c=s(conj. CHO), and the n.m.r. spectra showed the aldehyde proton signal as a doublet ( J 4 Hz) at T ca. 0.1 coupled to the vinyl proton (d, J 4 Hz) at 7 ca. 3.2.2-Aminopyridine yielded the expected product (17) together with 4,7-dichloroquinoline. P-Aminoethanol
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