In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Electronic effects in the ferrocene ring system by proton magnetic resonance spectroscopy, published in 1968, which mentions a compound: 1273-73-0, mainly applied to electronic effect ferrocene ring; ferrocene ring system PMR; ring system ferrocene PMR; PMR ferrocene ring system, Reference of Bromoferrocene.
Results of a proton magnetic resonance study of the chem. shifts of ring protons of representative monosubstituted ferrocene compounds are reported. The substituents cover a span from strongly electron-donating groups to strongly electron-withdrawing. Some relations appear to exist between the ring-proton chem. shifts in these compounds and those reported for the corresponding monosubstituted benzene compounds The chem. shifts recorded were precisely measured. As such, they serve to revise the data reported while this work was in progress. 15 references.
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Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com