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Evidence for “Halogen‐Dance” and Ring‐Exchange Reactions in Chloro‐methylthio‐ferrocenes
Author(s) -
Blockhaus Tobias,
Bernhartzeder Stefanie,
Kempinger Werner,
KleinHeßling Christian,
Weigand Stefan,
Sünkel Karlheinz
Publication year - 2020
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/ejoc.202001032
Subject(s) - chemistry , deprotonation , halogen , cyclopentadienyl complex , ligand (biochemistry) , dance , ring (chemistry) , metal , decarbonylation , medicinal chemistry , crystallography , polymer chemistry , stereochemistry , organic chemistry , ion , catalysis , art , alkyl , literature , biochemistry , receptor
The pentachloroferrocenes [C 5 Cl 5 ]Fe[C 5 H 4 X] (X = H, Br, SMe) react with LiTMP and MeSSMe to form mixtures of compounds, that contain besides the expected products of deprotonation also one or more complexes with a [C 5 Cl 4 (SMe)] ligand. This latter observation makes the otherwise rarely observed occurrence of “halogen dance reactions” in chloroaromatics very probable. 1,2,3‐Trichloroferrocene yields with BuLi and MeSSMe products of both halogen‐metal‐exchange and of deprotonation. Additionally, in all examined systems, the observation of some highly‐substituted complexes with eight or more substituents hints to the involvement of cyclopentadienyl exchange reactions, which has also rarely been observed under such mild conditions. The molecular structures of [C 5 Cl 4 (SMe)]Fe[C 5 H 3 BrX] (X = SMe or SOMe), [C 5 Cl 4 (SMe)]Fe[C 5 H 2 Cl(SMe) 2 ], [C 5 Cl 2 (SMe) 3 ] 2 Fe, and [C 5 HCl 3 (SMe)] 2 Fe have been determined by X‐ray diffraction.