TY - JOUR
T1 - Rhenium, palladium, and copper pyridylalkoxide complexes
T2 - Synthesis, structural characterization, and catalytic application in epoxidation reactions
AU - Lobmaier, Gerhard M.
AU - Frey, Guido D.
AU - Dewhurst, Rian D.
AU - Herdtweck, Eberhardt
AU - Herrmann, Wolfgang A.
PY - 2007/12/3
Y1 - 2007/12/3
N2 - Reaction of bis(alkyl/aryl)-2-pyridylalcoholate ligands (a-g) with [ReOCl 4](NBu 4) results in the formation of metal-oxo complexes of the general formula [ReOCl 3(L)](NBu 4) (2, 3) and [ReOCl(L) 2] (4, 5), with L = bis(alkyl/aryl)-2-pyridylalcoholate. Molecular structures of the complexes 2a, 4a, and 5a have been determined by single-crystal X-ray diffraction studies. Besides the expected crystal structure of 4a, where an alkoxide site of one of the ligands is coordinated trans to the rhenyloxo fragment, complex 5a shows a rare example of a trans chloro-oxo [ReOCl(L) 2] connectivity. Additionally, starting from Pd(OAc) 2 and [CuCl 2-2(H 20)] complexes of the form [M(L) 2] (M = Cu, Pd) (6a-g and 8a) were prepared. For complexes 6a and 8a molecular structures have been determined by single-crystal X-ray diffraction studies, which showed the expected square planar geometry with the pyridine ring nitrogens situated mutually in trans position. Complexes 3,4,6, and 8 were tested in the epoxidation reaction of cyclooctene with TBHP (tert-butylhydrogenperoxide).
AB - Reaction of bis(alkyl/aryl)-2-pyridylalcoholate ligands (a-g) with [ReOCl 4](NBu 4) results in the formation of metal-oxo complexes of the general formula [ReOCl 3(L)](NBu 4) (2, 3) and [ReOCl(L) 2] (4, 5), with L = bis(alkyl/aryl)-2-pyridylalcoholate. Molecular structures of the complexes 2a, 4a, and 5a have been determined by single-crystal X-ray diffraction studies. Besides the expected crystal structure of 4a, where an alkoxide site of one of the ligands is coordinated trans to the rhenyloxo fragment, complex 5a shows a rare example of a trans chloro-oxo [ReOCl(L) 2] connectivity. Additionally, starting from Pd(OAc) 2 and [CuCl 2-2(H 20)] complexes of the form [M(L) 2] (M = Cu, Pd) (6a-g and 8a) were prepared. For complexes 6a and 8a molecular structures have been determined by single-crystal X-ray diffraction studies, which showed the expected square planar geometry with the pyridine ring nitrogens situated mutually in trans position. Complexes 3,4,6, and 8 were tested in the epoxidation reaction of cyclooctene with TBHP (tert-butylhydrogenperoxide).
UR - http://www.scopus.com/inward/record.url?scp=37249007278&partnerID=8YFLogxK
U2 - 10.1021/om700738f
DO - 10.1021/om700738f
M3 - Article
AN - SCOPUS:37249007278
SN - 0276-7333
VL - 26
SP - 6290
EP - 6299
JO - Organometallics
JF - Organometallics
IS - 25
ER -