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Showing 1 to 20 of 20 for “"Methyl Vinyl Ketone"”.
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Cycloaddition-fragmentation mediated pathways to ring D modified 19-norsteroids
… The approach is based on cycloaddition of methyl vinyl ketone to 3-methoxyestra-1,3,5(10),14,16-pentaen-17-yl acetate which proceeded with a high degree of regio- and stereoselectivity to give 16α-acetyl-3-methoxy-14, 17α-ethenoestra-1 ,3,5(1 O)-trien-17β-yl acetate. The cycloadduct …
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Synthetic studies on Canangone and beta-Chamigrene
… in only four steps. The Diels-Alder reaction 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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The Total Synthesis of (-)-Prezizaene, (-)-Prezizanol, and Other Perzizanoid Sesquiterpenes
… (-)-Georgeone and (-)-georgeol containing a C-6 methyl group were formed by pinacolic rearrangement of a 3a,6-ethanoindene-diol. Favorskii rearrangement of (+)-pulegone and ozonolysis furnished ethyl 5-methyl-2-oxo-cyclopentane carboxylate which was annelated with methyl vinyl ketone to give a …
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Mass spectrometric investigation of the OH induced oxidation of isoprene using 0 2 + as a chemical ionization reagent
Isoprene (2-methyl-1,3-butadiene) is a dominant non-methane organic compound emitted into the atmosphere by vegetation, with an annual global emission rate of 500 Tg/yr. It represents almost 50% of all biogenic non-methane hydrocarbons on a global scale. It has a substantial impact on troposphere …
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Green chemistry : dense carbon dioxide and water as environmentally benign reaction media
… the cycloaddition between cyclopentadiene and methyl vinyl ketone (MVK) was studied in an scCO₂/liquid water environment. Nitrogen chemistry, specifically the synthesis of nitrogen heterocycles from amines, was also studied in scCO₂ and scCO₂/liquid water systems. The objective of studying the …
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Synthesis of thromboxane A2 analogues.
… Three thromboxane A2 analogues were synthesized, methyl 7-[-5-(3-hydroxy-1-(E)-octenyl)-2-methylbicyclo[3.3.1]non-2-en-9-yl]-[syn]-(+/-)-5-(Z)-heptenoate, methyl 7-[-5-(hydroxy-1-(E)-octenyl)-2,2-dimethylbicyclo[3.3.1]non-9-yl]-[syn]-(-+)-5-(Z)-heptenoate and methyl …
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Ruthenium Hydride Catalyzed Silylvinylation of Alkynes
… acceptors is described. This approach utilizes a vinyl silicon tether to provide complete regiocontrol, a stereoselective anti-exo-dig cyclization which affords a tetrasubstituted olefin with a new vinylsilane, and a highly functionalized Z,E diene motif. Subsequent studies for a highly selective …
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Ruthenium-Catalyzed Transformations for the Synthesis of Conjugated Dienes
… </p> <p> The development of the trans-silylvinylation of internal alkynes with acrylates and vinyl boronates to form conjugated dienes is discussed. This transformation was accomplished via a recently developed tandem silylative coupling using RuHCl(CO)(PCy3)2. The reaction optimization, …
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Part I: The Study Of 2-Aryl-1,3-Dithiane Derivatives As Pronucleophiles In Palladium-Catalyzed Allylic Alkylation And Propellylation Part Ii: Ligand-Free Palladium-Catalyzed Allylic Amintion Of Hydrazone Derivatives Part Iii: Synthesis Of Criegee Intermediate Precursors
… to access skeletally diverse aryl alkyl ketone cores. Allylic carbonate and [1.1.1]propellane electrophiles successfully couple with in situ generated 2-sodio-1,3-dithiane nucleophiles to afford the corresponding products in good to excellent yields. Deprotection of these products leads …
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Novel chiral phosphonium ionic liquids as solvents and catalysts for cycloadditions. Investigation of the Diels-Alder reaction of a series of dienes and dienophiles in novel chiral phosphonium ionic liquids.
… of dienes (cyclopentadiene, isoprene, 2,3-dimethylbuta-1,3-diene, furan, pyrrole, N-methyl pyrrole) and dienophiles (methyl acrylate, methyl vinyl ketone, acrylonitrile, dimethyl maleate, acrolein, dimethylacetylene dicarboxylate, maleic anhydride and maleimide). Investigation of the effect …
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Electronic Spectroscopy, Photochemistry, And Reactivity Of Isoprene-Derived Criegee Intermediates
… intermediates: formaldehyde oxide (CH2OO), methyl vinyl ketone oxide (MVK-oxide), and methacrolein oxide (MACR-oxide). Due to the abundance of isoprene in the atmosphere, the unimolecular and bimolecular reactions of Criegee intermediates may significantly impact the composition of the …
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Design and synthesis of rotational analogues of estradiol
… this diene were explored. The first entailed the vinylogous Shapiro elimination of the tosylhydrazone of 3-methoxyestra-1,3,5(10),15-tetraen-17-one to give the 14,16-diene. The second involved conversion of 3-methoxyestra1,3,5(10), 15-tetraen-17-one into the corresponding dienyl triflate, followed …
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Chemistry and properties of perhydrobenzo[4.5.6]cholestanes
… an optimised yield from the 3Pacetoacetoxy-i:4-6-ketone 71. The key steps in the transformation involved base-treatment of the 3P-acetoacetoxy enoneto give (2R)-2-(3P-hydroxy-6-oxo-5P-cholestan-4p-yl)-3- oxobutanoic acid 1,3'-lactone 79, which was followed by_lactone cleavage, decarboxylation and …
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Novel Photochemical Methodologies for Diversity Oriented Synthesis and Screening of Combinatorial Libraries
… a conformationally unconstrained or "flexible" methyl group based on the <em>Diels-Alder</em> adducts of cyclohexadiene or cyclopentadiene with methyl vinyl ketone. Upon addition of an acid, the expected oxametathesis occurred with results similar to those observed in the aromatic series proving …
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Preparation and reactions of some organic derivatives of manganese carbonyl compounds
New orthomanganated aryl ketones of type 1 (Figure 1) have been prepared, including some in which the donor ketone carbonyl group is incorporated into a fused ring. Analogous derivatives of benzoates and heteroaromatic carboxylic acid esters are also described, together with several orthorheniated …
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Some chemistry of orthomanganated ketones
… and reactions of orthomanganated aromatic ketones, such as (1), diagram. Among the new species characterised are substituted acetophenones, analogues of (1), namely: 3,4,5-trimethoxy (3); 4,5,6-trimethoxy (4); 3-t-butyldimethylsiloxy-4,5-dimethoxy (5); 4,5-dimethoxy (6); 5,6-dimethoxy (7); …
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The Chemistry of Cycloaurated Complexes
… and catalytic activity (in the addition of 2-methylfuran to methyl vinyl ketone) of selected complexes was evaluated. New complexes reported in this thesis where fully characterised by NMR (¹H, ¹³C and ³¹P when appropriate) and IR spectroscopy, ESI-mass spectrometry and elemental analysis. The …
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Detectability of biosignature gases in the atmospheres of terrestrial exoplanets
… database: oxygen, ozone, methane, nitrous oxide, methyl bromide, methyl chloride, hydrogen sulfide, carbonyl sulfide, phosphine, and sulfur dioxide. The deep investigation of the HITRAN biosignature gases in this study is possible due to the ability to properly map their absorption cross sections …
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Organic synthesis in suppercritical carbon dioxide
… effects were explored using the reaction of methyl vinyl ketone and penta-1,3-diene. Pressure did not affect the selectivity; however, it had a large effect on the yield of the reaction. This was discovered to be caused by the change in phase partitioning of the reactants between the fluid …