“Piano‐Stool” Complexes of Ruthenium(II) Designed with Arenes and
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‐[2‐(Arylchalcogeno)ethyl]morpholines: Highly Active Catalysts for the Oxidation of Alcohols with
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‐Methylmorpholine
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‐Oxide,
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‐Butyl Hydroperoxide and Sodium Periodate and Oxychloride
作者:Pradhumn Singh、Ajai K. Singh
DOI:10.1002/ejic.201000319
日期:2010.9
irreversible oxidation (E ½ = 0.290-0.586 V). All the ruthenium complexes have been explored for their catalytic activity in the oxidation of primary and secondary alcohols with N-methylmorpholine N-oxide (NMO), tBuOOH, NaOCl, and NaI0 4 (TON values upto 9.8 × 10 4 ). The efficiency of the catalytic oxidation reaction decreases in the order Te > Se > S. The intermediate species involved in the oxidation reactions
[(η 6 -C 6 H 6 )RuCl(μ-Cl)} 2 ]和[(η 6 -p-cymene)-RuCl(μ-Cl)} 2 ]与N-[2-的反应(芳基硫属元素)乙基]吗啉(L)(芳基=Ph/2-吡啶基,S,Ph,Te,4-MeOC 6 H 4)和NH 4 PF 6 导致Ru II的“钢琴-粪便”复合物组成 [RuCl(η 6 -C 6 H 6 )(L)][PF 6 ]/[RuCl(η 6 -p-伞花烃)(L)]-[PF 6 ],给出特征 1 H, 13 C 1 H}、77 Se 1 H} 和 125 Te 1 H} NMR 光谱。其中一些还通过 X 射线晶体学表征 [Ru-S、Ru-Se 和 Ru-Te 键长:2.3815(12)/2.3742(14)、2.4837(14) 和 2.6143(7) A,分别]。循环伏安图显示所有配合物都发生不可逆氧化 (E ½ = 0.290-0
Rhodium(III) complexes of N-{2-(arylseleno/telluro)ethyl} morpholine: Synthesis, structure and applications as efficient catalyst for transfer hydrogenation reaction of ketones
作者:Pradhumn Singh、Dipanwita Das、Monika Singh、Ajai K. Singh
DOI:10.1016/j.inoche.2010.05.014
日期:2010.8
resulting in complexes [RhCl2(L1/L2)4][ClO4] (1/2). 1H, 13C1H} and 77Se1H}/125Te1H} NMR spectra of L1, L2, 1 and 2 were found characteristic. The single crystal structure of 2 has been solved. The L2 binds with Rh in 2 as a monodentate ligand. The geometry around Rh is distorted octahedral. The Rh–Te distances are in the range 2.6509(9)–2.6688(8) Ǻ. Both the complexesefficiently catalyze transfer hydrogenation