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2,5‐Dimethylthiophene coordination to three metal centers in the complexes (η 4 , S‐μ 3 ‐2,5‐Me 2 T)(IrCp*) [M(CO) 2 Cp] 2 where MMo or W
Author(s) -
Chen Jiabi,
Angelici Robert J
Publication year - 1992
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.590060508
Subject(s) - chemistry , thiophene , reactivity (psychology) , ligand (biochemistry) , dimer , hydrodesulfurization , metal , iridium , metallacycle , stereochemistry , medicinal chemistry , ring (chemistry) , photodissociation , photochemistry , catalysis , x ray crystallography , organic chemistry , medicine , biochemistry , alternative medicine , receptor , physics , pathology , diffraction , optics
The 2,5‐dimethylthiophene (2,5‐Me 2 T) ligand in the isomers Cp*Ir(η 4 ‐2,5‐Me 2 T) (1) and Cp*Ir( C,S ‐2,5‐Me 2 T) (2) is activated to react with the dimers Cp(CO) 2 MM(CO) 2 Cp[MMo (3), W (4)] to give complexes (5,6) in which the thiophene is coordinated to three metals. Oxidation of 5 with Cp 2 Fe + removesthe Mo dimer to give Cp*Ir(η 5 ‐2,5‐Me 2 T) 2+ . Reaction of 5 with CO displaces the Mo as [CpMo(CO) 3 ] 2 to give Cp*Ir(CO)( C,S ‐2,5‐Me 2 T) (7). Ultraviolet photolysis of 1 provides a convenient route to the ring‐opened isomer 2. Despite the remarkable nature of the thiophene coordination in 5 and 6, its reactivity does not suggest new pathways that would lead to the hydrodesulfurization of thiophenes.