M. Siskin et al., AQUEOUS-ORGANIC CHEMISTRY .7. UNPRECEDENTED PYRIDINE RING C-C BOND CLEAVAGES BY FORMIC-ACID, Tetrahedron letters, 34(30), 1993, pp. 4739-4742
Formic acid at 350-degrees-C converts pyridine and 4-methylpyridine in
to products deriving from both alphabeta and betagamma C-C bond cleava
ges of the pyridine ring.