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Sen, Sutapa; Saha, Manas Kumar; Gupta, Tarakranjan; Karmakar, Aswini K.; Kundu, Palash Kumar; Mitra, Samiran; Hursthouse, Michael B.; Malik, K. M. Abdul

doi:10.1023/a:1021820729518

Cited by 28 publications

(11 citation statements)

References 16 publications

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“…A plausible mechanism for the present Cu II ‐catalyzed amination reaction is outlined in Scheme . This involves the initial formation of a Cu–1,10‐phen species from the reaction of Cu(OTf) 2 and the 1,10‐phen additive in either the monomeric or polymeric form 12. Further reaction of this Cu–1,10‐phen complex with PhINSO 2 Ar generates the putative highly reactive [Cu]NSO 2 Ar species 13.…”

Section: Resultsmentioning

confidence: 99%

Copper(II) Triflate Catalyzed Amination of 1,3‐Dicarbonyl Compounds

Ton

Himawan

Chang

et al. 2012

Chemistry A European J

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A method to prepare α,α-acyl amino acid derivatives efficiently by Cu(OTf)(2)+1,10-phenanthroline (1,10-phen)-catalyzed amination of 1,3-dicarbonyl compounds with PhI=NSO(2) Ar is described. The mechanism is thought to initially involve aziridination of the enolic form of the substrate, formed in situ through coordination to the Lewis acidic metal catalyst, by the putative copper-nitrene/imido species generated from the reaction of the metal catalyst with the iminoiodane source. Subsequent ring opening of the resultant aziridinol adduct under the Lewis acidic conditions then provided the α-aminated product. The utility of this method was exemplified by the enantioselective synthesis of a precursor of 3-styryl-2-benzoyl-L-alanine.

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Section: Resultsmentioning

confidence: 99%

Copper(II) Triflate Catalyzed Amination of 1,3‐Dicarbonyl Compounds

Ton

Himawan

Chang

et al. 2012

Chemistry A European J

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“…The characteristic strong bands of carboxylate groups appeared at 1597cm −1 (for asymmetric stretching) and 1341 cm −1 (for symmetric stretching). The difference ( ν = 256 cm −1 ) between ν asym (COO − ) and ν sym (COO − ) bands suggests the presence of chelating acetate group [26,27], which was unambiguously confirmed by the crystal Electronic spectrum 1 displays one peak at about 273 nm, which is charge transfer in origin. The UV absorption peak observed at 378 nm can be assigned to the charge transfer from ligand to the Cu(II) transition.…”

Section: Infrared Spectrummentioning

confidence: 88%

Hydrothermal synthesis, crystal structure and magnetic properties of a new one-dimensional polymer [{Cu(4,4′- bipy)(CH3COO)2}·3H2O]n

2007

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One new metal -organic coordination framework formulated as [{Cu(4,4 -bipy)(CH 3 COO) 2 }·3H 2 O] n (1) (where 4,4 -bipy = 4,4 -bipyridine) has been hydrothermally synthesised and characterised by elemental analysis, IR and electronic spectroscopy, variable temperature magnetic moment measurement and single crystal X-ray diffraction study. Single crystal X-ray analysis reveals that 1 is one dimensional polymeric compound in which acetate ligand shows both mono-and bidentate bonding mode, and 4,4 -bipy acts as bridging ligand which supports the formation of infinite chains. The global feature of the χ M T vs. T curve in 1 is characteristic of moderate antiferromagnetic interaction and the best fit parameters from 300 down to 2 K are found as J = − 78.7 cm −1 .

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“…Regarding magnetism, some common features linking structure and magnetic behavior have been relatively well established over the years, mainly when the carboxylate acts in a bridging mode, viz., complexes that present monoatomic or syn-anti bridges (Scheme 1) which usually show weak antiferromagnetic interactions, in contrast with those in which the carboxylate bridge is in a syn-syn form, where the interaction is mostly strong and antiferromagnetic. On the other hand, anti-anti modes are not so determinant, as they may produce either ferro-or antiferromagnetic coupling [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

μ-BENZENE-1,2,4,5-TETRACARBOXYLATO-κ2O1:O4)BIS-[AQUA-BIS-2-(AMINOMETHYL) PYRIDINE-κ2N,N’) NICKEL (II)] DECAHYDRATE: STRUCTURE AND MAGNETIC PROPERTIES

Atria

Parada

Baggio

et al. 2019

J. Chil. Chem. Soc.

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Benzene-1,2,4,5-tetracarboxylato-2 O 1 :O 4)bis-[aqua-bis-2-(aminomethyl) pyridine-2 N,N') nickel (II)] decahydrate, [Ni 2 (amp) 4 (btc)(H 2 O) 2 ] 10H 2 O has been synthesized and its crystal structure determined by X-ray diffraction. The complex crystallizes in the Monoclinic space group P2 1 /n with cell dimensions a= 11.0102 (10) Å, b= 21.5416 (19) Å, c= 11.0445 (10) Å and = 118.753 (1)°, and two formula units per cell (Z= 2, Z'= 0.5). The structure consists of centrosymmetric dimeric units in which the benzene tetracarboxylate anions (btc) bridge the symmetry-related nickel (II) cations, two bidentate chelating molecules of 2-(aminomethyl) pyridine and a terminal aqua ligand completing the six-fold coordination at each metal. These dimers link to each other via H-bonding to form chains parallel to [100], while the water solvates form a strongly bound 2D network parallel to (100), made up by small (R 4 4 (8)) and large (R 20 20 (40)) rings, the latter ones "pierced" by the chains of dimmers, with a profuse H-bonding interconnection between both substructures. Magnetic susceptibility measurements as a function of temperature disclose weak interdimeric exchange interactions. Fitting of these data to a dimeric model yields J=-3.5 cm-1 and g= 2.13.

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Cited by 28 publications

References 16 publications

Copper(II) Triflate Catalyzed Amination of 1,3‐Dicarbonyl Compounds

Copper(II) Triflate Catalyzed Amination of 1,3‐Dicarbonyl Compounds

Hydrothermal synthesis, crystal structure and magnetic properties of a new one-dimensional polymer [{Cu(4,4′- bipy)(CH3COO)2}·3H2O]n

μ-BENZENE-1,2,4,5-TETRACARBOXYLATO-κ2O1:O4)BIS-[AQUA-BIS-2-(AMINOMETHYL) PYRIDINE-κ2N,N’) NICKEL (II)] DECAHYDRATE: STRUCTURE AND MAGNETIC PROPERTIES

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Cited by 28 publications

References 16 publications

Copper(II) Triflate Catalyzed Amination of 1,3‐Dicarbonyl Compounds

Copper(II) Triflate Catalyzed Amination of 1,3‐Dicarbonyl Compounds

Hydrothermal synthesis, crystal structure and magnetic properties of a new one-dimensional polymer [{Cu(4,4′- bipy)(CH3COO)2}·3H2O]n

&#956;-BENZENE-1,2,4,5-TETRACARBOXYLATO-&#954;2O1:O4)BIS-[AQUA-BIS-2-(AMINOMETHYL) PYRIDINE-&#954;2N,N&#8217;) NICKEL (II)] DECAHYDRATE: STRUCTURE AND MAGNETIC PROPERTIES

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μ-BENZENE-1,2,4,5-TETRACARBOXYLATO-κ2O1:O4)BIS-[AQUA-BIS-2-(AMINOMETHYL) PYRIDINE-κ2N,N’) NICKEL (II)] DECAHYDRATE: STRUCTURE AND MAGNETIC PROPERTIES