Accuracy in Gravimetric Determination of Nitrate and Nitrite as Nitron Nitrate

Hioki, Akiharu; Watanabe, Tsutomu; Terajima, Kuniko; Fudagawa, Noriko; Kubota, Masaaki; Kawase, Akira

doi:10.2116/analsci.6.757

Cited by 12 publications

(8 citation statements)

References 18 publications

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“…coupled 13 C NMR spectroscopy. Although tautomeric equilibrium between mesoionic and carbene forms is peculiar for Nitron-type compounds, [22] both Nitron and ATPr in DMSO solution, according to NMR data, exist predominantly in the mesoionic form depicted in Scheme 1 for ATPr.…”

Section: Synthesis and Structure Of New Nitron-type Nhc-proligands An...mentioning

confidence: 99%

Base‐Ionizable Anionic NHC Ligands in Pd‐catalyzed Reactions of Aryl Chlorides

Chernenko,

Baydikova,

Kutyrev

et al. 2024

ChemCatChem

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Aryl chlorides, due to their affordability and accessibility, are preferred reagents in Pd‐catalyzed arylation reactions. However, the reactivity of aryl chlorides is often reduced compared to aryl bromides and iodides due to the significantly higher barriers of the oxidative addition stage. This research introduces a novel design for NHC ligands, which notably enhances the efficiency of Pd/NHC catalytic systems in reactions where oxidative addition of aryl chloride is the rate‐limiting step. This design leverages a synergy between specific steric characteristics and the anionic nature of the newly fashioned 1,2,4‐triazol‐5‐ylidene ligands. These ligands, inspired by Nitron‐type designs, can be ionized under basic conditions due to their NH‐acidic aryl(alkyl)amino groups. Detailed experimental and DFT studies revealed that the deprotonation of these NHCs promotes electron donation to the metal center, promoting the oxidative addition of aryl chloride. The specially optimized ATPr ligand, featuring 2,6‐diisopropylphenyl groups, displayed remarkable catalytic efficacy in the Suzuki‐Miyaura reaction and improved outcomes in ketone α‐arylation and Buchwald‐Hartwig reactions with unactivated aryl chlorides. The insights and strategies established in this study provide rational considerations for further advancements in NHC designs and their applications in metal‐catalyzed reactions.

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Section: Synthesis and Structure Of New Nitron-type Nhc-proligands An...mentioning

confidence: 99%

Base‐Ionizable Anionic NHC Ligands in Pd‐catalyzed Reactions of Aryl Chlorides

Chernenko,

Baydikova,

Kutyrev

et al. 2024

ChemCatChem

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show abstract

“…The density of antimony(III) oxinate crystal was measured at 24.9˚C with a Hubbard type pycnometer; measurement and calculation were made in the same way as reported in the previous paper. 20 Then the saturated solution of the crystal was used as a measurement medium instead of water, since the solubility of the crystal was not negligible. The density of the crystal was obtained as 1.59 g cm -3 .…”

Section: Apparatusmentioning

confidence: 99%

What is the Weighing Form in Gravimetric Determination of Antimony(III) with Oxine?

Hioki

2004

ANAL. SCI.

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“…The concentration of nitrate ions left in the filtrate of the nitron nitrate precipitate was corrected on the basis of the measurement by ion chromatography. Moreover, NIMC studied a way in which nitrite ions were oxidized to nitrate ions and in which there was no interference with the precipitation with nitron [12].…”

Section: Standard Solulionsmentioning

confidence: 99%

Development and supply system of reference materials based on the Measurement Law in Japan

Kubota

Kato

Hioki

et al. 1997

Accreditation and Quality Assurance

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Analytical instruments used for measurements of air and water pollution are calibrated by using reference materials such as standard gases and standard solutions. In Japan, since the middle of the 1970s, those reference materials which are traceable to the national standards maintained at national research institutes have been supplied to users by reference material producers. In order to establish the primary standards and to secure the traceability from the working standards to the national ones, various analytical methods such as coulometric, titrimetric and gravimetric analyses for purity determination and highly sensitive atomic spectrometry for trace analysis have been developed as the primary methods and reference methods. The Japanese Measurement Law, revised in 1992, has introduced a new traceability system in which a public organization, a "designated calibration body", can also prepare and maintain the national standards under the advice and instruction of national research institutes. The designated calibration body can provide calibration services to reference material producers (accredited calibration bodies) by using the national standards. The reference materials supplied in conformity with the traceability system include standard gases, pH standard solutions, metal standard solutions and non-metal ion standard solutions.

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Accuracy in Gravimetric Determination of Nitrate and Nitrite as Nitron Nitrate

Cited by 12 publications

References 18 publications

Base‐Ionizable Anionic NHC Ligands in Pd‐catalyzed Reactions of Aryl Chlorides

Base‐Ionizable Anionic NHC Ligands in Pd‐catalyzed Reactions of Aryl Chlorides

What is the Weighing Form in Gravimetric Determination of Antimony(III) with Oxine?

Development and supply system of reference materials based on the Measurement Law in Japan

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