Log in

Relevant bibliographies by topics / Pentadiene-2

Contents

Journal articles
Dissertations / Theses
Book chapters

Academic literature on the topic 'Pentadiene-2'

Author: Grafiati

Published: 2 July 2021

Last updated: 8 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Pentadiene-2.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Pentadiene-2"

1

Werstiuk, Nick Henry, George Timmins, Jiangong Ma, and Timothy A. Wildman. "Computational and ultraviolet photoelectron spectroscopic evidence that (Z)-2-methyl-1,3-pentadiene prefers twisted s-cis conformers in the gas phase." Canadian Journal of Chemistry 70, no. 7 (July 1, 1992): 1971–77. http://dx.doi.org/10.1139/v92-247.

Full text

Abstract:

A redetermination of the ultraviolet photoelectron (pe) spectrum of (Z)-2-methyl-1,3-pentadiene has led to a correction of the published spectrum. By studying (Z)-2-methyl-1,3,-pentadiene (1a) and (E)-2-methyl-1,3-pentadiene (1b) with MMX, MNDO, AM1, and abinitio MO computational methods and pe spectroscopy, we have shown that a combination of these methods provides useful insights on the conformational behaviour of methyl-substituted 1,3-dienes in the gas phase. Synthetic pe spectra, derived from the computed potential energy surfaces and angle-dependent orbital energies, are in good agreement with experiment. Thus, the E isomer prefers the s-trans conformer but the Z isomer prefers twisted s-cis conformations in the gas phase.

APA, Harvard, Vancouver, ISO, and other styles

2

Haken, J. K. "New synthesis of 2-methyl-1,3-pentadiene." Journal of Applied Chemistry 14, no. 4 (May 4, 2007): 174–75. http://dx.doi.org/10.1002/jctb.5010140405.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Kumar, Gaurav, Dongxia Liu, Dandan Xu, Limin Ren, Michael Tsapatsis, and Paul J. Dauenhauer. "Dehydra-decyclization of 2-methyltetrahydrofuran to pentadienes on boron-containing zeolites." Green Chemistry 22, no. 13 (2020): 4147–60. http://dx.doi.org/10.1039/d0gc00136h.

Full text

Abstract:

1,3-Pentadiene (piperylene) is an important monomer in the manufacturing of adhesives, plastics, and resins. This study utilizes fundamental insights gained from the dehydra-decyclization of biomass-derived 2-methyltetrahydrofuran to achieve high piperylene yields.

APA, Harvard, Vancouver, ISO, and other styles

4

MISRA, NAVNIT K., DEEPTI KAPOOR, POONAM TANDON, and V. D. GUPTA. "Phonon Dispersion in 1,4-cis-Poly-(2-Methyl-1,3-Pentadiene)." Journal of Macromolecular Science, Part B 39, no. 1 (January 19, 2000): 39–51. http://dx.doi.org/10.1081/mb-100100370.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Duhaime, Randy M., and Alan C. Weedon. "Direct observation of dienols produced by photochemical enolisation of α,β-unsaturated ketones: rates and activation parameters for dienol reketonisation via a 1,5-hydrogen shift." Canadian Journal of Chemistry 65, no. 8 (August 1, 1987): 1867–72. http://dx.doi.org/10.1139/v87-313.

Full text

Abstract:

The production of stable solutions of Z-dienols by ultraviolet light irradiation of α,β-unsaturated ketones at low temperatures (ca. −76 °C) in d4-methanol is reported. The rates of reketonisation of the dienols via a 1,5-sigmatropic hydrogen shift were determined at various temperatures between −43 °C and + 2 °C by monitoring the proton nmr spectra of the dienols. From the data the activation parameters for the reaction were calculated. For the dienol Z-2-hydroxy-4-methyl-2,4-pentadiene, 2, derived from photoenolisation of 4-methyl-3-penten-2-one, 1, the activation energy from the Arrhenius plot is 62 ± 4 kJ/mol, and the activation entropy and enthalpy from the Eyring plot are −87 ± 15 J/mol K and 60 ± 4 kJ/mol, respectively. For the dienol Z-4-tert-butyl-2-hydroxy-2,4-pentadiene, 4, obtained from photoenolisation of 4,5,5-trimethyl-3-hexen-2-one, 3, the activation energy, entropy, and enthalpy were found to be 47 ± 5 kJ/mol, −135 ± 19 J/mol K, and 45 ± 5 kJ/mol, respectively.

APA, Harvard, Vancouver, ISO, and other styles

6

Arnold, Donald R., Kimberly A. McManus, and Mary S. W. Chan. "Photochemical nucleophile–olefin combination, aromatic substitution (photo-NOCAS) reaction, Part 13. The scope and limitations of the reaction with cyanide anion as the nucleophile." Canadian Journal of Chemistry 75, no. 8 (August 1, 1997): 1055–75. http://dx.doi.org/10.1139/v97-126.

Full text

Abstract:

The scope of the photochemical nucleophile–olefin combination, aromatic substitution (photo-NOCAS) reaction has been extended to include cyanide anion as the nucleophile. Highest yields of adducts were obtained when the alkene or diene has an oxidation potential less than ca. 1.5 V (SCE). No adducts were obtained from 2-methylpropene (9), oxidation potential 2.6 V. Oxidation of cyanide anion, by the radical cation of the alkene or diene, can compete with the combination. With the alkenes, 2,3-dimethyl-2-butene (2) and 2-methyl-2-butene (10), both nitriles and isonitriles were obtained; isonitriles were not detected from the reactions involving the dienes, 2-methyl-1,3-butadiene (11), 2,3-dimethyl-1,3-butadiene (12), 4-methyl-1,3-pentadiene (13), 2,4-dimethyl-1,3-pentadiene (14), and 2,5-dimethyl-2,4-hexadiene (6). The specificity, nitrile versus isonitrile, is explained in terms of the Hard-Soft-Acid-Base (HSAB) principle. The photo-NOCAS reaction also occurs with the allene, 2,4-dimethyl-2,3-pentadiene (15), cyanide combining at the central carbon. Factors influencing the regiochemistry of the combination step, Markovnikov versus anti-Markovnikov, have been defined. Cyanide anion adds preferentially to the less alkyl-substituted, less sterically hindered, end of an unsymmetric alkene or conjugated diene radical cation, forming the more heavily alkyl-substituted radical intermediate. High-level abinitio molecular orbital calculations (MP2/6-31G*//HF/6-31G*) have been used to determine the effect of alkyl substitution on the stability of the intermediates, β-cyano and β-isocyano alkyl radicals, and products, alkyl cyanides and isocyanides. The more heavily alkyl-substituted radical is not necessarily the more stable. The product ratio (Markovnikov versus anti-Markovnikov) must be kinetically controlled. Keywords: photochemistry, radical ions, electron transfer, nitriles, isonitriles.

APA, Harvard, Vancouver, ISO, and other styles

7

Leone, Giuseppe, Antonella Caterina Boccia, Giovanni Ricci, Antonino Giarrusso, and Lido Porri. "Polymerization of (E)-1,3-Pentadiene and (E)-2-methyl-1,3-pentadiene with neodymium catalysts: Examination of the factors that affect the stereoselectivity." Journal of Polymer Science Part A: Polymer Chemistry 51, no. 15 (April 29, 2013): 3227–32. http://dx.doi.org/10.1002/pola.26714.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Arnold, Donald R., Mary S. W. Chan, and Kimberly A. McManus. "Photochemical nucleophile–olefin combination, aromatic substitution (photo-NOCAS) reaction, Part 12. Factors controlling the regiochemistry of the reaction with alcohol as the nucleophile." Canadian Journal of Chemistry 74, no. 11 (November 1, 1996): 2143–66. http://dx.doi.org/10.1139/v96-243.

Full text

Abstract:

The photo-NOCAS reaction that combines methanol, serving as the nucleophile, and the radical cation of 4-methyl-1,3-pentadiene (14+•), substituting on the 1,4-dicyanobenzene radical anion (1−•), yields (E)-1-(4-cyanophenyl)-4-methoxy-4-methyl-2-pentene (15) as the major product. This regioisomer arises from bonding of methanol to C-4, the more heavily alkyl-substituted carbon of the diene, giving the less alkyl-substituted allylic radical. All previous examples of the photo-NOCAS reaction have yielded major adduct(s) having regiochemistry consistent with the anti-Markovnikov rule; the more heavily substituted (more stable?) β-alkoxyalkyl radical was the predominant intermediate. Empirically derived heats of formation and high-level ab initio molecular orbital calculations (MP2/6-31G*//HF/6-31G*) provide convincing evidence that of the two alternative allylic radicals, generated upon addition of methanol to 14+•, that which has the more alkyl substituted allylic radical moiety is, in fact, not the more stable. Of course, the total structure of the intermediate must be considered; the stabilizing effect of alkyl substitution on the carbon next to the oxygen of the ether moiety cannot be ignored. Ab initio molecular orbital calculations (MP2/6-31G*//HF/6-31G*) are reported for the radical cations of 2-methylpropene (2+•), 2-methyl-2-butene (6+•), 2-methyl-1,3-butadiene (9+•), 4-methyl-1,3-pentadiene (14+•), and 2,4-dimethyl-1,3-pentadiene (18+•) Calculations were also carried out on possible intermediates (bridged radical cations, distonic radical cations, and β-alkoxyalkyl radicals) involved upon reaction of these radical cations with methanol. Results of these calculations provide a basis for explaining/predicting the regiochemistry of the photo-NOCAS reaction involving methanol as the nucleophile: the major adduct(s) result(s) from attachment of methanol to that end of the alkene or diene which gives rise to the more stable intermediate radical. The more stable radical is not necessarily the more heavily alkyl substituted. Key words: photoinduced electron transfer, radicals, radical cations, ab initio molecular orbital calculations.

APA, Harvard, Vancouver, ISO, and other styles

9

Werstiuk, Nick Henry, and George Timmins. "A redetermination of the ultraviolet photoelectron spectrum of (Z)-2-methyl-1,3-pentadiene; evidence that twisted conformers predominate in the gas phase." Canadian Journal of Chemistry 66, no. 11 (November 1, 1988): 2954–56. http://dx.doi.org/10.1139/v88-456.

Full text

Abstract:

A redetermination of the ultraviolet photoelectron spectrum of (Z)-2-methyl-1,3-pentadiene (1a) has resulted in a correction of the spectrum published by Masclet and co-workers. MMX and AM1 calculations on 1a predict that twisted s-cis conformations should be populated preferentially in the gas phase; this is in keeping with the experimentally determined -π−, π+ splitting of 1.55 ± 0.05 eV.

APA, Harvard, Vancouver, ISO, and other styles

10

Liu, Hsing-Jang, and Waiseng Martin Feng. "Trans-2-Diethylphosphoryloxy-1,3-Pentadiene in The Lewis acid Catalyzed Diels-Alder Reaction." Synthetic Communications 16, no. 12 (October 1986): 1485–92. http://dx.doi.org/10.1080/00397918608056399.

Full text

APA, Harvard, Vancouver, ISO, and other styles

More sources

Dissertations / Theses on the topic "Pentadiene-2"

1

Abo, Aly Mohamed. "Étude vibrationnelle de polyènes et polyenals conjugués modèles de chromophores de pigments photosensibles : influence de la méthylation et de la configuration." Paris 6, 1986. http://www.theses.fr/1986PA066380.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Desalegn, Nebiyou. "Kinetic Studies Of The Thermolysis Of 3-Halogenated-4,5-Dihydro-3h-Pyrazoles." Digital Archive @ GSU, 2005. http://digitalarchive.gsu.edu/chemistry_theses/1.

Full text

Abstract:

3-Chloro-4,4,5-trimethyl-3,5-diphenyl-4,5-dihydro-3H-pyrazole (3b) and 3-bromo-4,4,5-trimethyl-3,5-diphenyl-4,5-dihydro-3H-pyrazole (3c) were prepared for the thermolysis project. The thermal decompositions of 3b and 3c were monitored using 1H NMR spectroscopy. Plots of ln (% starting material) vs. time (sec) were linear for at least two half lives and the first order rate constants were determined over at least a 30o temperature range. The relative reactivity was found to be 3c > 3b. The activation parameters determined for the thermal decomposition of the pyrazoline at 150oC were found to be: for 3b &#;H‡ = 33 &#;1.0 kcal/mol, &#;S‡ = -2.4 &#; 0.07eu , k150 0 = 7.34 &#; 0.44 x 10 -5 s-1 ; for 3c &#;H‡ = 30&#;0.2 kcal/mol, &#;S‡ = -6.9 &#;0.03 eu, k150o = 42.3&#;0.7 x 10-5 s-1. Thermal decomposition of 3b both neat and in dibromobenzene (DBB) resulted in the formation of an intermediate 2,3-diphenyl-4-methyl-1,3-pentadiene (8) as a major product and minor isomers of 8. These intermediates then thermally decomposed to 1,1,3-trimethyl-2-phenyl-1H-indene (9) via an acid catalyzed process. In order to gain a mechanistic understanding (ionic vs. radical pathways) of the thermal decomposition of 3b, a product study was conducted in protic solvents. In methanol and ethanol, 3b underwent an ionic reaction (SN1-type) with the solvent to produce 3-methoxy/ethoxy-4,4,5-trimethyl-3,5-diphenyl-4,5-dihydro-3H-pyrazole (3/3d) in good yield. The reaction of 3b with refluxing protic solvents led to the development of new method for the synthesis of alkoxy-4,5-dihydro-3H-pyrazoles which is both safe and efficient.

APA, Harvard, Vancouver, ISO, and other styles

3

Martin-Dexmier, Sophie. "Synthèse et réactivité des fluorovinylsilanes." Paris 6, 1986. http://www.theses.fr/1986PA066319.

Full text

Abstract:

Synthèse des difluorovinyl silanes. Mise au point d'une des meilleures voies d'accès aux composés suivants : difluoro-1,2 alcènes, chloro-1 fluoro-2 alcènes, alcènes difluorés substitués et cétones alpha, beta -éthyléniques alpha, beta -difluorées.

APA, Harvard, Vancouver, ISO, and other styles

4

Ferroud, Clotilde. "Étude de la réaction de Diels-Adler intra et intermoléculaire sous haute pression : application à la synthèse stéréosélective d'alcaloïdes de l'indole du groupe des yohimbanes." Paris 6, 1986. http://www.theses.fr/1986PA066023.

Full text

Abstract:

Le schéma de synthèse repose sur une unité bicyclique, précurseur direct des unités (d,e) du squelette pentacyclique. Cet intermédiaire est basé sur une réaction de Diels-Alder sous haute pression, utilisant la cycloaddition de diènes de structure donneur-accepteur 1,4 avec une lactone insaturée comme diénophile. La synthèse du système pentacyclique est exposée à partir de cet intermédiaire clé.

APA, Harvard, Vancouver, ISO, and other styles

5

Tsai, Jeng-fang, and 蔡政芳. "Two Sequential [4+2] Cycloadditions of the Masked 1,5-Disubstituted-3-methylene-1,4-pentadiene in Organic Synthesis." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/03364160472751454830.

Full text

Abstract:

碩士
國立中正大學
化學所
95
1,5-Disubstituent-3-methylene-1,4-pentadiene was prepared by sequential palladium-catalyzed elimination of the allylic acetate. This triene sequentially reacted with dienophile twice to give 1,2,3,4,4a,5,6,7- octahydronaphthalene. A variety of 1,2,3,4,4a,5,6,7- octahydronaphthalenes could be prepared by this methodology.

APA, Harvard, Vancouver, ISO, and other styles

6

Ylijoki, Kai Erik Oskar. "Cobalt-mediated pentadienyl/alkyne [5+2] cycloaddition reactions." Phd thesis, 2010. http://hdl.handle.net/10048/1031.

Full text

Abstract:

Thesis (Ph. D.)--University of Alberta, 2010.
Title from pdf file main screen (viewed on June 25, 2010). A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Doctor of Philosophy, Department of Chemistry, University of Alberta. Includes bibliographical references.

APA, Harvard, Vancouver, ISO, and other styles

7

Yueh, Tsae-Chyi, and 岳彩琦. "Reactions of W-.eta.3-4-methyl-2-carbomethoxyl-pentadienyl compound and application towards organic synthesis." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/98517596111569874952.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Pentadiene-2"

1

Elliott, Gregory P., Nicola M. Mcauley, Warren R. Roper, and Patricia A. Shapley. "An Osmium Containing Benzene Analog, Os(CSCHCHCHC H)(CO)(Pph3 )2 , Carbonyl(5-Thioxo-1, 3-Pentadiene-1, 5-Diyl-C 1 , C 5 , S )-Bis(Triphenylphosphine)Osmium, and its Precursors." In Inorganic Syntheses, 184–89. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132579.ch33.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Pardasani, R. T., and P. Pardasani. "Magnetic properties of 4-methyl-2, 6,7-trioxa-1-phosphabicyclo [2.2.2]octane adduct of half-open, cyclopentadienyl(2, 4-dimethyl pentadienyl)vanadocene." In Magnetic Properties of Paramagnetic Compounds, 660–61. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_320.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Taber, Douglass F. "The Morken Synthesis of (+)-Discodermolide." In Organic Synthesis. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190646165.003.0100.

Full text

Abstract:

The anticancer properties of discodermolide 3 were exciting enough that Novartis undertook a commercial-scale total synthesis. While initial clinical trials were not successful, it is still a very promising lead structure. James P. Morken of Boston College developed (Angew. Chem. Int. Ed. 2014, 53, 9632) a practical approach, based on the Still–Gennari coupling of the phosphonate 1 with the aldehyde 2. The preparation both of 1 and of 2 showed to advantage the diene borylations that have been developed by the Morken group over the past several years. The aldehyde 5 was prepared by enantioselective hydroformation of the protected acrolein 4. Borylation of pentadiene 6 followed by diastereoselective addition to 5 set, after oxidation, the three new stereogenic centers of 7. Ir-catalyzed hydroboration led to the primary alcohol, that was carried through aldehyde deprotection and oxidation to the ester 8. Oxidation of the alcohol to the acid 9 followed by activation with 10 and coupling with the anion 11 then completed the synthesis of 1. The preparation of the key Z-trisubstituted alkene chiron 16 again began with enantioselective hydroformylation of the allyl silyl ether 12 to 13. The addition of 14 proceeded with high diastereoselectivity. Nickel-catalyzed borylation of 15 was also highly diastereoselective, leading to an intermediate that was oxidized to the primary alcohol, then carried on the iodide 16. Pt-catalyzed enantioselective borylation of 6 followed by the addition of chloromethyl lithium led, after oxidation, to the diol 17. Exposure of the derived bis tosylate to potassium t-butoxide led to facile elimination of the homoallylic tosylate. The remaining tosyl protecting group was then removed reductively to give 18. The Roush reductive aldol protocol using the enolate derived from 19 was applied to the derived aldehyde, leading to 20, that was carried on to 21. Under carefully defined conditions, the E-enolate of 21 coupled efficiently with the allylic iodide 17 to give 2. Still–Gennari coupling with 1 to give 22 followed by selective reduction, deprotection, and lactonization then completed the synthesis of (+)-discodermolide 3.

APA, Harvard, Vancouver, ISO, and other styles

4

"The Effect of Ultrasound on the Isomerization versus Reduction Reaction Pathways in the Hydrogenation of 3-Buten-2-ol and 1,4-Pentadien-3-ol on Pd-Black." In Catalysis of Organic Reactions, 327–36. CRC Press, 2005. http://dx.doi.org/10.1201/9781420028034-46.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!