Erratum to: New Molecular Wires with Two Ferrocene Hinges

Improved Syntheses of 1,2‐Disubstituted Ferrocenes

“…Its stability against heat and air, its three‐dimensional shape, and its redox activity are most striking. Such properties facilitate the formation of planar‐chiral derivatives and the exploitation of the facile rotation of the cyclopentadienyl ligands as a “hinge” in larger structures, for example in extended π‐systems In addition, ferrocene finds applications in many areas such as catalysis, materials sciences, bioorganometallic chemistry, and electroanalytical methods . These fields and many others have been reviewed in recent monographs ,…”

“…Among various substituted ferrocene derivatives, 1,2‐ and 1,1′‐disubstituted ones are valuable starting materials for the synthesis of more complicated structures with incorporated ferrocene moieties. 1,1′‐Disubstituted ferrocenes, which are usually obtained by 1,1′‐dilithiation of ferrocene with butyllithium/tetramethylethylenediamine (BuLi/TMEDA) followed by reaction with an electrophile, attract attention in the context of molecular wires, ferrocenophanes, and possible interactions between the substituents , , . 1,2‐Disubstituted ferrocene derivatives are often obtained by ortho ‐metallation reactions .…”

1,1′‐Dialkynylferrocenes as Substrates for Bidirectional Alkyne Metathesis Reaction

“…The yield is comparable to alkyne cross metatheses, which Stepnicka and Kotora et al reported with Mortreux catalyst 35. Compound 23 has been prepared by a Sonogashira coupling of 1‐ethynyl‐1′‐iodoferrocene with 1‐( tert ‐butylsulfanyl)‐4‐iodobenzene in 95 % yield 10,36. Encouraged by this result twofold cross metathesis reactions were tried with the mentioned diynes.…”

“…Cross Metathesis Reaction with 10 and 12: GP, 1‐iodo‐1′‐(1‐propynyl)ferrocene25 ( 12 ; 88 mg, 0.3 mmol) and 1‐( tert ‐butylsulfanyl)‐4‐(1‐propynyl)benzene29 ( 10 ; 51 mg, 0.3 mmol), µW (300 W), 130 °C, 30 min RAMP, 120 min HOLD. 1‐{[4‐( tert ‐Butylsulfanyl)phenyl]ethynyl}‐1′‐iodoferrocene ( 23 ; 69 mg, 0.1 mmol, 55 %) was obtained as a dark red solid, identified by 1 H NMR spectroscopy 10,36…”

Reactions of Alkynyl‐ and 1,1′‐Dialkynylferrocenes with Tetracyanoethylene – Unanticipated Addition at the Less Electron‐Rich of Two Triple Bonds

“…Propynylferrocene [38] (1Ј-iodoferrocenyl)-buta-1,3-diene-1,1,4,4-tetracarbonitrile (13): 1-[(4-tert-Butylsulfanyl)phenylethynyl]-1Ј-iodoferrocene [7,51] (12, 69 mg, 0.1 mmol) and TCNE (1, 18 mg, 0.1 mmol) were dissolved in dichloromethane (5 mL). The orange solution became red within 30 min and then dark green.…”