ChemInform Abstract: Ethynylation of 2‐(Furan‐2‐yl)‐ and 2‐(thiophen‐2‐yl)pyrroles with Acylbromoacetylenes in the Al2O3 Medium: Relative Reactivity of Heterocycles. Issue 17 (April 2015) - Sobenina, Lyubov' N.
Abstract Simple grinding of the title substrates with Al2O3 results in highly selective ethynylation of the pyrrole rings.