Ozonolysis of cyclopentadiene derivatives. Competitive participation of [3 + 2] and [3 + 4] cycloadditions of carbonyl oxide moieties to α,β-unsaturated carbonyl groups

Mitsuyuki Mori, Hideyuki Yamakoshi, Masatomo Nojima, Shigekazu Kusabayashi, Kevin J. McCullough, Karl Griesbaum, Petra Krieger-Beck, In Chan Jung

Research output: Contribution to journalArticle

Abstract

Reactions between cyclopenta-1,3-dienes 1a-i and ozone, conducted in a variety of solvents including diethyl ether, pentane, CCl4, CH 2Cl2, CF3CH2OH, AcOH, and MeOH, afforded predominantly monomeric ozonolysis products consisting of either bicyclic endoperoxides 5 containing a 1,2,4-trioxepine ring, or unsaturated bicyclic ozonides 6, or mixtures of compounds 5 and 6. From their molecular structures, the novel bicyclic endoperoxides 5 are considered to result from intramolecular recombination of the carbonyl oxide and enone moieties, generated specifically from only one of the two possible decomposition modes of the primary ozonide, via stepwise [3 + 4] cycloaddition processes. The product composition was found to be sensitive to the nature of the substituents and the substitution pattern in the cyclopentadiene substrate, and the ozonolysis solvent. In general, protic solvents tended to assist the formation of the endoperoxides 5. The isomeric peroxides 5 and 6 could, in several instances, be interconverted by treatment with acid catalysts like CF3CO 2H, or even silica gel.

Original languageEnglish
Pages (from-to)1335-1343
Number of pages9
JournalJournal of the Chemical Society, Perkin Transactions 1
Issue number12
Publication statusPublished - 1993

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