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https://doi.org/10.1135/cccc19743684
Acid-catalysed intramolecular Michael addition of 1-acyl-1'-cinnamoylferrocenes. Proof of the structure of 2-substituted 3-phenyl[5]ferrocenophane-1,5-diones
P. Elečko, E. Solčaniová and M. Vida