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Rhodium‐ and ruthenium‐complex‐catalyzed condensation of ferrocene‐containing dithiols and diols with diarylsilanes to give silaferrocenophanes and ferrocene polymers
Author(s) -
Yamaguchi Isao,
Ishii Hidetake,
Sakano Tatsuaki,
Osakada Kohtaro,
Yamamoto Takakazu
Publication year - 2001
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.143
Subject(s) - chemistry , ferrocene , catalysis , silane , polymer chemistry , ruthenium , polystyrene , rhodium , condensation reaction , polymer , transition metal , toluene , infrared spectroscopy , medicinal chemistry , organic chemistry , electrochemistry , electrode
1,1′‐Ferrocenedithiol reacts with di(4‐methoxyphenyl)silane, diphenylsilane, and di(4‐fluorophenyl)silane in the presence of RhCl(PPh 3 ) 3 catalyst to give mixtures of 2,2‐diaryl‐1,3‐dithia‐2‐sila[3]ferrocenophanes (1a–3a) and (FcSSiAr 2 S) n (Fc = 1,1′‐ferrocenylene; 1b: Ar = C 6 H 4 OMe‐4; 2b: Ar = Ph; 3b: Ar = C 6 H 4 F‐4). The products are isolated and characterized by NMR spectroscopy and elemental analyses. The polymers 1b–3b, obtained from a toluene‐soluble fraction of the products, show GPC elution patterns corresponding to M n values of 2700–4600 (polystyrene standards). The UV–vis spectra of the ferrocenophanes and polymers exhibit a d–d transition peak at about 440 nm, while the polymers show a π – π * transition peak at 320–330 nm. The cyclic voltammograms of 3a (Ar = C 6 H 4 F − 4) and 3b show a reversible redox of the iron center at 0.27 V and 0.35 V (Ag + /Ag) respectively. Reaction of 1,1′‐ferrocenedimethanol with diphenylsilane in the presence of RuCl 2 (PPh 3 ) 3 catalyst results in selective formation of 3,3‐diphenyl‐2,4‐dioxa‐3‐sila[5]ferrocenophane ( 4 ), whose structure was determined by X‐ray crystallography. Copyright © 2001 John Wiley & Sons, Ltd.