Abstract
The SnCl4 catalysed reaction of oleic acid ethyl ester (1) with glyoxylic acid ethyl ester (2) or mesoxalic acid diethyl ester (5) proceeds with good results yielding the corresponding 1:1-adducts. Besides the ene adducts also δ-lactones are formed by the reaction of (1) with (5). The product yield shows a strong dependency on type and quantity of the Lewis-acid used. A maximum yield was obtained with a stoichiometric amount of SnCl4. In contrast to the thermal ene reaction about 75% of the yield was attained already during the first 30 min of the reaction.
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