The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Halogen compounds of ferrocene》. Authors are Nesmeyanov, A. N.; Perevalova, E. G.; Nesmeyanova, O. A..The article about the compound:Bromoferrocenecas:1273-73-0,SMILESS:Br[C-]12[Fe+2]3456789([C-]%10C6=C7C8=C9%10)C1=C3C4=C25).Safety of Bromoferrocene. Through the article, more information about this compound (cas:1273-73-0) is conveyed.
Iodine and ferrocene in organic medium yields a complex containing 20 atoms of iodine per mole of ferrocene, a black solid with green luster, decompose 170-2°; crystallization from Me2CO yields a complex with 6 atoms of iodine per mol., black, decompose 125-30°. The former complex in H2O yields the ferricinium cation color, while the latter complex is unattacked by H2O. Na2S2O3 removes iodine, from the complexes. Br and ferrocene give a brown complex, which is flammable when dry. Heating ferrocene with Br in CCl4 yields pentabromocyclopentane, m. 103-4°; Cl decomposes ferrocene at room temperature but at -30° in CHCl3 it yields a complex with 26% Cl. Ferrocenylmercury chloride in hot xylene treated with iodine gave a green precipitate of a complex of ferrocenylmercury chloride with 4 atoms of iodine; aqueous Na2S2O3 converts this to bisferrocenylmercury. Much iodine converts the complex and replaces Hg by iodine and the precipitate turns black, yielding 64% iodoferrocene after treatment with Na2S2O3. Iodoferrocene is yellow-orange, m. 44-5°, is volatile with steam and can be crystallized from MeOH at -10°. Its iodine is inert; heated to 100° it yields ferrocene and some C; it fails to form RMgI with Mg. Bisferrocenylmercury with excess Br in CHCl3 gave after 0.5 hr. refluxing, followed by treatment with Na2S2O3, a low yield of bromoferrocene, yellow, m. 30-1° (from MeOH). Treatment of bis(chloromercury)ferrocene with I or Br gave the corresponding diiodo- and dibromoferrocenes. The former, 25%, was not pure even after chromatographic purification; it was a red liquid, d20 2.286, d36 2.262, nD26 1.682. Dibromoferrocene, red liquid, absorption maximum 438 mμ. Bromoferrocene has an absolute maximum at 437; diiodoferrocene 438; iodoferrocene 435 mμ.
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Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com