REGIOSELEKTIVE -CYCLOADDITIONEN VON HETEROSUBSTITUIERTEN ALLYLIUM-2-OLATEN (OXALLYLEN) AN 2-METHYLFURAN
1,1-Dichloro- and 1,3-dichloro-2-alkanones react with 2-methylfuran in the presence of lithium perchlorate/triethylamine to form 2-chloro-1-methyl-8-oxabicyclooct-6-ene-3-ones predominantly.