J. P. WIBAUT and LG HEERINGA * ) (Laboratory for Organic Chemistry of the Municipal University of Amsterdam). 99th Communication on Derivatives of Pyridine and Quinoline. ... 4-Chloropyridine can be converted for about 70% into a complex magnesium compound, which reacts in the manner of a Grignad compound with aldehydes or ketones, forming (4-pyridyl) -carbinols; with orthoformic ester, (4-pyridyl)-methanal-acetal is formed. The reaction of 4-lithiopyridine with ...