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Showing 1 to 20 of 161 for “"diene"”.
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Synthesis of pyrrolizidine diols via azide-diene cycloadditions
… nitrogen atom equivalent and a conjugated diene to afford a pyrroline ring. The flexibility of this strategy was exemplified by the formal synthesis of ring-A oxygenated pyrrolizidine alkaloids platynecine 8, turneforcidine 9, hastanecine 10, and dihydroxyheliotridane 11. The key features …
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Development of three-component alkene and 1,3-diene carbofunctionalization reactions
… allylic amines via a three-component 1,3-diene carboamination reaction. Utilizing many of the principles uncovered while developing the alkene functionalization reactions of the prior chapters, this system facilitates modular access to allylic amines that does not require the manipulation …
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Synthesis of diene ligands with H-bonding capabilities for bioimaging applications
Investigations of the synthesis of novel bioprobes (Scheme A), potentially useful in bioreactions and sugar sensing, are described. A preliminary study is reported that aims to validate the feasibility of tricarbonyl iron complexes and their derivatives in applications as a constituent part of …
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SYNTHESIS OF ALL-CARBON SPIROCYCLES BY INTRAMOLECULAR IRON-MEDIATED DIENE/OLEFIN CYCLOCOUPLING
… double cyclization reaction using cyclohexadiene-Fe(CO)3 with pendant conjugated dienes that are attached via an amide group. Then a novel method was found for the construction of an angular triquinane skeleton by a combination of an iron-promoted tandem double ene-type cyclization followed …
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Structure property behavior of an ethylene-propylene-diene ionic terpolymer containing zinc stearate
… property behavior of an ethylene-propylenediene ionic terpolymer containing varying amounts of ZnSt was investigated. Studies show that ZnSt acts as a reinforcing filler under ambient conditions. Stress-strain behavior, percent relaxation, hysteresis and permanent set were all found to …
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Enantioselective (Formal) Aza-Diels-Alder Reactions with Danishefsky's Diene and Non-Danishefsky Type Dienes
… result, efforts to develop enantioselective diene-imine (aza-Diels-Alder) reactions to efficiently access these substructures have increased. We have developed highly enantioselective silicon Lewis acid mediated formal aza-Diels-Alder reactions with Danishefsky's diene and non-Danishefsky's …
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Microphase Separation Studies in Styrene-Diene Block Copolymer-based Hot-Melt Pressure- Sensitive Adhesives
… the microstructure evolution in styrene — diene block copolymer — based pressure-sensitive adhesive compositions in melt. The work also focuses on determining the microphase separation mechanism in adhesive melts containing various amounts of low molecular weight resin (tackifiers) blended …
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Comparing diene derivatisation methods of dry blood spot samples for vitamin D metabolites quantification by liquid chromatography-tandem mass spectrometry
… with specific focus on PTAD and Amplifex diene reagents (Cooksontype reagents) used in this study. The importance of sensitivity and selectivity of targeted analytes is described first in detail for underivatised analytes, followed by PTAD and Amplifex derivatised samples. Chapter 2 also …
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I. Generation of dibromocarbene under neutral conditions; II. Generation and reactions of 11-carbena[4.4.1]propella-3,8-diene; III. The oxidation of cyclopropylidenes
… of 10,10-dibromotricyclo (4.3.1.0) deca-2,4-diene. Both methods generated:CBr[subscript]2 in good yields, as evidenced by the formation of dibromocyclopropane adducts with olefins like 2-pentene and cyclohexene;In an effort to study whether the tricyclic carbene, 11-carbena (4.4.1) …
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Design and synthesis of rotational analogues of estradiol
… two approaches for the synthesis of 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 …
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Triplex Diels-Alder reactions of beta-methylstyrenes. Density functional investigation of pion-pion interactions
The (4+2) cycloaddition of an electron-rich diene to an electron-rich dienophile may be catalyzed by irradiation of a cyanoarene. This reaction is shown to proceed through an intermediate ternary excited state complex (triplex) and is therefore called the triplex Diels-Alder reaction. Evidence is …
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Studies on the synthesis, cyclodextrin inclusion and biological activity of ajoene analogues as potentially novel anti-cancer agents
… 10-( 4-methoxyphenyl)-4,5,9-trithia-deca- 1 ,6-diene (25) as an ajoene mimic and as a mixture of EIZ-geometrical isomers using new synthetic methodology. 4,5,9-trithia-dodeca-1,6-diene 9-oxide (43), 4,5,9-trithia-dodeca-,6- ene 9-oxide (44) and 2,3,7-trithia-deca-4-ene 7-oxide (45) were also …
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Investigations utilizing mono- and difunctional organo alkali metal initiators for anionic polymerization
… anionic polymerization initiator for primarily diene monomers. The initiator was formed in nonpolar solvent such as cyclohexane and toluene by the addition of two equivalents of sec-butyllithium to one of the nonconjugated diene 1,3-bis(α-phenylethenyl)benzene. The disappearance of the starting …
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The synthesis and use of cyclic nitronic esters
… It was shown that nitroalkenes can behave as the diene component of the cycloaddition with cyclic dienes due to the effect of the Lewis acid. Finally, the selectivity of the intramolecular cycloaddition is highly dependant upon the position of sp$\sp2$ centers in the tether. If that center is …
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