“Piano‐Stool” Complexes of Ruthenium(II) Designed with Arenes and
<i>N</i>
‐[2‐(Arylchalcogeno)ethyl]morpholines: Highly Active Catalysts for the Oxidation of Alcohols with
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‐Methylmorpholine
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‐Oxide,
<i>tert</i>
‐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
Synthesis and structural chemistry of N-{2-(arylthio/seleno)ethyl}morpholine/piperidine–palladium(II) complexes as potent catalysts for the Heck reaction
作者:Pradhumn Singh、Dipanwita Das、Om Prakash、Ajai K. Singh
DOI:10.1016/j.ica.2012.07.029
日期:2013.1
Abstract The reactions of in-situ generated PhS − , PyS − and PhSe − with 4-(2-chloroethyl)morpholine hydrochloride and 1-(2-chloroethyl)piperidine hydrochloride in N 2 atmosphere have resulted in N -2-(arylchalcogeno)ethyl}morpholine/piperidine ligands ( L1 − L6 ), which on reaction with Na 2 PdCl 4 at room temperature result in complexes of composition [PdCl 2 ( L )] ( 1 – 6 ; L = L1 − L6 ). All
摘要在N 2气氛下原位生成的PhS-,PyS-和PhSe-与4-(2-氯乙基)吗啉盐酸盐和1-(2-氯乙基)哌啶盐酸盐的反应导致了N-2-(芳基硫属元素基) )乙基}吗啉/哌啶配体(L1-L6),在室温下与Na 2 PdCl 4反应时,会形成[PdCl 2(L)]组成的配合物(1-6; L = L1-L6)。除2以外的所有配合物均已通过X射线晶体学表征。在所有情况下,Pd周围的几何形状几乎都是正方形平面。Pd-S和Pd-Se键长分别在2.2598(10)-2.2795(14)和2.3541(6)-2.3632(15)A范围内。在具有L5和L6(Se配体)的Pd(II)配合物的77 Se 1 H} NMR光谱中,相对于相应的游离配体而言,信号出现的频率更高(最高187 ppm)。钯(II)-络合物(2,已经发现4和6)对于芳基溴化物与丙烯酸甲酯的Heck反应是有希望的。TON值高达18 200,TOF高达758