They are both crystalline solids, the former melting when anhydrous at 199-200°, and the latter at 52° C. ' Of the homologues of quinoline, the most important are quinaldine, lepidine, -y-phenylquinoline, and flavoline.
Lepidine(y-methylquinoline) was first obtained by distilling cinchonine with caustic potash.
It may also be prepared by condensing ay-dimethylquinoline and formaldehyde, the resulting a-ethanollepidine, C9H5 CH3N(CH2 CH2.OH), breaks down on heating and forms lepidine (W.
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