反应详情

A mixture of 9.0 g of 5-(3-chloropropoxy)-2-pyridinecarboxylic acid methyl ester and 100 ml of 6 N-hydrochloric acid is heated on a steam bath for 30 minutes. After that, the solution is cooled and evaporated to a residue. To the residue is added water and the resulting suspension is adjusted to pH 5 with saturated aqueous solution of sodium bicarbonate. The precipitated product is collected, dissolved in ethyl acetate and filtered. The filtrate is evaporated to a small volume. To the concentrate is added hexane to yield 5-(3-chloropropoxy)-2-pyridinecarboxylic acid melting at 120°-121°.

1. temperatureis heated on a steam bath for 30 minutes
2. temperatureAfter that, the solution is cooled
3. customevaporated to a residue
4. additionTo the residue is added water
5. customThe precipitated product is collected
6. dissolutiondissolved in ethyl acetate
7. filtrationfiltered
8. customThe filtrate is evaporated to a small volume
9. additionTo the concentrate is added hexane