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Showing 1 to 20 of 53 for “"Cyclohexene"”.
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Synthesis and characterization of dirhodium(II) formamidinyl complexes: preliminary studies as catalyst precursors for the allylic oxidation of cyclohexene
… Rh complexes showed that these are active for cyclohexene conversion giving a range of products. Solvent coordination could have an effect on the catalytic behaviour of the complexes, with acetonitrile being the best solvent probably due to the solubility properties of complexes. Under these …
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Structure-reactivity relationships in aluminium alkoxides-catalysed co-polymerisation reactions : aluminium 2,2' methylenebisphenoxide in the synthesis of poly(ether-carbonate)s from cyclohexene oxide and carbon dioxide
Das Design und die Synthese von "Single-Site"-Katalysatoren für die Copolymerisierung von Kohlendioxids und Cyclohexenoxid (CHO), Untersuchungen zu ihrer Struktur-Reaktivitätsbeziehung sowie die Optimierung der Reaktionsparameter waren Hauptaugenmerk dieser Arbeit. Die Liganden für das …
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Triazole-linked reduced amide isosteres: An approach for the fragment-based drug discovery of anti-Alzheimer's BACE1 inhibitors and NH-assisted Fürst-Plattner opening of cyclohexene oxides
… substrate directing moieties in the opening of cyclohexene oxides. We observed that by judicious choice of conditions we could control the regiochemical outcome of the reaction. These studies demonstrate that an intramolecular anilino-NH hydrogen bond donor can direct Fürst-Plattner epoxide …
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ΟΞΕΙΔΩΤΙΚΕΣ ΑΝΤΙΔΡΑΣΕΙΣ ΣΥΜΠΛΟΚΩΝ ΠΑΛΛΑΔΙΟΥ ΕΠΙ ΟΛΕΦΙΝΩΝ
REACTION OF [PDCL2(OLEFIN)]2 (OLEFIN=CYCLOHEXENE, CYCLOOCTENE, CYCLOHEPTENE) WITH PDO2(PPH3)2 GIVES THE CORRESPONDING KETONES AS PRODUCTS. REACTION OF THE SAME OLEFIN COMPLEXES WITH PDO2(PPH3)2 IN THE PRESENCE OF AND HA(HA=TRIFLUOROACETIC AND OR METHANE SULFONIC AND) GIVES CYCLOHEXENONE AND A …
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The adsorption of organic molecules on metal and semiconductor surfaces
… on the adsorption of thiophene, benzene, cyclohexene and cyclohexene molecules using TPD, AES, LEED, XPS, and UPS. The characterisation experiments established that all four molecules are reversibly adsorbed on all the surfaces studied, and more importantly our TPD and UPS data clearly …
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Effects of phosphorus on bond rupture during hydrodeoxygenation and dehydrogenation reactions on ruthenium
… to dehydrogenation catalysts) using Ru(0001). Cyclohexene was used as a probe molecule, and the RMBS of cyclohexene demonstrated that the addition of P atoms enhances the selectivity of cyclohexene dehydrogenation relative to cyclohexene decomposition (i.e., coking) by a factor great than 10 …
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Studies of immobilized homogeneous metal catalysts on silica supports
… reacts with hydrogen fluoride to form cyclohexene. Reaction conditions can be chosen to selectively yield fluorocyclohexane, cyclohexene, benzene, or cyclohexane.;The oxorhenium(V) dithiolate catalyst [-S(CH2)3S-]Re(O)(Me)(PPh 3) was modified by linking it to a tether that could be …
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Selective criteria in Werner clathrates
… and the cyclic hydrocarbons: cyclohexane, cyclohexene, 1,3-cYclohexadiene, 1,4-cyclohexadiene and benzene. Host to guest ratios were elucidated by density and proton nuclear magnetic resonance spectroscopy. The thermal characteristics of the compounds were analysed by thermogravimetric …
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Synthesis and electron spin resonance spectroscopy of organo-sulfur radical cations
… were obtained. For 1,2-bis(isopropylthio)cyclohexene radical cation, the unusually low value of (DELTA)H('(NOT=)) for the cyclohexene ring inversion was explained by secondary interactions between the isopropyl groups and the (alpha) methylene groups. Sulfur-centered radical cations were …
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Photochemical and computational study of sulfoxides, sulfenic esters, and sulfinyl radicals
… are phenol from benzene, cyclohexanol, and cyclohexene from cyclohexane and 2-cyclohexenol and epoxycyclohexane from cyclohexene. A number of experiments designed to elucidate the mechanism of the hydroxylation were carried out, including measurements of quantum yields as a function of …
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Synthesis And Catalytic Studies Of Zinc Complexes Of Amido-Oxazolinate Ligands
… copolymerization of carbon dioxide (CO2) and cyclohexene oxide (CHO), yielding moderate isotactic poly(cyclohexene carbonate) (PCHC) with good to high carbonate linkage and moderate molecular weights and PDI values, depending on the substituents. The asymmetric induction is generally low, with …
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Synthesis, Structure, and Catalytic Activity of Bimetallic Rhodium Complexes in the Hydroformylation and Allylic Oxidation of Alkenes
… catalysts towards the allylic oxidation of cyclohexene. At 0.1 mol% catalyst loading and 3 eq. of TBHP, a near quantitative substrate conversion was observed in the presence of a coordinating solvent, acetonitrile at 82 oC. Under such conditions, the heteroleptic complexes C8 – C11 …
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Synthetic studies on Canangone and beta-Chamigrene
… of methyl vinyl ketone and isoprene gave acetyl cyclohexene and alkylation of this product using prenyl iodide provided the mono alkylated product but unfortunately, attempts to cyclize it failed completely to give the desired spirocyclic compound.
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Entwicklung und Erweiterung von organokatalytischen Domino-Reaktionen
… as catalyst, several examples of trisubstituted cyclohexenecarbaldehydes with yileds between 25-45% and ee between 89-99% were synthesized. The diastereomeric ratio was between 1.4:1 and 3.5:1. Another topic was the expansion of a known triplecascade-reaction. This should be expanded via …
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Isolation and Characterization of Bioactive Metabolites from Endophytic Fungi of Pinus Strobus
… xanthene derivative (9), and one polyoxygenated cyclohexene (10). Two of the dihydrobenzofurans compounds are new (7 and 8), while the other two (5 and 6) are reported here for the first time as natural products. Compound 4 is known as a starting material in the synthesis of fullerenes. The …
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Asymmetrische Organokatalyse zu Alpha-Fluorierung von Aldehyden und Ketonen und zur Synthese von Cyclohexencarbaldehyden via Dominoreaktionen
… and ketones. Furthermore, polyfunctionalized cyclohexene carbaldehydes were synthesized via an organocatalyzed triple cascade creating three new carbon-carbon bonds and up to four new stereocentres with high diastereo- and complete enantiocontrol in one step. This method could be extended by …
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Zeolite encapsulated metal complexes as heterogeneous catalysts for oxidation reactions
… such as such as phenol, benzene, styrene and cyclohexene using a green oxidant (H2O2).For comparison, the corresponding neat complexes were screened as potential homogeneous catalysts for these oxidation reactions. The results proved that the corresponding homogeneous systems described here …
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Alkene oxidation by platinum (II) oxo/hydroxo complexes
… described. Pt-hydroxo complex 4 also reacts with cyclohexene. In this case the reaction takes an allylic C-H activation pathway to produce the cyclohexyl allyl complex [(COD)Pt(C6H9)]+ (55).
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Mechanistic studies of diastereoselective cyclopropanations of homochiral ene-ketals and synthesis and resolution of diastereomeric alpha-hydroxycycloalkanone ketals.
… with a hydrocarbon model system. The effect of cyclohexene ring conformation on the diastereoselectivity was examined for conformationally restricted ene ketal systems. Reagent chelation by the pseudoequatorial dioxolane oxygen atom was shown to be favored. This preference can either antagonize …
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An investigation of the chemistry of lithiotriphenylphosphineacetylmethylene
… lithiotriphenylphosphineacetylmethylene with 2-cyclohexene-1-one gave the 1,2-addition product, although it could not be completely purified. Attempts to form potassiotriphenylphosphineacetylmethylene by means of potassium amide in liquid ammonia gave the unexpected product, …
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