Month: December 2022

Inesi, Achille published the artcileA Convenient Method for the Synthesis of Carbamate Esters from Amines and Tetraethylammonium Hydrogen Carbonate, Application of Tetraethylammonium hydrogencarbonate, the publication is Journal of Organic Chemistry (1998), 63(4), 1337-1338, database is CAplus.

Tetraethylammonium hydrogen carbonate (TEAHC), simply obtained by saturating a methanol solution of tetraethylammonium hydroxide (TEAOH) with carbon dioxide, reacts with amines in acetonitrile at room temperature affording, after the addition of a suitable alkylating reagent, the corresponding alkyl carbamates. The reaction yields (53-98% isolated products) depend on both the nature of the alkylating reagent and the nucleophilicity of the amine. Amines bearing a leaving group at the ¦Ø-position give the corresponding cyclic carbamates (48-56% isolated yields) as a result of an intramol. nucleophilic substitution; no addition of alkylating reagent is needed. The mildness of the reaction conditions and the stability of the reagent, together with its easy and cheap preparation, make this procedure a valuable alternative to the methodologies reported up to now.

Journal of Organic Chemistry published new progress about 17351-61-0. 17351-61-0 belongs to catalysis-chemistry, auxiliary class Phase Transfer Catalyst, name is Tetraethylammonium hydrogencarbonate, and the molecular formula is C9H21NO3, Application of Tetraethylammonium hydrogencarbonate.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Cesa, Stefania published the artcileTetraethylammonium hydrogen carbonate in organic synthesis: synthesis of oxazolidine-2,4-diones, Name: Tetraethylammonium hydrogencarbonate, the publication is Tetrahedron (1999), 55(1), 193-200, database is CAplus.

Oxazolidine-2,4-diones were synthesized by tetraethylammonium hydrogen carbonate (TEAHC) promoted carboxylation of secondary carboxamides bearing a leaving group at the ¦Á-position. Several oxazolidine-2,4-diones, including clin. used malidone, have been prepared in moderate to excellent yields as a results of a formal proton extraction-carboxylation-intramol. S_N2 one-pot sequence.

Tetrahedron published new progress about 17351-61-0. 17351-61-0 belongs to catalysis-chemistry, auxiliary class Phase Transfer Catalyst, name is Tetraethylammonium hydrogencarbonate, and the molecular formula is C9H21NO3, Name: Tetraethylammonium hydrogencarbonate.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Zhao, Li published the artcileToxicity evaluation of collagen hydrolysates from chrome shavings and their potential use in the preparation of amino acid fertilizer for crop growth, Recommanded Product: (S)-2-Amino-4-(methylthio)butanoic acid, the publication is Journal of Leather Science and Engineering (2022), 4(1), 2, database is CAplus.

Resource utilization of chrome shavings (CS) has attracted a lot of attention from scientists and technologists in leather industry. Especially, the collagen hydrolyzates extracted from CS are expected to find potential application values in agricultural field. However, there is no biotoxicity anal. of collagen hydrolyzates from CS. Herein, the collagen hydrolyzates with different mol. weights were produced from CS by three hydrolysis dechroming methods including alk. hydrolysis, enzymic hydrolysis and alk.-enzymic synergistic hydrolysis, and the optimal hydrolysis process of CS was designed and conducted. To evaluate their toxicity, the three collagen hydrolyzates were formulated into a nutrient solution for zebrafish development. The obtained results indicated that the hydrolyzates with low concentrations (less than 0.6 mg/mL) were safe and could promote the development for zebrafish embryos. Furthermore, the three collagen hydrolyzates were utilized as organic nitrogen sources and formulated into amino acid water-soluble fertilizers (AAWSF) including alk. type fertilizer (OH), enzymic type fertilizer (M) and alk.-enzymic type fertilizer (OH-M) for the early soilless seeding cultivation of wheat, soybean and rapeseed. It is worth mentioning that the chromium contents in the prepared AAWSF were less than 10 mg/kg, which is far less than the limit value in the standard (China, 50 mg/kg). The growth and development of seedlings (germination rate, plant height, fresh weight of leaves, soluble sugar content and chlorophyll content) were investigated. The corresponding results showed that the growth of seedlings watered with AAWSF was better compared with the other treatments, and the OH-M fertilizer had the best promoting effect on the seedlings growth and development, followed by the M and OH fertilizers. The safe toxicity assessment of the collagen hydrolyzates will expand their application scope, and the use of collagen hydrolyzates extracted from CS for seedlings growth also provides an effective and reasonable way to deal with the chromium-containing leather solid waste, which is an effective way to realize its resource utilization.

Journal of Leather Science and Engineering published new progress about 63-68-3. 63-68-3 belongs to catalysis-chemistry, auxiliary class Natural product, name is (S)-2-Amino-4-(methylthio)butanoic acid, and the molecular formula is C6H5NO, Recommanded Product: (S)-2-Amino-4-(methylthio)butanoic acid.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Zhao, Zhiming published the artcileDesign and synthesis of tweezers-like artificial receptor of aromatic heterocycles based on multiple hydrogen-bonding sites, SDS of cas: 5411-14-3, the publication is Sichuan Daxue Xuebao, Ziran Kexueban (2001), 38(3), 402-406, database is CAplus.

Eight mol. tweezers 2,6-dibenzamidopyridine, 2,6-di(4-ethoxybenzamido)pyridine, 2,2′-di(pyridine-2-aminocarbonyl)diphenyl, 1,3-di(phenoxyacetamido)pyridine, 1,2-di(phenoxyacetamido)pyridine, 1,3-di(6-benzamidopyridine-2-aminocarbonyl)benzene, 1,3-di[6-(4-nitrobenzamido)pyridine-2-aminocarbonyl]benzeene, and 1,3-di(6-benzamidopyridine-2-aminocarbonyl)pyridine were designed and synthesized by acylation. The structures of these receptors were identified by MS, ¹HNMR, and IR spectra.

Sichuan Daxue Xuebao, Ziran Kexueban published new progress about 5411-14-3. 5411-14-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2,2-(1,2-Phenylenebis(oxy))diacetic acid, and the molecular formula is C26H26N4O7, SDS of cas: 5411-14-3.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Mueller, Richard published the artcileCarbonyl fluoride as a fluorination reagent in organosilicon chemistry, Product Details of C12H10F2Si, the publication is Zeitschrift fuer Chemie (1971), 11(10), 382-4, database is CAplus.

The title reaction was investigated on a series of silanols and siloxanes at 0-20¡ã. For example, Me3SiOH gave 79% Me3SiF; Ph2Si(OH)2 gave 59% Ph2SiF2; Me3SiOMe gave 97% Me3SiF and 73% FCO2Me; Me2Si(OEt)2 gave 77.5% Me2SiF2, 86% FCO2Et, and 1.8% (EtO)2CO2H. Other examples were given; Me3SiOSiMe3 and Me3SiOPh did not react.

Zeitschrift fuer Chemie published new progress about 312-40-3. 312-40-3 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Difluorodiphenylsilane, and the molecular formula is C12H10F2Si, Product Details of C12H10F2Si.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Mueller, Richard published the artcileSilicones. LXIII. Thionyl fluoride as a fluorinating agent in organosilicon chemistry, Computed Properties of 312-40-3, the publication is Zeitschrift fuer Anorganische und Allgemeine Chemie (1963), 324(1-2), 86-9, database is CAplus.

In autoclaves at 20¡ã, SOF₂ with Me₂Si(OEt)₂, Me₃SiCl, Me₃SiOH, and Ph₂Si(OH)₂ gave 60-75% Me₂SiF₂ and SO(OEt)₂, 23% Me₃SiF, 90% Me₃SiF, and 80% Ph₂SiF, resp. SOF₂ did not fluorinate (Me₃Si)₂O.

Zeitschrift fuer Anorganische und Allgemeine Chemie published new progress about 312-40-3. 312-40-3 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Difluorodiphenylsilane, and the molecular formula is C12H10F2Si, Computed Properties of 312-40-3.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Mueller, Richard published the artcileSilicones. LXII. Sulfur tetrafluoride as a fluorinating agent in organosilicon chemistry, Application of Difluorodiphenylsilane, the publication is Zeitschrift fuer Anorganische und Allgemeine Chemie (1963), 324(1-2), 78-85, database is CAplus.

cf. CA 58, 10229g; 59, 7699h. In autoclaves, SF₄ with Me₃SiCl, (Me₃Si)₂O, and Me₃SiOH at 20¡ã gave Me₃SiF in 90, 42, and 70% yields, resp. At -50 to -20¡ã, Ph₂Si(OH)₂ and SF₄ gave 79% Ph₂SiF₂. Me₂Si(OEt)₂ and SF₄ at 20¡ã gave 77% Me₂SiF₂, EtF, and SO(OEt)₂.

Zeitschrift fuer Anorganische und Allgemeine Chemie published new progress about 312-40-3. 312-40-3 belongs to catalysis-chemistry, auxiliary class Organic Silicones, name is Difluorodiphenylsilane, and the molecular formula is C12H10F2Si, Application of Difluorodiphenylsilane.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Lubos, Marta published the artcileFunctional stapled fragments of human preptin of minimized length, Computed Properties of 71989-31-6, the publication is Organic & Biomolecular Chemistry (2022), 20(12), 2446-2454, database is CAplus and MEDLINE.

Preptin is a 34-amino-acid-long peptide derived from the E-domain of a precursor of insulin-like growth factor 2 (pro-IGF2) with bone-anabolic and insulin secretion amplifying properties. Here, we describe the synthesis, structures, and biol. activities of six shortened analogs of human preptin. Eight- and nine-amino-acid-long peptide amides corresponding to the C-terminal part of human preptin were stabilized by two types of staples to induce a higher proportion of helicity in their secondary structure. We monitored the secondary structure of the stapled peptides using CD. The biol. effect of the structural changes was determined afterwards by the ability of peptides to stimulate the release of intracellular calcium ions. We confirmed the previous observation that the stabilization of the disordered conformation of human preptin has a deleterious effect on biol. potency. However, surprisingly, one of our preptin analogs, a nonapeptide stabilized by olefin metathesis between positions 3 and 7 of the amino acid chain, had a similar ability to stimulate calcium ions’ release to the full-length human preptin. Our findings could open up new ways to design new preptin analogs, which may have potential as drugs for the treatment of diabetes and osteoporosis.

Organic & Biomolecular Chemistry published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C20H19NO4, Computed Properties of 71989-31-6.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Krut’ko, N. P. published the artcileEffect of surfactants and hydrocarbons on physicomechanical properties of granulated potassium fertilizers, SDS of cas: 2016-56-0, the publication is Vestsi Natsyyanal’nai Akademii Navuk Belarusi, Seryya Khimichnykh Navuk (2006), 72-77, database is CAplus.

The effects of granulated KCl fertilizer hydrophobization on granule water absorption and KCl solubility were studied with the aim to find treatments improving the granule transport and storage stability and resistance to caking. The granules were treated with C₁₂-C₁₆ aliphatic amines in free or salt (acetate, chloride) forms, with free fatty acids (C₄, C₅, C₆, C₇, oleic, linoleic, linolenic), with fatty acid tech. mixtures, petroleum hydrocarbons, and their combinations. Free amines and their acetate salts were more effective in hydrophobization than chloride salts; the effects also increased with the amine chain length. The fatty acids were inferior to amines in the hydrophobization effects. Combined treatments with fatty amines, fatty acids, and non-polar hydrocarbons were very effective in waterproofing the KCl granules, providing up to 60% hydrophobization and 96-97% dynamic strength.

Vestsi Natsyyanal’nai Akademii Navuk Belarusi, Seryya Khimichnykh Navuk published new progress about 2016-56-0. 2016-56-0 belongs to catalysis-chemistry, auxiliary class Active Esterification, name is Dodecylamineacetate, and the molecular formula is C14H31NO2, SDS of cas: 2016-56-0.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Zohrevandi, Mina published the artcileA nickel nanoparticle engineered CoFe₂O₄/SiO₂-NH₂@carboxamide composite as a novel scaffold for the oxidation of sulfides and oxidative coupling of thiols, Safety of 2,2′-Dithiodibenzoic acid, the publication is RSC Advances (2021), 11(24), 14717-14729, database is CAplus and MEDLINE.

A new Ni-carboxamide complex supported on CoFe₂O₄ nanoparticles (CoFe₂O_4/SiO_2-NH₂@carboxamide-Ni) was prepared The carboxamide host material unit generated cavities that stabilized the nickel nanoparticles effectively and prevented the aggregation and separation of these particles on the surface. This compound was appropriately characterized using FT-IR spectroscopy, FE-SEM, ICP-OES, EDX, XRD, TGA anal., VSM and X-ray at. mapping. The catalytic oxidation of sulfides to give sulfoxides RS=OR¹ [R = Ph, 4-BrC₆H₄, Bn, etc.; R¹ = H, Me, Ph, etc.] and oxidative coupling of thiols to give disulfides R²S-SR² [R² = Ph, 4-MeC₆H₄, Bn, etc.] in the presence of the designed catalyst was explored as a highly selective catalyst using hydrogen peroxide as a green oxidant. The easy separation, simple workup, excellent stability of the nanocatalyst, short reaction times, non-explosive materials as well as appropriate yields of the products were some outstanding advantages of this protocol.

RSC Advances published new progress about 119-80-2. 119-80-2 belongs to catalysis-chemistry, auxiliary class sulfides,Carboxylic acid,Benzene, name is 2,2′-Dithiodibenzoic acid, and the molecular formula is Al2H32O28S3, Safety of 2,2′-Dithiodibenzoic acid.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia