[2+2]-Photocycloaddition von Cyclohexen an 2-Acetyl-5,5-dimethyl-1,3-cyclohexandion und 3-Acetyl-1,5,5-trimethyl-2,4-pyrrolidindion |
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Authors: | Hans-Georg Henning Giedrius Mazunaitis |
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Affiliation: | (1) Institut für Organische Chemie, Humboldt-Universität Berlin, D-O-1040 Berlin, Bundesrepublik Deutschland |
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Abstract: | Summary Irradiation of solutions of excess cyclohexene and 2-acetyl-5,5-dimethyl-1,3-cyclohexanedione (1), and 3-acetyl-1,5,5-trimethyl-2,4-pyrrolidinedione (4) results mainly in the formation of 1,5-diones2 and5. These originate from intermediate cycloadducts of cyclohexene and theexo-enols of the cyclic 1,3-diketones. The yields decrease with increasing polarity of the solvent. In solution2 and5 are in equilibrium with the cyclic hemiacetales3 and6. |
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Keywords: | [2+2]-Photocycloaddition 2-Acetyl-5,5-dimethyl-1,3-cyclohexanedione 3-Acetyl-1,5,5-trimethyl-2,4-pyrrolidinedione 2-(2 /content/g6m1j3g76802mgh5/xxlarge8242.gif" alt=" prime" align=" BASELINE" BORDER=" 0" >-Acetyl-cyclohexyl)-5,5-dimethyl-1,3-cyclohexanedione 3-(2 /content/g6m1j3g76802mgh5/xxlarge8242.gif" alt=" prime" align=" BASELINE" BORDER=" 0" >-Acetyl-cyclohexyl)-1,5,5-trimethyl-2,4-pyrrolidinedione |
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