Attempts have been made on trifluoroacelJc acid catalysed Diels-Alder reaction of furan, 2,5-dimethylfuran and 2,5-diphenylfuran with ,8-ferroccnyl-a-enones. No Diels-Alder products were isolated or detected but products from the FriedeI-Crafls fl-alkylation of furan ring were prepared in some cases. Reaction with 1,3-diphenylbenzo[c]furan under the same conditions resulted in the formation of a formal [4+3 ] cycioaddition product containing 1,2-disubstituted ferrocene.
- trifluoroacelJc acid
- furan ring