- Synthesis and structures of 1,2,4-triazoles derivatives
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Abstract A series of novel 1,2,4-triazole derivatives were synthesized, and their structures were characterized by IR, UV-Vis, FL, NMR, ESI-MS, and elemental analysis. In the meanwhile, the single crystal structures of 3,4-diethyl-5-(4-pyridyl)-1,2,4-triazole and 3,4-dimethyl-5-(o-hydroxyphenyl)-1,2,4-triazole were determined by X-ray diffraction.
- Wang, Ning,Sheng, Jun-Feng,Song, Fei,Tong, Yu-Zhu,Wang, Zuo-Xiang
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- Dinuclear manganese alkoxide complexes as catalysts for C-N bond cleavage of simple tertiary: N, N -dialkylamides to give esters
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Amide bonds are stable due to the resonance between the nitrogen lone pair and the carbonyl moiety, and therefore the chemical transformation of amides, especially tertiary amides, involving C-N bond fission is considered one of the most difficult organic reactions, unavoidably requiring harsh reaction conditions and strong acids or bases. We report the catalytic C-N bond cleavage of simple tertiary N,N-dialkylamides to give corresponding esters using a catalyst system (2 mol% based on Mn atoms) of a tetranuclear manganese alkoxide, [Mn(acac)(OEt)(EtOH)]4 (1c), combined with four equivalents of 4,7-bis(dimethylamino)-1,10-phenanthroline (L1: Me2N-Phen). Regarding the reaction mechanism, we isolated a dinuclear manganese complex, [Mn(acac)(OEt)(Phen)]2 (6c), which was revealed as the catalytically active species for the esterification of tertiary amides.
- Nagae, Haruki,Hirai, Takahiro,Kato, Daiki,Soma, Shusei,Akebi, Shin-Ya,Mashima, Kazushi
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p. 2860 - 2868
(2019/03/13)
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- Manganese(II)-Catalyzed Esterification of N-β-Hydroxyethylamides
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A catalyst system of manganese with 2,2-bipyridine for amide alcoholysis of N-β-hydroxyethylamides is described. This protocol enabled selective cleavage of the amide bond through a mechanism involving sequential N,O-acyl rearrangement and transesterification.
- Nishii, Yuji,Akiyama, Shoko,Kita, Yusuke,Mashima, Kazushi
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supporting information
p. 1831 - 1834
(2015/08/06)
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- Polyurea-encapsulated palladium(II) acetate: A robust and recyclable catalyst for use in conventional and supercritical media
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Palladium(II) acetate microencapsulated in polyurea (MC-[Pd]) is an economical and versatile heterogeneous catalyst for a range of phosphine-free cross-coupling reactions in both conventional solvents and supercritical carbon dioxide (scCO2); the catalyst can be recovered by a simple filtration and recycled up to four times.
- Ley, Steven V.,Ramarao, Chandrashekar,Gordon, Richard S.,Holmes, Andrew B.,Morrison, Angus J.,McConvey,Shirley, Ian M.,Smith, Stephen C.,Smith, Martin D.
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p. 1134 - 1135
(2007/10/03)
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