Abstract
The title compounds 5 and/or their dimers 6, obtained by ring closure of the diacyl derivatives 4, exist in monomeric and dimeric forms in aprotic solvents, the positions of equilibria being dependent on the nature of the substituents and solvent. In several cases the pure monomeric and dimeric forms were obtained in the crystalline state. In protic solvents adducts of types 7 and 12 are formed, some of which are stable in the crystalline state. IR, NMR and mass spectra of compounds 5–7 and 12, and several dark reactions, are discussed.
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