The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Determination of the relative signs of proton-proton spin a coupling constants》. Authors are McLauchlan, K. A..The article about the compound:2,3-Dibromopropionic acidcas:600-05-5,SMILESS:O=C(O)C(Br)CBr).Electric Literature of C3H4Br2O2. Through the article, more information about this compound (cas:600-05-5) is conveyed.
cf. CA 57, 306d, 13322d. Three different methods, accurate analysis, double irradiation, and doublequantum spectra, by which the relative signs of proton-proton spin coupling constants can be determined, are discussed. In particular, each is applied to the 1,2-dibromopropionic acid mol. which contains geminate and vicinal couplings of opposite sign. The double-quantum spectrum gave the relative signs in a particularly simple manner.
The article 《Determination of the relative signs of proton-proton spin a coupling constants》 also mentions many details about this compound(600-05-5)Electric Literature of C3H4Br2O2, you can pay attention to it, because details determine success or failure
Reference:
Piperidine – Wikipedia,
Piperidine | C5H11N – PubChem