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Verdoheme reactivity. Remarkable paramagnetically shifted 1H NMR spectra of intermediates from the addition of hydroxide or methoxide with FeII and FeIII verdohemes.
Autorzy
Rok wydania
2001
Czasopismo
Numer woluminu
40
Strony
4971-4977
DOI
10.1021/ic010227a
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Studies of the reaction of 5-oxaporphyrin iron complexes (verdohemes) with methoxide ion or hydroxide ion have been undertaken to understand the initial step of ring opening of verdohemes. High-spin {ClFeIII(OEOP)} undergoes a complex series of reactions upon treatment with hydroxide ion in chloroform, and similar species are also detected in dichloromethane, acetonitrile, and dimethyl sulfoxide. Three distinct paramagnetic intermediates have been identified by 1H NMR spectroscopy. These reactive species are formed by addition of hydroxide to the macrocycle and to the iron as an axial ligand. Treatment of low-spin [(py)2FeII(OEOP)]Cl (OEOP is the monoanion of octaethyl-5-oxaporphyrin) with excess methoxide ion in pyridine solution produces {(py)nFeII(OEBOMe)} (n = 1 or 2) ((OEBOMe), dianion of octaethylmethoxybiliverdin), whose 1H NMR spectrum undergoes marked alteration upon addition of further ammounts of methoxide ion. An identical 1H NMR spectrum, which is characterized by methylene resonances with both upfield and downfield paramagnetic shifts, is formed upon treatment of {FeII(OEBOMe)}2 with methoxide in pyridine solution and results from the formation of [(MeO)FeII(OEBOMe)]-.
Adres publiczny
https://doi.org/10.1021/ic010227a
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