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Die nach Literaturangaben dargestellten Methylencyclopropane (I) werden nach dem Verfahren von Doering oder Makosza mit Dichlor‐ bzw. Dibromcarben in die Titelverbindungen (II) übergeführt.

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The reaction of benzil with methyl alkyl ketones gave three isomeric cyclopentenone derivatives, 2-substituted and cis-and trans-5-substituted 4-hydroxy-3,4-diphenylcyclopent-2-en-1-ones. cis-and trans-2,5-Disubstituted 4-hydroxy-3,4-diphenylcyclopent-2-en-1-ones were formed in analogous reaction of benzil with dialkyl ketones. The structure of the products was confirmed by 1 H NMR spectroscopy and molecularmechanics calculations.