Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 8 of 8 for “"Vinylcyclopropane"”.
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Hydrophosphination of Vinylcyclopropane & Quinine for Metal Coordination Chemistry
… one details the UV light-induced ring opening of vinylcyclopropane with primary (RPH2) or secondary (R2PH) phosphines without initiators. The resulting tertiary phosphines were converted into air and moisture stable phosphine sulfides and phosphine oxide. Control experiments suggest these UV …
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Low-temperature vinylcyclopropane rearrangement in the total synthesis of (-) - specionin
… sequence is a low-temperature rearrangement of vinylcyclopropane 59 to diquinanes 61 and 62. Of additional merit is the development of an efficient preparation of enone 56 from cis arene diol 66.
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Development of Palladium-Catalyzed and Iodine-Mediated Formal [4+1] Annulation Protocols. Progress toward a New Fulvene-Based Organocatalytic Platform for Carbonyl α-Functionalization
… followed by a magnesium iodide-mediated vinylcyclopropane-cyclopentene rearrangement. The cyclopropanation makes use of magnesium perchlorate to increase reactivity at the alpha-carbon of the beta-ketoesters. The protocol has been demonstrated to be effective in the annulation of a number …
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[4+1] cyclopentene annulation in the total synthesis of pentalenene type sesquiterpenes
… cyclopropanation of this substance to vinylcyclopropane 163 and the vinylcyclopropane-cyclo pentene rearrangement of several derivatives of 195 to triquinanes 147, 146, 197, and 204. A detailed study of temperature, conformation, and electronic effects on the diradical scission of …
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La transposición N-ciclopropilimina-1-pirrolina
… to 1- pyrrolines which involves a type of aza(vinylcyclopropane-cyclopentene) rearrangement. It has been explored in its photochemical fashion, which constitutes a new reaction not described up to date, as well as the thermal rearrangement, which has been previously explored only in a very …
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Radical anion rearrangements. aryl cyclopropyl ketyl anions
… (66), and 1-benzoyl-2-vinylcyclopropane (76) undergo rapid unimolecular ring opening. The rate constants for opening of (66<sup>·</sup>⁻) and (76<sup>·</sup>⁻) are greater than 10³ s⁻¹ but probably less than 10⁷ s⁻¹ and 10⁵ s⁻¹ respectively. Based upon our findings, …
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Enantioselective synthesis and reactivity of bicyclobutanes: strained molecular platforms for 4-, 5-, and 6-membered ring synthesis and rhodium(II)-catalyzed reactions of diazoesters with organozinc reagents
… contrast to the well-known and widely-utilized vinylcyclopropane–cyclopentene rearrangement, the analogous vinylcyclobutane–cyclohexene rearrangement has found limited use due to the requirement of harsh conditions. In Chapter 4, I will discuss the development of the first examples of transition …
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Design, Synthesis and Application of Novel Degradable Materials Based on Polyesters by Radical Ring-Opening Polymerization
… based on unsaturated polyesters by RROP of vinylcyclopropane (VCP) with cyclic ketene acetal (CKA). In the first step, the unsaturated degradable polyesters with random distribution of cross-linkable double bonds and degradable ester units were prepared by radical ring-opening …