Of Carbaheptopyranose Derivatives." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612648/index.pdf.

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In the first part of this thesis is related to the regioselectivity in ene reaction of singlet oxygen with cyclic alkenes. The photooxygenation of 1-methyl-, 2,3-dimethyl-, 1,4-dimethylcyclohexa-1,4-dienes, 1,2,3,4,5,8-hexahydronaphthalene (16) and 2,3,4,7-tetrahydro-1H-indene (17) which are readily available through Birch reduction, yielded the ene products. The formed endocyclic dienes were trapped by the addition of singlet oxygen to give corresponding bicyclic endoperoxy-hydroperoxides. In the case of 1-methylcyclohexa-1,4-diene (13) and 1,4-dimethyl-cyclohexa-1,4-diene (15), cis-effect de

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3

Alminderej, Fahad Mohammad. "SYNTHESIS AND CHARACTERIZATION OF POLYURETHANE DENDRIMERS SUBSEQUENT CLICK REACTION." Miami University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=miami1469447068.

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4

Marturano, Raffaella. "The kinetics and mechanism of the ene reaction of vinylidene alkenes with maleic anhydride." Thesis, University of Surrey, 2001. http://epubs.surrey.ac.uk/843936/.

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The 'ene' reaction is a pericyclic reaction related to the Diels-Alder reaction. It can be used to synthesise products of commercial importance. An example is its use to attach a 'succinic acid functionality' (via maleic anhydride -MA-), to the ene-terminated polyisobutylene (PIB) to yield PIBSA. While there have been a limited number of studies of the ene reaction, none have concentrated on the reactivity of the vinylidene fragment (CH2-C(=CH2)-CH3) which is found in PIB. In addition there are difficulties in the determination of the kinetics of the PIBSA reaction, because of several competit

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5

Ahuja, Sapna. "Uncovering New Photochemical Pathways Through Molecular Restrictions." Bowling Green State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1594996288079527.

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6

Deon, Daniel. "The effect of DBU on the tandem oxy-Cope/ene reaction and total synthesis of (+)-Arteannuin M." Thesis, University of Ottawa (Canada), 2001. http://hdl.handle.net/10393/9193.

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Tandem reactions have been proven to be powerful methods for creating new types of carbon-carbon bonds in organic synthesis. One such type of reaction is the oxy-Cope/ene reaction of 1,2-divinylcyclohexanols. This reaction has been shown to be a highly diastereoselective method for creating polycyclic compounds with tertiary alcohols at a ring junction. Unfortunately, in many of the previously reported cases, undesired retroene products were also observed.* A new method has been developed that increases the ratio of oxy-Cope/ene with respect to retroene product that involves the use of DBU as

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7

Wutticharoenwong, Kosin. "BIO-BASED REACTIVE DILUENTS AND THIOL-ENE PHOTOPOLYMERIZATION FOR ENVIRONMENTALLY BENIGN COATINGS." University of Akron / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=akron1194282497.

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8

Poudel, Dhruba P. "Late-Stage Modification of Polyurethane Dendrimers Using Click Chemistry." Miami University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=miami1627490978861964.

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9

SUN, HUIKAI. "IRON TRICARBONYL PROMOTED CYCLIZATIONS: POTENTIAL APPLICATION TOWARD TOTAL SYNTHESIS OF 18-DEOXYCYTOCHALASIN H." Case Western Reserve University School of Graduate Studies / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=case1190143838.

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10

Zhurakovskyi, Oleksandr. "Pericyclic and related rearrangements for the synthesis of nitrogen heterocyclic ring systems." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:d7e4bbea-4009-4e7e-838c-46b4bb81bc13.

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The thesis describes synthesis and reactions of allene azides tethered to various functional groups and the application of the discovered cascade transformations towards the synthesis of radianspene J model system. Chapter 1 covers reactions of simple allene azides containing alkyl and cycloalkyl substituents. Thermal rearrangements of these substrates delivered isocyanides and azadienes via the proposed azatrimethylenemethane (ATMM) intermediates. On the other hand, vinylidenecyclopropanes (VDCPs) gave dramatically different products, as described in Chapter 2. A phenyl-substituted VDCP was t

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11

Ramaya, Sharn. "Synthetic studies towards C-glycosyl amino acids : Part I, The synthesis of C-glycosyl amino acids using zinc reagents; Part II, Approaches towards the synthesis of C-glycosyl amino acids using an imino ene reaction." Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390646.

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12

Chen, PoYun. "Role of Ionic Liquid in Electroactive Polymer Electrolyte Membrane for Energy Harvesting and Storage." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1590688110146547.

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13

Somerville, Brian John. "Studies in enantioselective intermolecular ene reactions." Thesis, University of Strathclyde, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366920.

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14

Spilling, Christopher D. "The intramolecular ene reactions of some unsaturated acyloins." Thesis, Loughborough University, 1986. https://dspace.lboro.ac.uk/2134/25592.

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The reaction of 3β-tosyloxy-5α-cholesta-5,6β-diol with potassium t butoxide in t-butanol has been further investigated. 5β-Hydroxy-4,5-secocholest-3-en-6-one was synthesised. It was shown to undergo an ene reaction in decalin in a sealed tube at 200°C to give primarily 3β-methyl-A-nor-5β-cholestan-5-o1 -6-one and 6β-hydroxy-4(5-6α) abeo-cholestan-5-one. These primary products were further modified under the reaction conditions to give 3-methyl-B-nor-5β-cholest-2-en-4-one and 5β-cholestan-5-ol-6-one respectively. The cyclohexane analogue, 3-methyl-3-(3-butenyl)-2-hydroxy-cyclohexanl- one was sy

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15

Cheung, Chi Ming. "Intramolecular carbonyl ene reactions towards the synthesis of the paclitaxel CD ring." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268354.

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16

Torrance, Jacqueline. "Novel reactions of ceph-3-ems." Thesis, Abertay University, 1995. https://rke.abertay.ac.uk/en/studentTheses/4c9a614b-0619-42af-869f-bad5a5ae915f.

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Abstract (sommario):

Michael additions and reactions with haloalkanes have demonstrated the synthetic usefulness of the C-2 and C-4 anions in ceph-3-em sulphides and sulphoxides for the formation of a range of novel compounds (A-H). Other compounds prepared from similiar reactions include (I-O). A reverse Michael addition was attempted on the C-4 mono-adducts (M) and (N) and di-adducts (L) and (O). Determination of the configuration of the di-adducts (F) and (I) was accomplished by de-esterification followed by decarboxylation and resulted in the novel ceph-3-em (P). Conversion of (J) and (K) into novel ceph-3-ems

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17

Wilson, Kenneth. "The synthesis and reactions of thienopyridines." Thesis, Abertay University, 1992. https://rke.abertay.ac.uk/en/studentTheses/a399e9f6-e2c3-4dc4-81a8-85aa2e0614e6.

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The synthesis of <i>ortho</i>-halogenated pyridine derivatives (A-D; R = CN, CO<sub>2</sub>Et; R<sub>1</sub> = CN, CO<sub>2</sub>Me, CO<sub>2</sub>Et) containing methylene groups activated by the nitrile or ester functionality is described. Derivatives (A-D) are reacted with carbon disulfide in the presence of base, followed by alkylation with iodomethane, to afford novel thienopyridines (E-H; R = CN, CO<sub>2</sub>Et; R<sub>1</sub> = CN, CO<sub>2</sub>Me, CO<sub>2</sub>Et; X = SMe). Pyridine derivative (B; R = CN) also reacts with phenyl isothiocyanate to form thienopyridine (F; R = CN; X = N

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18

Sy, Piecco Kurt Waldo. "Chemically-Patterned Substrates via Sequential Photoinitiated Thiol-ene Reactions asTemplates for the Deposition of Molecules and Materials on Surfaces." Ohio University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1553174280949411.

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19

Kim, Hoon. "END-GROUP FUNCTIONALIZATION OF ANIONICALLY SYNTHESIZED POLYMERS VIA HYDROSILATION REACTIONS." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1138024891.

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20

Zarafshani, Zoya. "Chain-end functionalization and modification of polymers using modular chemical reactions." Phd thesis, Universität Potsdam, 2012. http://opus.kobv.de/ubp/volltexte/2012/5972/.

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Abstract (sommario):

Taking advantage of ATRP and using functionalized initiators, different functionalities were introduced in both α and ω chain-ends of synthetic polymers. These functionalized polymers could then go through modular synthetic pathways such as click cycloaddition (copper-catalyzed or copper-free) or amidation to couple synthetic polymers to other synthetic polymers, biomolecules or silica monoliths. Using this general strategy and designing these co/polymers so that they are thermoresponsive, yet bioinert and biocompatible with adjustable cloud point values (as it is the case in the present the

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21

Rajapaksa, Naomi Samadara. "I. Stereoselective Construction of Polycyclic Architectures: Enantioselective Catalytic Transannular Ketone-Ene Reactions and an Enantioselective Total Synthesis of (+)-Reserpine II. Synthesis of Chiral Bisthioureas for Anion-Abstraction Catalysis." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:11127.

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The research presented herein explores three aspects of asymmetric catalysis: (1) the development of new catalytic enantioselective reactions, (2) the application of stereoselective catalysis to natural product total synthesis, and (3) the design and synthesis of new chiral catalysts.<br>Chemistry and Chemical Biology

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22

Simerly, Thomas Max. "Immobilized Bis-Indenyl Ligands for Stable and Cost-Effective Metallocene Catalysts of Hydrogenation and Polymerization Reactions." Digital Commons @ East Tennessee State University, 2012. https://dc.etsu.edu/etd/1473.

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Reactions of catalytic hydrogenations and polymerizations are widely used in industry for manufacture of fine chemicals, pharmaceuticals, and plastics. Homogeneous catalysts for the processes that have low stability and their separation is difficult. Therefore, the development of new highly active and stable catalysts for hydrogenations and polymerizations is a necessity. The objective of this research was the development of a strategy for immobilization of heterogeneous metallocene catalysts. First, a methodology of immobilization of bis-indenyl ligands on the surface of mesoporous silica gel

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23

Boo, Hong Kwen. "A-level chemistry students' conceptions and understandings of the nature of chemical reactions and approaches to the learning of chemistry content." Thesis, King's College London (University of London), 1994. https://kclpure.kcl.ac.uk/portal/en/theses/alevel-chemistry-students-conceptions-and-understandings-of-the-nature-of-chemical-reactions-and-approaches-to-the-learning-of-chemistry-content(3055e673-d0f3-400f-b386-2e32f21862c9).html.

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24

Rasheed, Omer. "Aspects of organonitrogen and organosulphur chemistry in synthesis and recognition." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/aspects-of-organonitrogen-and-organosulphur-chemistry-in-synthesis-and-recognition(c5f19156-176a-4110-8518-a70698d79f2f).html.

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Further investigations intending illucidate the mechanism of a newly discovered redox-alkylation reaction of azo dyes are presented. Preliminary results indicate that this reaction most probably proceeds via initial N-alkylation of the anion derived from an alpha-ketohydrazone. An investigation is continued to study the synthesis of macrocycle-carbohydrate-dye hybrids. The development of a modular approach to macrocycle assembly has enabled the synthesis of a library of pyridine-based macrocycles possessing multiple donor sites. A central dye scaffold, prepared from the SNAr reaction between h

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25

Hameed, Ahmed. "Development of chromatographic methods to follow heterogeneous organic chemistry in aerosols." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/development-of-chromatographic-methods-to-follow-heterogeneous-organic-chemistry-in-aerosols(8a646675-d94c-4064-83d0-af11df225ac5).html.

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Atmospheric aldol self-reactions of octanal, heptanal and hexanal in a range of aqueous H2SO4 w/v% concentrations as a catalyst were studied in both bulk liquid-liquid experiments and gas-liquid experiments. Initially, a new practical methodology was developed and enhanced to monitor aldol reactions in aqueous acidic media. The evaluation of a quenching and extracting method were performed, confirming the suitability, reliability and reproducibility of the extraction method. In bulk studies, aldol products of the three aldehydes were separated and identified by preparative HPLC, GC-MS and NMR.

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26

Twum, Eric Barimah. "Multidimensional NMR Characterization of Polyvinylidene Fluoride (PVDF) and VDF-Based Copolymers and Terpolymers." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1367267597.

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27

Poittevin, Clément. "Réactions de carboalcénylation d'ène-carbamates et d'énamides : recherche de nouveaux processus radicalaires sans étain." Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0037/document.

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Les réactions multicomposants radicalaires sont d’une grande efficacité synthétique et s’avèrent en phase avec les principes de la chimie dite "verte". Ce manuscrit s’articule autour de trois axes : l’étude de la réaction de carbo-alcénylation radicalaire d’oléfines azotées riches en électrons, la valorisation des structures obtenues en se dirigeant vers la synthèse de molécules cycliques ou polycycliques complexes, et pour finir la mise au point de nouveaux médiateurs radicalaires sans étain. Dans un premiers temps, sur la base de travaux antérieurs de notre laboratoire, la réaction de carbo-

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28

Kleinfehn, Alex Patrick. "Scale-Up of Modifiable Poly(propylene fumarate) and Surface Functionalization of Additive Manufactured Scaffolds for Bone Tissue Regeneration." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1562679460809562.

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29

"Mechanistic studies of the intramolecular ene reaction of nitrosocarbonylalkenes." Tulane University, 1992.

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Nitrosocarbonyl compounds are reactive intermediates, which are generated only in situ. Several of these reactive intermediates have been used in natural product syntheses; but, little mechanistic work has been reported. We have generated several of these nitrosocarbonyl compounds in order to study the mechanistic aspects of their intramolecular ene reaction The reactivity of the nitrosocarbonyl compounds have been compared to other systems like singlet oxygen and triazolinediones. Our studies support the fact that the intramolecular ene reactions of nitrosocarbonylalkenes proceed via an analo

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30

Deaton, Melissa Virginia. "A novel ene reaction: Development and applications to the synthesis of (+,-)-phyllanthocin." Thesis, 1996. http://hdl.handle.net/1911/16922.

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A new reaction has been discovered that forms carbon-carbon bonds at room temperature under catalysis by lanthanide reagents. This reaction occurs between vinyl ethers, which have an oxygen functionality located at the central carbon of the allylic system, and aldehydes and is catalyzed by a 1:1 complex of Yb(fod)$\sb3$ and AcOH. The primary product, 3, is not observed but becomes protected, in situ, by excess vinyl ether present as the solvent, or co-solvent, to form the observed product 4. This reaction is very general and proceeds to form pure vinyl ether products in excellent yields. The v

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31

Lovett, Dennis Paul. "A unified approach to mitomycinoids: Application of a novel ene-like reaction." Thesis, 1999. http://hdl.handle.net/1911/19404.

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A practical synthesis of the powerful antitumor agents, mitomycin C and FR900482, remains an elusive goal to this date. These substances may be thought to arise from suitably functionalized benzazocinones as retrosynthetic intermediates. The key to a unified strategy for the synthesis of all mitomycinods is thus a concise, efficient route to a common benzazocenone, which requires appropriate substituents on the aromatic ring as dictated by the specific target molecule. The preparation of medium ring heterocycles of this type is troublesome. The research described herein has been directed towar

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32

Zhu, Shuren. "Application of a novel carbonyl ene reaction: Total syntheses of phyllanthocin and chlorovulone II." Thesis, 1998. http://hdl.handle.net/1911/19334.

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We describe the total syntheses of $(\pm)$-phyllanthocin (1), the aglycon of the potent antineoplastic agent phyllanthoside (2a), and of $(\pm)$-chlorovulone II (3), a halogenated marine prostanoid with high antiproliferative and cytotoxic activity.* The key step of both syntheses is a novel carbonyl ene reaction, which occurs between ordinary aldehydes and vinyl ethers that display the oxygen functionality at the central carbon of an allylic system, e.g., 2-methoxypropene, under the catalytic influence of 0.5 mol% of the 1:1 complex of Yb(fod)$\sb3$ and acetic acid (Figure I).* ftn*Please ref

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33

"Primary hydrogen isotope effect for the ene reaction of singlet oxygen and nitrosocarbonylmethane with electron deficient olefins." Tulane University, 1985.

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Two deuterium-labeled (alpha),(beta)-unsaturated carbonyl compounds, cyclopentylidene cyclopentanone-d(,4) (15-d(,4)) and isopropylidene-(beta)-deutero-(gamma)-butyrolactone-d(,1) (31-d(,1)), were synthesized to determine the isotope effects for the 'ene' reactions of singlet oxygen and nitroso compounds with electron deficient olefins ('1)H-NMR was used to determine both the isotopic purity of 31-d(,1) and the intramolecular isotope effect for the reaction of 31-d(,1) with singlet oxygen and nitrosocarbonylmethane. The photo-oxidation of 31-d(,1) was carried out at -67(DEGREES)C and 25(DEGREE

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34

"Mechanistic studies of the intramolecular ene reaction of nitrosocarbonyl alkenes and progress towards the total synthesis of cinncassiol D1." Tulane University, 1998.

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Ene reactions of singlet oxygen or nitroso compounds with electron-rich olefins have been studied for many years, it is still the subject of controversy. Previous work in our group supported the acylaziridine-N-oxide intermediacy in the intramolecular ene reaction of nitrosocarbonyl alkenes. In part 1, the efforts to prepare the acylaziridine-N-oxides by a different approach have been discussed. A general and efficient process for the synthesis of cyclic iodocarbamates and bicyclic aziridinocarbamates is presented Cinncassiol D1 is a diterpene isolated from the water extracts of Cinnamomum Cas

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35

"Synthesis and reaction chemistry of divalent metal complexes derived from bulky guanidinate ligands." 2013. http://repository.lib.cuhk.edu.hk/en/item/cuhk-1292021.

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Wong, Fai George.<br>Thesis Ph.D. Chinese University of Hong Kong 2013.<br>Includes bibliographical references.<br>Abstracts also in Chinese.<br>Title from PDF title page (viewed on 16, December, 2016).

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36

Chen, Wei-Cheng, and 陳偉政. "(1) The Synthesis and Chemistry of 9-Substituted Bicyclo[6.1.0]non-1(9)-enes ; (2) The Synthesis and Reactions of (E)-3-phenyl-1-[(phenylsulfonyl)imino]-2-propene." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/08933636138787785869.

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碩士<br>輔仁大學<br>化學系<br>88<br>(1) 9-Chlorobicyclo[6.1.0]non-1(9)-ene (75) and 9-bromobicyclo- [6.1.0]non-1(9)-ene (37) were synthesized by dehalo- genation of 9,9-di- bromo-1-chlorobicyclo[6.1.0]nonane (74) and 1,9,9-tribromobicyclo- [6.1.0]nonane (36). Compound 37, an intermediate for the preparation of 9-substituted bicyclo[6.1.0]non-1(9)-enes, underwent bromo-lithium exchange followed by nucleophilic substitution reactions to generate bi- cyclo[6.1.0]non-1(9)-ene (39), 9-methylbicyclo[6.1.0]non- 1(9)-ene (34), and 9-trimethylsilylbicyclo[6.1.0]non-1(9)-ene (98). The bicyclic

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37

HSIAO, FU-CHIN, and 蕭富今. "(1)The mechanism study of the reaction of (E)-3-Phenyl-1-[(phenylsulfonyl)imino]-2-propene with alkyl lithium (2)The Synthesis and Chemistry of 7-Substituted Bicyclo[4.1.0]hept-1(7)-enes." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/59654467214080950712.

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碩士<br>輔仁大學<br>化學系<br>91<br>Abstract (1) When (E)-3-phenyl-1-[(phenylsulfonyl)imino]-2-propene(1) was treated with 2 equivalent methyl lithium(MeLi),five compounds-2, 3, 4, 5, and 6 were isolated. The formation of products 3 and 6 were studied. Compound 2 was treated with 2 equivalent MeLi to produce dianion 25.Dianion 25 underwent intramolecular reaction and reacted with water and deprotonation to generate anion 26 follwed by ring opening and proton absorption to form compound 3. The formation of 6 is via carbanion exchange from methyl carbanion to

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