Day: December 30, 2022

Ferric hydroxide supported gold subnano clusters or quantum dots: enhanced catalytic performance in chemoselective hydrogenation was written by Liu, Lequan;Qiao, Botao;Ma, Yubo;Zhang, Juan;Deng, Youquan. And the article was included in Dalton Transactions in 2008.Category: tetrahydropyran This article mentions the following:

Ferric hydroxide supported Au subnano-clusters were prepared via modified co-precipitation without any calcination. High resolution TEM (HRTEM), x-ray diffraction, and XPS were used to study the structure and chem. states of these Au catalysts. No Au species could be observed in the HRTEM image nor from the x-ray diffraction pattern, suggesting that the size of the Au species in and on the ferric hydroxide support was less than or around 1 nm. Chemoselective hydrogenation of aromatic nitro compounds and α,β-unsaturated aldehydes was selected as a probe reaction to examine the catalytic properties of this catalyst. Under the same reaction conditions, such as 100° and 1 MPa H₂ in the hydrogenation of aromatic nitro compounds, a 96-99% conversion (except for 4-nitrobenzonitrile) with 99% selectivity were obtained over the ferric hydroxide supported Au catalyst, and the TOF [turnover frequency] was 2-6 times higher than that of the corresponding ferric oxide supported catalyst with 3-5 nm size Au particles. For further evaluation of this Au catalyst in the hydrogenation of citral and cinnamaldehyde, selectivity towards unsaturated alcs. was 2-20 times higher than that of the corresponding ferric oxide Au catalyst. In the experiment, the researchers used many compounds, for example, 5,6-Dihydro-2H-pyran-3-carbaldehyde (cas: 13417-49-7Category: tetrahydropyran).

5,6-Dihydro-2H-pyran-3-carbaldehyde (cas: 13417-49-7) belongs to tetrahydropyran derivatives. Tetrahydropyrans and furans principally constitute as a central motif in diverse medicinally privileged molecules. 2-(Arylmethylene)cyclopropylcarbinols could be converted to the corresponding tetrahydropyrans stereoselectively in the presence of Brønsted acids under mild conditions. A plausible Prins-type reaction mechanism has been proposed.Category: tetrahydropyran

Referemce:
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

Silver Flowerlike Structures for Surface-Enhanced Raman Spectroscopy was written by Tsutsumanova, Gitchka G.;Todorov, Neno D.;Russev, Stoyan C.;Abrashev, Miroslav V.;Ivanov, Victor G.;Lukoyanov, Alexey V.. And the article was included in Nanomaterials in 2021.HPLC of Formula: 14431-43-7 This article mentions the following:

Micro- and nanoflowers are a class of materials composed of particles with high surface-to-volume ratio. They have been extensively studied in the last decade due to simple preparation protocols and promising applications in biosensing, as drug delivery agents, for water purification, and so on. Flowerlike objects, due to their highly irregular surface, may act also as plasmonic materials, providing resonant coupling between optical waves and surface plasmon excitations. This fact allows us to infer the possibility to use micro- and nanoflowers as effective surface-enhanced Raman scattering (SERS) substrate materials. Here, we report on the design and Raman enhancement properties of silver flowerlike structures, deposited on aluminum surface. A simple and cost-effective fabrication method is described, which leads to SERS substrates of high developed surface area. The morphol. of the silver flowers on a nanoscale is characterized by self-organized quasiperiodic stacks of nanosheets, which act as plasmonic cavity resonators. The substrates were tested against rhodamine-6G (R6G) water solutions of concentration varying between 10-3 M and 10-7 M. Optimal SERS enhancement factors of up to 105 were established at R6G concentrations in the 10-6-10-7 M range. In the experiment, the researchers used many compounds, for example, (2S,3R,4S,5S,6R)-6-(Hydroxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetraol hydrate (cas: 14431-43-7HPLC of Formula: 14431-43-7).

(2S,3R,4S,5S,6R)-6-(Hydroxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetraol hydrate (cas: 14431-43-7) belongs to tetrahydropyran derivatives. Tetrahydropyrans are also used as important solvents, as chemical intermediate and as monomer for ring-opening polymerization. The bismuth chloride-assisted cross-cyclization between homoallylic alcohols and epoxides provided various benzyl tetrahydropyran derivatives. The reaction afforded good yields of desired products and occurred under mild conditions.HPLC of Formula: 14431-43-7

Referemce:
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

Nonamethinecyanines with cyclic groups in the polymethine chain was written by Slominskii, Yu. L.;Radchenko, I. D.;Efimenko, N. I.;Tolmachev, A. I.. And the article was included in Ukrainskii Khimicheskii Zhurnal (Russian Edition) in 1980.Formula: C6H8O2 This article mentions the following:

Six bridged tetracarbocyanines (I; R = H or RR = benzo; R¹ = Me, Et; X = I, ClO₄; X¹ = S, CMe₂; X² = direct link, CH₂, O) with λ_max ranging from 855 to 915 nm were prepared by condensation of the resp. II with heterocyclic quaternary compounds The II were prepd from PhNMeCH:CHCH:N⁺MePh I^– [63899-31-0] and the appropriate cyclic aldehydes. The (CH₂)₂, (CH₂)₃, and CH₂OCH₂ bridges in I cause bathochromic shifts of 45, 128 and 15 nm, resp. In the experiment, the researchers used many compounds, for example, 5,6-Dihydro-2H-pyran-3-carbaldehyde (cas: 13417-49-7Formula: C6H8O2).

5,6-Dihydro-2H-pyran-3-carbaldehyde (cas: 13417-49-7) belongs to tetrahydropyran derivatives. Tetrahydropyrans are also used as important solvents, as chemical intermediate and as monomer for ring-opening polymerization. The reaction of tertiary 1,4- and 1,5-diols with cerium ammonium nitrate at room temperature gives tetrahydrofuran and tetrahydropyran derivatives in high yield and stereoselectivity. Various fragrant compounds have been synthesized using this method.Formula: C6H8O2

Referemce:
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

Studies on bioethanol production with thermo tolerant yeast isolates, their co-cultures using african wild cocoyam as feedstock was written by Chukwudi, I. Nnamchi;OkeChukwu, U. Nwachi;Ifeanyi, A. Ndubuisi;Onyetugo, C. Amadi. And the article was included in Asian Journal of Biotechnology and Bioresource Technology in 2021.Synthetic Route of C6H14O7 This article mentions the following:

In this work different ways of optimally producing bioethanol at various pH with thermotolerant yeasts, their cocultures using a non-human edible starchy food as feedstock was examined African wild cocoyam, Xanthosoma roseum, sourced from abandoned farmlands in Obukpa, Nsukka, Nigeria was used as the substrate, while strains of Kluyveromyces marxianus, Pichia stipitis were used to ferment them. First the tubers were gelatinized by boiling under pressure above 100°C before hydrolysis with concentrated H₂SO₄. The hydrolyzates were then fermented at 35°C with the thermotolerant yeasts for five days at different pH. Results obtained showed that gelatinized sample of the substrate gave optimum glucose yield when hydrolyzed with 1M H₂SO₄ for 60 min. Kluyveromyces marxianus produced more ethanol than Pichia stipitis at all the four fermentation pH values tested. However, optimum ethanol production was obtained when the two yeast strains were used as coculture at pH 4.5. The peak time for ethanol production was 96 h for the individual yeast cultures while that of their coculture was 72 h. The results of the study indicated that wild cocoyam is an excellent feedstock for bioethanol production with many advantages including being nonedible, thereby eliminating concerns for food security, containing high amount of carbohydrate. The study also revealed that fermenting sugar hydrolyzates with a coculture of microorganisms during bioethanol production is a more efficient process than using individual cultures. In the experiment, the researchers used many compounds, for example, (2S,3R,4S,5S,6R)-6-(Hydroxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetraol hydrate (cas: 14431-43-7Synthetic Route of C6H14O7).

(2S,3R,4S,5S,6R)-6-(Hydroxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetraol hydrate (cas: 14431-43-7) belongs to tetrahydropyran derivatives. Dihydropyrans and tetrahydropyrans are examples of cyclic ethers widespread in nature. 2-(Arylmethylene)cyclopropylcarbinols could be converted to the corresponding tetrahydropyrans stereoselectively in the presence of Brønsted acids under mild conditions. A plausible Prins-type reaction mechanism has been proposed.Synthetic Route of C6H14O7

Referemce:
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics

Thermal behavior of carbohydrates studied by heat flow calorimetry was written by Raemy, A.;Schweizer, T. F.. And the article was included in Journal of Thermal Analysis in 1983.Application of 14431-43-7 This article mentions the following:

Heat flow calorimetry was used to study the thermal behavior of different carbohydrates between 20° and 270°. The samples were analyzed by heating in sealed cells. The temperature range in which exothermic reactions, due to thermal decomposition, occurred varied widely depending on the type of carbohydrate investigated. Reaction enthalpies of 44 sugars and polysaccharides are given. Endothermic phenomena, such as fusion of vaporization of crystallized water, were also observed; fusion temperatures and enthalpies of 34 sugars and sugar alcs. are listed. Calorimetric curves showing crystallization of amorphous sucrose, cellobiose and lactose are also presented. In the experiment, the researchers used many compounds, for example, (2S,3R,4S,5S,6R)-6-(Hydroxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetraol hydrate (cas: 14431-43-7Application of 14431-43-7).

(2S,3R,4S,5S,6R)-6-(Hydroxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetraol hydrate (cas: 14431-43-7) belongs to tetrahydropyran derivatives. Tetrahydropyran is an important raw material and intermediate used in Organic Synthesis, Pharmaceuticals, Agrochemicals and dyestuff. 2-(Arylmethylene)cyclopropylcarbinols could be converted to the corresponding tetrahydropyrans stereoselectively in the presence of Brønsted acids under mild conditions. A plausible Prins-type reaction mechanism has been proposed.Application of 14431-43-7

Referemce:
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics