Synthesis of 2-carboxybenzaldehyde from phthalide via chlorination
<p>US Pat. 2484029
DE Pat. 848818
</p>
DOI: 10.1002/hlca.19510340122
cropped by <a href="//commons.wikimedia.org/wiki/User:DMacks" title="User:DMacks">DMacks</a> from original by <a href="//commons.wikimedia.org/wiki/User:Nuklear" title="User:Nuklear">Nuklear</a>
<span class="int-own-work" lang="en">Own work</span>