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Showing 1 to 5 of 5 for “"1,2-Dioxolane"”.
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Synthesis and Chemiluminescent Investigation of Malonyl Peroxides
The three malonyl peroxides 4-methyl-4-phenyl-1,2-dioxolane-3,5-dione (3), 4-diphenylmethyl-4-methyl-1,2-dioxolane-3,5-dione (4), and 4-methyl-4-(1-propenyl)-1,2-dioxolane-3,5-dione (5) are prepared by the methanesulfonic acid catalyzed reaction of hydrogen peroxide with the parent malonic acids. …
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Preparation and Chemiluminescence of Cyclopropyl-Substituted Malonyl Peroxides
4-Spiro{(2'-spirocyclopropyl)-cyclohexyl}-1,2-dioxolane-3,5-dione (2) and 4-cyclopropyl-4-methyl-1,2-dioxolane-3,5-dione (1) are prepared by the reaction of dicyclohexylcarbodiimide and hydrogen peroxide with the parent malonic acids. Chemiluminescence is observed when the cyclopropyl-substituted …
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Synthesis of novel cycloperoxides
… a novel synthetic route to 3,5-substituted 1,2-dioxolane ethyl esters through the chemoselective reduction of a δ-peroxy-β-keto ester to the corresponding δ-peroxy-β-hydroxy ester, and subsequent phosphorus pentoxide-mediated cyclisation. Chapter 5 outlines our preparation of several novel …
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Biologically Active Compounds From Caribbean Sponges
… and structure elucidation of a number of 1,2-dioxolane and 1,2 dioxane acids and esters from two caribbean sponges is described. Interest in these compounds was motivated by the acid's pharmacological activities when tested in vitro against various gram positive bacteria, yeasts and fungi. The …
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Mechanisms of Chemiluminescence
… of 4-bromo-3-hydroxy-3,5,5-trimethyl-1,2-dioxolane. Thermal decomposition of this dissymmetric dioxetane to acetone and methylglyoxal proceeds with an activation energy of 26.0 (+OR-) 1 kcal/mol and a log A of 14.2. The enthalpy of activation and entropy of activation were determined to be …