The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Reciprocal transformation of optical antipodes, II》. Authors are Walden, P.; Lutz, O..The article about the compound:(S)-2-Bromosuccinic acidcas:20859-23-8,SMILESS:O=C(O)[C@@H](Br)CC(O)=O).SDS of cas: 20859-23-8. Through the article, more information about this compound (cas:20859-23-8) is conveyed.
l-brom, and l-chlor-succinic acids with silver oxid give l-malic acid; heated with alcoholic ammonia, on the other hand, they give rise to d-amino-succinic acid, which on boiling with baryta water gives off ammonia and is converted into the barium salt of d-malic acid.
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Reference:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”