The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Replacement of halogen in halo ferrocenes by a proton》. Authors are Nesmeyanov, A. N.; Kursanov, D. N.; Nefedova, M. N.; Setkina, V. N.; Perevalova, E. G..The article about the compound:Bromoferrocenecas:1273-73-0,SMILESS:Br[C-]12[Fe+2]3456789([C-]%10C6=C7C8=C9%10)C1=C3C4=C25).Related Products of 1273-73-0. Through the article, more information about this compound (cas:1273-73-0) is conveyed.
Iodoferrocene and CF3CO2D in C6H6 under N atm. gave a dark violet precipitate which was separated and the filtrate extracted with H2O gave in the extract the evidence of ferricinium ion; treated with Na2SO3 it gave ferrocene containing 9.5% D; the precipitate gave iodoferrocene, which with I gave the dark violet precipitate as above. Bromoferrocene similarly gave 10% ferrocene while chloroferrocene gave some chloroferrocene containing 25% D.
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Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com