The basicities of pyridines appear related to their reactivity towards acetylenic esters. The products from 4-cyano- and 2-methoxy-pyridine, and methyl 2-pyridylacetates with dialkyl acetylenedicarboxylates have been identified from their spectra and reactions.
R. M. Acheson and D. A. Robinson, J. Chem. Soc. C, 1968, 1629 DOI: 10.1039/J39680001629
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