2-Aminothiazole is obtained by cyclization of thiourea and chloroacetaldehyde (or ethanol and chlorine, or α, β dichloro ethyl ether). Add hot water, thiourea and α, β-dichloroethyl ether to the reactor. Reflux for 2h under stirring. After cooling, sodium hydroxide solution was added t

3-Methylpyridine is mainly used for the preparation of nicotinic acid and nicotinamide in medicine and feed, so how is 3-Methylpyridine prepared?