Catalysis-chemistry

Harmjanz, M. published the artcileNovel synthetic pathways to neutral mixed-ligand iron-sulfur clusters, Application In Synthesis of 22693-41-0, the publication is Zeitschrift fuer Naturforschung, B: Chemical Sciences (1996), 51(7), 1040-1048, database is CAplus.

The reaction of [Fe(N(SiMe₃)₂)₂] with thiols RSH, elemental S, and neutral ligands L with sulfur donor atoms (e.g. thiourea derivatives) gives [Fe₄S₄(SR)₂L₂] clusters in high yields. The structure of [Fe₄S₄(2,4,6-Pr₃C₆H₂S)₂(dpdmi)₂] (dpdmi = diisopropyldimethylimidazolethione) was determined by x-ray crystallog. When [Fe₄S₄I₄]^2- is reacted with a large excess of PMePh₂ or PMe₂Ph, [Fe₆S₆I₂(PMePh₂)₄] and [Fe₆S₆I₂(PMe₂Ph)₄], resp., are obtained in nearly quant. yield. Basket-like structures of the [Fe₆S₆]²⁺ cores were detected by x-ray structure anal. While [Fe₄S₄(SR)₄]^2- clusters do not react with phosphines at ambient temperature, 2:2 functionalized species like [Fe₄S₄(SR)₂(tmtu)₂] (tmtu = tetramethylthiourea) lead to basket-type clusters [Fe₆S₆(SR)₂(PR₃)₄].

Zeitschrift fuer Naturforschung, B: Chemical Sciences published new progress about 22693-41-0. 22693-41-0 belongs to catalysis-chemistry, auxiliary class Other Functionalization Reagent, name is 2,4,6-Triisopropylbenzenethiol, and the molecular formula is C15H24S, Application In Synthesis of 22693-41-0.

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

Lee, Yeun Jae published the artcileFlotation behavior of fluorite related to zeta-potential changes, Application of Dodecylamineacetate, the publication is Taehan Kwangsan Hakhoechi (1988), 25(3), 175-82, database is CAplus.

The effects of some collectors and modifying agents with varying pH on the ¦Æ-potential and flotation behavior of fluorite were studied. The zero point of charge (ZPC) of fluorite is located at pH 6.5. The pos. charge of the fluorite surface is increased by increasing the Ca²⁺ ion concentration while the F^– ion has almost no effect on the ¦Æ-potential. H⁺, OH^–, and Ca²⁺ are proved to act as potential-determining ions. The ZPC is shifted to the alk. range when the cationic collector dodecylammonium acetate (I) is added. The fluorite surface is charged neg. in the whole pH range in the presence of the anionic collector Na dodecyl sulfate (II). The Hallimond tube tests show that I is effective on the neg. charged surface and II on the pos. charged surface; therefore, the adsorption on the surface occurs by electrostatic attraction. In the presence of Na oleate, the fluorite is neg. charged due to the adsorption of the oleate species and the floatability is enhanced; however, the most-effective flotation is achieved in the neutral pH range at low concentration, ¡Ü10^-5M. There is little decreasing floatability up to pH 10, though the Na metasilicate concentration was increased to 10^-3M.

Taehan Kwangsan Hakhoechi 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, Application of Dodecylamineacetate.

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

Chambers, Dana R. published the artcileC-O Bond Cleavage of Alcohols via Visible Light Activation of Cobalt Alkoxycarbonyls, Name: 2,4,6-Triisopropylbenzenethiol, the publication is Organometallics (2019), 38(24), 4570-4577, database is CAplus.

A strategy for the activation of C-O bonds in alcs. via a carbonylation-homolysis-decarboxylation process is described. Using readily available Co(II) porphyrin precursors, carbonylation of simple alcs. provides access to alkoxycarbonyl Co(III) complexes. Spectroscopic, crystallog., and computational methods were used to provide structural details and an estimate for the Co-C bond dissociation energy of an alkoxycarbonylcobalt(III) complex of 39.8 kcal/mol for the 1st time. Visible light irradiation in the presence of the radical trapping agent TEMPO and a thiol reducing agent demonstrates the cleavage of the alc. C-O bond under oxidative and reductive conditions, resp. Addition of a stoichiometric reducing agent allows the use of a catalytic amount of hindered thiol for the reduction of a benzylic alc. to the corresponding hydrocarbon.

Organometallics published new progress about 22693-41-0. 22693-41-0 belongs to catalysis-chemistry, auxiliary class Other Functionalization Reagent, name is 2,4,6-Triisopropylbenzenethiol, and the molecular formula is C15H24S, Name: 2,4,6-Triisopropylbenzenethiol.

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

Wang, Jin published the artcileHydroboration Reaction and Mechanism of Carboxylic Acids using NaNH₂(BH₃)₂, a Hydroboration Reagent with Reducing Capability between NaBH₄ and LiAlH₄, Formula: C10H10O3, the publication is Journal of Organic Chemistry (2021), 86(7), 5305-5316, database is CAplus and MEDLINE.

Hydroboration reactions of carboxylic acids using sodium aminodiboranate (NaNH₂[BH₃]₂, NaADBH) to form primary alcs. were systematically investigated, and the reduction mechanism was elucidated exptl. and computationally. The transfer of hydride ions from B atoms to C atoms, the key step in the mechanism, was theor. illustrated and supported by exptl. results. The intermediates, NH₂B₂H₅, PhCH=CHCOOBH₂NH₂BH₃^–, PhCH=CHCH₂OBO, and the byproducts, BH₄^–, NH₂BH₂, and NH₂BH₃^–, were identified and characterized by ¹¹B and ¹H NMR. The reducing capacity of NaADBH was found between that of NaBH₄ and LiAlH₄. We have thus found that NaADBH is a promising reducing agent for hydroboration because of its stability and easy handling. These reactions exhibit excellent yields and good selectivity, therefore providing alternative synthetic approaches for the conversion of carboxylic acids to primary alcs. with a wide range of functional group tolerance.

Journal of Organic Chemistry published new progress about 2051-95-8. 2051-95-8 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ketone, name is 3-Benzoylpropionicacid, and the molecular formula is C9H8BNO2, Formula: C10H10O3.

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

Sen, A. B. published the artcileSearch for organic fungicides: chemical constitution and fungicidal activity, Related Products of catalysis-chemistry, the publication is Journal of the Science of Food and Agriculture (1952), 526-31, database is CAplus.

The results are presented of studies on the fungicidal action of a number of compounds (cf. C.A. 46, 7271e) on Aspergillus niger, employing the agar growth method. Most of the compounds were highly toxic to the fungus. The introduction of an addnl. Br atom imparted fair toxicity to substituted bromoamides, in contrast to the lack of toxicity of the corresponding unhalogenated amides. The dibromoamides did not, however, have exceptionally strong fungicidal activity, having only slightly more activity than the monobromoamides. The esters of cresotinic acid were fairly effective, as expected since esters of p-HOC₆H₄CO₂H are toxic and alkyl substitution increases toxicity. The ethers of cresotinic acid esters were considerably more active than the hydroxy esters. With the higher ether-esters of cresotinic acids, a decrease in fungicidal activity occurred in compounds containing more than 12 C atoms, the hexyl ether of o-cresotinic acid butyl ester having least activity. Generally, with ether-esters of cresotinic acid the o-derivatives were less effective than the m- and p-derivatives; exceptions were noted. Substituted phenoxy fatty acids acted as fungicides at relatively low dilutions, some possessing fairly high toxicity. All of these compounds inhibited growth at a concentration of 1:10,000, maximum inhibition being exerted by p-tert-butylphenoxyacetic acid, while at 1:1,000,000 dilution, all of the compounds stimulated growth; intermediate effects were also observed. Hg derivatives of phenoxy fatty acids, especially Hg derivatives of aryloxyacetic acids, were extremely toxic to the fungus. The toxicity of most of the compounds fell rapidly as the concentration was lowered.

Journal of the Science of Food and Agriculture published new progress about 1798-04-5. 1798-04-5 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(4-(tert-Butyl)phenoxy)acetic acid, and the molecular formula is C19H14O2, Related Products of catalysis-chemistry.

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

Sen, A. B. published the artcileOrganic fungicides. IV. Preparation of some aryloxy-fatty acids and their mercury derivatives, COA of Formula: C12H16O3, the publication is Journal of the Indian Chemical Society (1951), 469-70, database is CAplus.

The aryloxy aliphatic acids were prepared by heating the appropriate phenol (1 mol.), the halogenated fatty acid (1 mol.) and NaOH (2 mols.) at 100¡ã for 3-6 h., and either crystallized from 10% MeOH or petr. ether or distilled in vacuo. The following acids are reported: 4-EtC₆H₄OCH₂CO₂h (I) m. 91¡ã; 3-EtC₆H₄OCH₂CO₂H (II), m. 73¡ã; 4-Me₃CC₆H₄OCH₂CO₂H (III), m. 80¡ã; 4-Me₂(Et)CC₆H₄OCH₂CO₂H (IV), m. 50¡ã; 4-EtC₆H₄OCH₂CH₂CO₂H (V), m. 50¡ã; 3-EtC₆H₄OCH₂CH₂CO₂H (VI), m. 51¡ã, b₁₂ 188¡ã; 4-Me₃CC₆H₄OCH₂CH₂CO₂H (VII), m. 51-2¡ã; 4-Me₂(Et)CC₆H₄OCH₂CH₂CO₂H (VIII), b₃ 210¡ã; 4-Me₃CC₆H₄O(CH₂)₃CO₂H (IX), 84, b₂₀ 210¡ã; 4-Me₂(Et)CC₆H₄O(CH₂)₃CO₂H (X), m. 54¡ã, b₁₈ 198¡ã. Equimol. amounts Hg(OAc)₂ in H₂O and the aryloxy aliphatic acids in dilute AcOH, or HgO in 50% AcOH and the aryloxy aliphatic acid in 50% alc. were heated 1-6 h. on a steam bath until a sandy powder separated ((RCO₂)₂Hg compound corresponding to the above acids and m.p.): I, 224¡ã (with decomposition); II, 198¡ã (with decomposition); III, 192¡ã; IV, 160¡ã; V, 227¡ã; VI, 234¡ã (with decomposition); VII, 248¡ã (with decomposition); VIII, 228¡ã; IX, 238¡ã (with decomposition); and X, 240¡ã (with decomposition).

Journal of the Indian Chemical Society published new progress about 1798-04-5. 1798-04-5 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(4-(tert-Butyl)phenoxy)acetic acid, and the molecular formula is C3H8N2S, COA of Formula: C12H16O3.

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

Kharalkar, Shilpa S. published the artcileIdentification of novel allosteric regulators of human-erythrocyte pyruvate kinase, Safety of 2,2-(1,2-Phenylenebis(oxy))diacetic acid, the publication is Chemistry & Biodiversity (2007), 4(11), 2603-2617, database is CAplus and MEDLINE.

Erythrocyte pyruvate kinase (PK) is an important glycolytic enzyme, and manipulation of its regulatory behavior by allosteric modifiers is of interest for medicinal purposes. Human-erythrocyte PK was expressed in Rosetta cells and purified on an Ni-NTA column. A search of the small-mols. database of the National Cancer Institute (NCI), using the UNITY software, led to the identification of several compounds with similar pharmacophores as fructose-1,6-bisphosphate (FBP), the natural allosteric activator of the human kinases. The compounds were subsequently docked into the FBP binding site using the programs FlexX and GOLD, and their interactions with the protein were analyzed with the energy-scoring function of HINT. Seven promising candidates, compounds 1-7, were obtained from the NCI, and subjected to kinetics anal., which revealed both activators and inhibitors of the R-isoenzyme of PK (R-PK). The allosteric effectors discovered in this study could prove to be lead compounds for developing medications for the treatment of hemolytic anemia, sickle-cell anemia, hypoxia-related diseases, and other disorders arising from erythrocyte PK malfunction.

Chemistry & Biodiversity 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 C10H10O6, Safety of 2,2-(1,2-Phenylenebis(oxy))diacetic acid.

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

Rafiee, Ezzat published the artcileSynthesis and characterization of carbon@HPW core/shell nanorod using potato as a novel precursor: Efficient catalyst for C-N coupling reaction, Application In Synthesis of 140-28-3, the publication is Arabian Journal of Chemistry (2019), 12(8), 3324-3335, database is CAplus.

Carbon support with nanorod (CSN) structure was synthesized by natural potato as green and very cheap source via hydrothermal method. A novel type of core/shell nanorod catalyst was synthesized by the immobilization of 12-tungstophosphoric acid (HPW) on the surface of the CSN (C@HPW). Characterization of the core/shell nanorod catalyst was carried out using transmission electron microscopy (TEM), X-ray diffraction (XRD) pattern, energy dispersive X-ray (EDX) spectroscopy, Fourier transform IR (FTIR) spectrophotometry, and Raman spectrophotometer. The TEM results showed that morphol. of carbon catalyst support was changed from nanorod to core/sell nanorod by the immobilization of HPW. The characterization data derived from FTIR spectroscopy revealed that HPW on the support exists in the Keggin structure. The C@HPW core/shell nanorod was found to be a unique, effective, and eco-friendly catalyst for the C-N coupling reactions for a broad range of aryl and alkyl amines and alcs. under aerobic conditions at room temperature The excellent conversion at low reaction time showed that the catalyst was strong and sufficient sites, which were responsible for its catalytic performance. The acidity measurements of CSN and C@HPW by means of potentiometric titration with n-butylamine was used to estimate their relative acid strength. Leaching of the HPW from the CSN was minimized by optimization of calcination temperature The reused catalyst for at least five repeating cycles showed excellent activity.

Arabian Journal of Chemistry published new progress about 140-28-3. 140-28-3 belongs to catalysis-chemistry, auxiliary class Benzenes, name is N1,N2-Dibenzylethane-1,2-diamine, and the molecular formula is C16H20N2, Application In Synthesis of 140-28-3.

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

Reynard, Guillaume published the artcileProtecting-group-free synthesis of hydroxyesters from amino alcohols, Category: catalysis-chemistry, the publication is Chemical Communications (Cambridge, United Kingdom) (2020), 56(74), 10938-10941, database is CAplus and MEDLINE.

The synthesis of hydroxyesters such as RCOOCH₂(CH)_nOH [R = MeC¡ÔC, 2-furyl, Ph, etc.; n = 1,2,3,4,7] from carboxylic acids RCOOH and unprotected amino alcs. H₂NCH₂(CH)_nOH in both continuous flow and batch processes was reported. The formation of a transient diazonium species with a dinitrite reagent was key in this transformation. The reaction conditions were compatible with a variety of functional groups.

Chemical Communications (Cambridge, United Kingdom) published new progress about 2051-95-8. 2051-95-8 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ketone, name is 3-Benzoylpropionicacid, and the molecular formula is C10H10O3, Category: catalysis-chemistry.

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

Priyadarshini, S. published the artcileCopper catalyzed cross-coupling reactions of carboxylic acids: an expedient route to amides, 5-substituted ¦Ã-lactams and ¦Á-acyloxy esters, HPLC of Formula: 1772-76-5, the publication is RSC Advances (2013), 3(40), 18283-18287, database is CAplus.

A convenient and recyclable catalytic protocol for the synthesis of N,N-di-Me substituted amides, 5-substituted ¦Ã-lactams, and ¦Á-acyloxy ethers from carboxylic acids using CuO nanoparticles and TBHP is described.

RSC Advances published new progress about 1772-76-5. 1772-76-5 belongs to catalysis-chemistry, auxiliary class Benzenes, name is (E)-3-(3-Nitrophenyl)acrylic acid, and the molecular formula is C9H7NO4, HPLC of Formula: 1772-76-5.

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