Sulfites and Pyrosulfites of the Alkali Metals

Johnstone, H. F.; Mattern, J.A.; Fernelius, W. Conard

doi:10.1002/9780470132333.ch49

Cited by 3 publications

(4 citation statements)

References 2 publications

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“…The Raman spectrum of Na 2 SO 3 in its crystalline form is shown in Figure 6 . If sodium sulfite is allowed to crystallize from an aqueous solution at room temperature, it generates heptahydrate, [ 60 ] oxidizing in the air to form sulfates (SO 4 2− ) ions, so it is expected to detect some spectral features relative to sulfates [ 60 ].…”

Section: Resultsmentioning

confidence: 99%

Fast Detection of Different Water Contaminants by Raman Spectroscopy and Surface-Enhanced Raman Spectroscopy

Almaviva

Artuso

Giardina

et al. 2022

Sensors

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Fast monitoring of water quality is a fundamental part of environmental management and protection, in particular, the possibility of qualitatively and quantitatively determining its contamination at levels that are dangerous for human health, fauna and flora. Among the techniques currently available, Raman spectroscopy and its variant, Surface-Enhanced Raman Spectroscopy (SERS), have several advantages, including no need for sample preparation, quick and easy operation and the ability to operate on the field. This article describes the application of the Raman and SERS technique to liquid samples contaminated with different classes of substances, including nitrates, phosphates, pesticides and their metabolites. The technique was also used for the detection of the air pollutant polycyclic aromatic hydrocarbons and, in particular, benzo(a)pyrene, considered as a reference for the carcinogenicity of the whole class of these compounds. To pre-concentrate the analytes, we applied a methodology based on the well-known coffee-ring effect, which ensures preconcentration of the analytes without any pretreatment of the sample, providing a versatile approach for fast and in-situ detection of water pollutants. The obtained results allowed us to reveal these analytes at low concentrations, close to or lower than their regulatory limits.

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Section: Resultsmentioning

confidence: 99%

Fast Detection of Different Water Contaminants by Raman Spectroscopy and Surface-Enhanced Raman Spectroscopy

Almaviva

Artuso

Giardina

et al. 2022

Sensors

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show abstract

“…Along with the newly synthesized heterocycle, other subproducts were formed. We think their presence was due to the degradative processes of compound 1, as already documented [95,105,106]. Hence, a short silica pad was made to obtain the desired product in high purity.…”

Section: Procedures Bmentioning

confidence: 87%

“…Firstly, it enables the formation of the active tautomer AIMS, as described by Dittmer [91] and Krug [92]. Secondly, the complete consumption of 1 to sodium sulphoxylate in a strong basic environment avoids other collateral processes such as the auto condensation of TDO to cyclic derivatives, as reported in the literature [95]. Thirdly, the presence of water might prevent the formation of other undesired redox intermediates, because it acts as a proton donor [96].…”

Section: Procedures Bmentioning

confidence: 87%

Mechanochemistry Frees Thiourea Dioxide (TDO) from the ‘Veils’ of Solvent, Exposing All Its Reactivity

et al. 2023

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The synthesis of nitrogen-based heterocycles has always been considered essential in developing pharmaceuticals in medicine and agriculture. This explains why various synthetic approaches have been proposed in recent decades. However performing as methods, they often imply harsh conditions or the employment of toxic solvents and dangerous reagents. Mechanochemistry is undoubtedly one of the most promising technologies currently used for reducing any possible environmental impact, addressing the worldwide interest in counteracting environmental pollution. Following this line, we propose a new mechanochemical protocol for synthesizing various heterocyclic classes by exploiting thiourea dioxide (TDO)’s reducing proprieties and electrophilic nature. Simultaneously exploiting the low cost of a component of the textile industry such as TDO and all the advantages brought by a green technique such as mechanochemistry, we plot a route towards a more sustainable and eco-friendly methodology for preparing heterocyclic moieties.

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“…Nonetheless, we cannot completely rule out the presence of sodium dithionite and sodium bisulfite as reducing agents. The former can be formed by TDO degradation [38,94], and the sulfur dioxide may generate the latter in the presence of water [95]. Ultimately, adding fresh TDO to the reaction medium let the ring be closed to the corresponding aromatic heterocycle (Scheme 8, pathway 4).…”

Section: Procedures Bmentioning

confidence: 99%

Mechanochemistry Frees the Thiourea Dioxide (TDO) from the ‘Veils’ of the Solvent, Exposing All Its Reactivity

Basoccu¹,

Cuccu²,

Caboni³

et al. 2023

Preprint

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The synthesis of nitrogen-based heterocycles has always been considered essential in the development of pharmaceuticals in medicine and agriculture. This explains why various synthetic approaches have been proposed in recent decades. However, performing as methods often imply harsh conditions or the employment of toxic solvents and dangerous reagents. Mechanochemistry is undoubtedly one of the most promising technologies currently used for reducing any possible environmental impact due to the worldwide interest in developing solvent-free synthetic pathways. Following this line, we propose a renewed mechanochemical protocol for synthesizing various heterocyclic classes by exploiting the reducing proprieties and the electrophilic nature of thiourea dioxide (TDO). Simultaneously using the ready availability and low cost of a component of the textile industry such as TDO and all the advantages brought by a green technique such as mechanochemistry, we plotted the route towards a more sustainable and eco-friendly methodology for obtaining heterocyclic moieties.

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Sulfites and Pyrosulfites of the Alkali Metals

Cited by 3 publications

References 2 publications

Fast Detection of Different Water Contaminants by Raman Spectroscopy and Surface-Enhanced Raman Spectroscopy

Fast Detection of Different Water Contaminants by Raman Spectroscopy and Surface-Enhanced Raman Spectroscopy

Mechanochemistry Frees Thiourea Dioxide (TDO) from the ‘Veils’ of Solvent, Exposing All Its Reactivity

Mechanochemistry Frees the Thiourea Dioxide (TDO) from the ‘Veils’ of the Solvent, Exposing All Its Reactivity

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