Studies on Several Fluorescent Brightening Agents for Synthetic Fibers

Maruyama, Takehito; Koga, Joichi; Kuroki, Nobuhiko; Konishi, Kenzô

doi:10.1246/nikkashi1898.65.7_1071

Cited by 3 publications

(2 citation statements)

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“…IR (cm −1 ): 3495 (OH 2 ), 1590, 1560 (C=O), 1481, 1424, 1383 (amide), 1278 (CH), 1148, 1088, 960, 760 (py) cm −1 . UV-Vis spectrum (EtOH): 206 nm (e = 60 000 dm 3 mol −1 cm −1 ), 264 (28,600), 644 (160), 735sh (150). The minor blue product appears to be the 1 : 1 complex; FAB MS: m/z 410 (CuL 1 ), 348 (L 1 ).…”

Section: Bis(26-bis[n-(2 -Pyridinylmethyl)carbamido]pyridine)dicopper...mentioning

confidence: 99%

“…These include uses as reagents for heavy metal selection and or removal from water, 21-23, 32 electroluminescent devices, 24 tryptase inhibitors, 25 artificial enzymes, 26 catalysts for aldehyde hydrophosphonylation, 27 and as brightening agents for synthetic fibres. 28 H 2 L 1 is reportedly efficient as an oxygenation catalyst in concert with cobalt(II) acetate, 29 and as an ionophore in the polymer membrane of a copper(II)-selective electrode. 30 The close analogue (H 2 L 2 ), as the [Co III (L 2 )(OOR)] complex, is effective in the catalytic oxidation of hydrocarbons, 12,31 and H 2 L 2 along with cobalt(II) acetate catalyses the epoxidation of olefins and the selective oxygenation of phenols to quinones.…”

Section: Introductionmentioning

confidence: 99%

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Complexes of 2,6-bis[N-(2′-pyridylmethyl)carbamyl]pyridine: formation of mononuclear complexes, and self-assembly of double helical dinuclear and tetranuclear copper(ii) and trinuclear nickel(ii) complexes

et al. 2005

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The potentially pentadentate ligand 2,6-bis[N-(2'-pyridylmethyl)carbamyl]pyridine (H2L1), readily prepared from reaction of a diester of pyridine-2,6-dicarboxylic acid (H2dipic) and 2-aminomethylpyridine (ampy), shows limited tendency to form 1:1 M:L complexes with labile metal ions, although [CuL1] and [NiL1] were observed as minor species, the latter characterized by a crystal structure analysis. A mononuclear complex formed with inert Co(III) was characterized by a crystal structure as the neutral 1:2 complex [Co(L1)(HL1)] with two ligands acting as tridentate ligands, one coordinated by the central pyridine and its two flanking deprotonated amido groups, and the other by the central pyridine, one amido and one terminal pyridine group, with the remaining poorly coordinating protonated amide remaining unbound along with other terminal pyridine groups. Fe(III) is known to form a symmetrical 1:2 complex, but that complex is anionic due to binding of all four deprotonated amido groups; the unsymmetrical neutral Co(III) complex converts into a symmetrical anionic species only on heating for hours in aqueous base in the presence of activated carbon. The most remarkable tendency of H2L1, however, is towards the formation of robust double helical complexes: a dinuclear Cu(II) complex [Cu2L1(2)] forms, as well as a trinuclear Ni(II) complex [Ni(3)(L1)2(OAc)2(MeOH)2]. Moreover, in the presence of added H2dipic, the tetranuclear complex [Cu4(L1)2(dipic)2(OH2)2] is obtained. All helical complexes have been characterized by X-ray crystal structure analyses, and all crystals feature a racemic mixture of left- and right-handed double helices stabilized by inter-ligand pi-stacking (inter-ring distances of 3.2-3.8 A) of ligands which each span several metal ions. Using the chelating ligand pentane-2,4-dione (acac), each of the two pairs of adjacent monodentate ligands in [Ni3(L1)2(OAc)2(OH2)2] have been shown to be available for substitution without destroying the helical structure, to form [Ni3(L1)2(acac)2], also characterized by a crystal structure.

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Section: Bis(26-bis[n-(2 -Pyridinylmethyl)carbamido]pyridine)dicopper...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Complexes of 2,6-bis[N-(2′-pyridylmethyl)carbamyl]pyridine: formation of mononuclear complexes, and self-assembly of double helical dinuclear and tetranuclear copper(ii) and trinuclear nickel(ii) complexes

et al. 2005

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Eine einfache Methode zur Herstellung von Benzoxazolen

Šeha¹,

Weis²

1980

Helvetica Chimica Acta

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A Facile Method for the Synthesis of Benzoxazoles The preparation of benzoxazoles by a facile one‐pot reaction is reported. The reaction of carboxylic acids with 2‐chloro‐N‐methyl‐Δ1‐pyrrolinium chloride in an excess of N‐methyl‐2‐pyrrolidone afforded carboxylic acid chlorides which were converted subsequently to their 2‐hydroxyanilides by addition of 2‐aminophenols. Cyclization of the 2‐hydroxy‐anilides at elevated temperatures furnished the benzoxazoles in high yield and purity.

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