No abstract

A mechanism of fragmentation for five membered heterocyclic‐substituted acids is proposed. The suggested four centered transition state for the CO2 elimination is based on the resulting deuterium‐labelled ions.

The transformation of benzoin to tetraphenylfuran catalyzed with a superacid sulfonic clay under different reaction conditions was investigated. Three products with different yields were produced under a nitrogen stream and four products were obtained under an air atmosphere.

Die Decarboxylierung von vergchiedenen Carbonsäuren (I) ‐/(III) wird diskugiert.