The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Synthesis and isomerization of 4-hydroxy-4-methyl-3-hepten-6-yn-2-yl-cyclopentadienylmanganese tricarbonyl》. Authors are Anisimov, K. N.; Kolobova, N. E.; Magomedov, G. K. I..The article about the compound:Bromoferrocenecas:1273-73-0,SMILESS:Br[C-]12[Fe+2]3456789([C-]%10C6=C7C8=C9%10)C1=C3C4=C25).Electric Literature of C10BrFe. Through the article, more information about this compound (cas:1273-73-0) is conveyed.
cf. CA 61, 13336f. Propargyl bromide added in Et2O to Mg activated with HgCl2 gave a solution of the Grignard reagent which with 2-penten-4-on-2-ylcyclopentadienylmanganese tricarbonyl in 3 h. refluxing gave 81% I, b0.007 85-6°, n20D 1.5945, d20 1.2936; ir spectrum and uv spectrum shown. Heated with KHSO4 in vacuo to 100-20°, I gave 50% yellow 4-methyl-2,4-heptadien-6-on-2-ylcyclopentadienylmanganese tricarbonyl, b0.007 95-6°, 1.6112, 1.3030, also formed from I by heating in EtOH with HgSO4; ir spectrum shown. The ketone was unstable in air, but gave a red 2,4-dinitrophenylhydrazone, m. 156°.
After consulting a lot of data, we found that this compound(1273-73-0)Electric Literature of C10BrFe can be used in many types of reactions. And in most cases, this compound has more advantages.
Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com