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Synthesis and properties of chiral rhenium pentatetraenylidene complexes of the formula [(η5-C5Me5)Re(NO)(PPh3)(C=C=C=C=CAr2)]+BF4 (CAr2=9-fluorenylidene).
Autorzy
Rok wydania
2000
Czasopismo
Journal of Organometallic Chemistry
Numer woluminu
604
Strony
52-58
DOI
10.1016/S0022-328X(00)00201-1
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The sequential reaction of (η5-C5Me5)Re(NO)(PPh3)(CCCCH) with n-BuLi (one equivalent), 9-fluorenone (OCAr2; 1.5 equivalents), and Me3O+BF4− (3.0 equivalents) gives thermally labile (η5-C5Me5)Re(NO)(PPh3)(CCCCC(OMe)Ar2) (2a) as an orange–red powder in 69% yield. Analogous reactions with 2,7-dichloro- and 2,7-dibromofluorenone give the corresponding complexes 2b,c (68–71%). Treatment of 2a–c with BF3·OEt2 (one equivalent) gave the title complexes (3a–c) as labile dark blue powders (79–83%) that exhibited diagnostic cumulenic IR bands νCCC (1993–1987, 1902–1894 cm−1) and ReC 13C-NMR signals (256.9 ppm, JCP=10.8 Hz), and richly featured UV–vis spectra. Attempts to prepare stabile derivatives of 3a–c (additions of phosphines, amines, TCNE; anion metatheses) invariably gave a multitude of products.
Słowa kluczowe
Rhenium, Cumulenes, atom, 3-Dibutadiynyl, Fluorenyl, Pentatetraenylidene
Adres publiczny
https://doi.org/10.1016/S0022-328X(00)00201-1
Strona internetowa wydawcy
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