Synthesis and Structures of NCN Pincer-Type Ruthenium and Iridium Complexes Bearing Protic Pyrazole Arms
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https://figshare.com/articles/dataset/Synthesis_and_Structures_of_NCN_Pincer-Type_Ruthenium_and_Iridium_Complexes_Bearing_Protic_Pyrazole_Arms/4748179
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资源简介：
The reaction of the
1,3-bis(pyrazol-3-yl)benzenes 1 with [RuCl(OAc)(PPh3)3] resulted in selective
C–H cleavage at the 2-position of 1 to give the
protic NCN pincer-type ruthenium(II) complexes [RuCl(R-NCN-LH2)(PPh3)2] (2; R-NCN-LH2 = 4-R-2,6-bis(5-tert-butyl-1H-pyrazol-3-yl)phenyl). Similar cyclometalation with iridium trichloride
followed by addition of triphenylphosphine led to the formation of
the iridium(III) analogue [IrCl(But-NCN-LH2)(PPh3)]Cl (5). Treatment of the ruthenium
complexes 2 with carbon monoxide afforded the carbonyl
complexes [Ru(CO)(R-NCN-LH2)(PPh3)2]Cl (4). On the other hand, the pyridine analogue of 1, 2,6-bis(5-tert-butyl-1H-pyrazol-3-yl)pyridine (NNN-LH2), reacted with iridium
trichloride to yield the protic NNN pincer-type complex [IrCl3(NNN-LH3)] (7). The stronger σ
donation of the NCN pincer-type ligand in comparison with the analogous
NNN ligand was suggested by the CO stretching frequencies of the ruthenium
carbonyl complexes 4 as well as the M–Cl distances.
The catalytic activity of the ruthenium complexes 2a,b toward transfer hydrogenation of a ketone was also evaluated.
创建时间：
2017-03-13
