Catalysis-chemistry

Wei, Duo published the artcileManganese catalyzed reductive amination of aldehydes using hydrogen as a reductant, Quality Control of 140-28-3, the publication is Chemical Communications (Cambridge, United Kingdom) (2018), 54(34), 4302-4305, database is CAplus and MEDLINE.

A one-pot two-step procedure was developed for the alkylation of amines via reductive amination of aldehydes using mol. dihydrogen as a reductant in the presence of a manganese pyridinyl-phosphine complex as a pre-catalyst. After the initial condensation step, the reduction of imines formed in-situ was performed under mild conditions (50-100¡ã) with 2 mol% of catalyst and 5 mol% of tBuOK under 50 bar of hydrogen. Excellent yields (> 90%) were obtained for a large combination of aldehydes and amines (40 examples), including aliphatic aldehydes and amino-alcs.

Chemical Communications (Cambridge, United Kingdom) 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 C9H17NO, Quality Control of 140-28-3.

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

Arafa, Reem K. published the artcileSynthesis, DNA Affinity, and Antiprotozoal Activity of Fused Ring Dicationic Compounds and Their Prodrugs, Related Products of catalysis-chemistry, the publication is Journal of Medicinal Chemistry (2005), 48(17), 5480-5488, database is CAplus and MEDLINE.

Dicationic guanidine, N-alkylguanidine, and reversed amidine derivatives of fused ring systems (e.g. I, II) have been synthesized from their corresponding bis-amines. DNA binding studies suggest that the diguanidines and the N-alkyl diguanidine fluorenes bind in the minor groove in a manner similar to that of the previously reported dicationic carbazole derivatives The diguanidines and the N-alkyl diguanidines showed promising in vitro activity against both Trypanosoma brucei rhodesiense and Plasmodium falciparum. Promising in vivo biol. results were obtained for the dicationic N-isopropylguanidino-9H-fluorene (I), giving 4/4 cures of the treated animals in the STIB900 animal model for African trypanosomiasis. The N-Me analog showed high activity as well. In addition, with the goal of enhancing the oral bioavailability, two novel classes of potential guanidine prodrugs were prepared The N-alkoxyguanidine derivatives and were not effective as prodrugs. In contrast, a number of the carbamates showed promising activity. The value of the carbamate prodrugs was clearly demonstrated by the results for II, which gave 4/4 cures on oral administration in the STIB900 mouse model.

Journal of Medicinal Chemistry published new progress about 6084-58-8. 6084-58-8 belongs to catalysis-chemistry, auxiliary class Salt,Amine,Aliphatic hydrocarbon chain, name is O-Isobutylhydroxylamine hydrochloride, and the molecular formula is C4H12ClNO, Related Products of catalysis-chemistry.

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

Sah, Peter P. T. published the artcileNote on the synthesis of 2-methyl-1,4-naphthoquinone (synthetic vitamin K) from benzene and citric or d-tartaric acid, Application of 2-Methyl-4-phenylbutanoic acid, the publication is Berichte der Deutschen Chemischen Gesellschaft [Abteilung] B: Abhandlungen (1940), 1430-2, database is CAplus.

cf. C. A. 35,447.5. The stages of the synthesis are: citric acid or d-tartaric acid ¡ú itaconic + citraconic acids ¡ú methylsuccinic acid ¡ú methylsuccinic anhydride, m. 36¡ã, b₂₀ 155-60¡ã ¡ú ¦Á-methyl-¦Â-benzoylpropionic acid, needles from alc., m. 136¡ã ¡ú ¦Á-methyl-¦Ã-phenylbutyric acid, colorless oil, b₂₀ 178-82¡ã ¡ú ¦Á-methyl-¦Ã-phenylbutyryl chloride, oil, b₂₀ 132-5¡ã ¡ú 2-methyl-¦Á-tetralone, oil, b₂₀ 135-40¡ã ¡ú 2-methyl-1,2,3,4-tetrahydronaphthalene, oil, b₆₀ 228-30¡ã ¡ú 2-methylnaphthalene ¡ú 2-methyl-1,4-naphthoquinone ¡ú 2-methyl-1,4-dibenzoylnaphthohydroquinone, m. 179-80¡ã.

Berichte der Deutschen Chemischen Gesellschaft [Abteilung] B: Abhandlungen published new progress about 1949-41-3. 1949-41-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene, name is 2-Methyl-4-phenylbutanoic acid, and the molecular formula is C11H14O2, Application of 2-Methyl-4-phenylbutanoic acid.

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

Bandara, Tharindu published the artcileSeawater browning alters community composition and reduces nutritional quality of plankton in a subarctic marine ecosystem, SDS of cas: 6217-54-5, the publication is Canadian Journal of Fisheries and Aquatic Sciences (2022), 79(8), 1291-1301, database is CAplus.

Inflows of colored terrestrial organic matter cause seawater browning and reduced phytoplankton production in subarctic coastal ecosystems, potentially deteriorating the nutritional quality of marine food webs. We analyzed the fatty-acid (FA) compositions of seston and the zooplankton taxa Eurytemora affinis and cladocerans at three locations of the northern Baltic Sea. At the coastal and northerly locations, salinity and phosphorus concentrations were low, while concentrations of humic substances (i.e., terrestrial organic matter) were high. The southerly location showed the opposite trend. The ratio between alga-specific ¦Ø3 polyunsaturated FA and terrigenous monounsaturated FA (MUFA) in Eurytemora decreased from south to north, as did the ratio between the alga-specific docosahexaenoic acid (DHA) and terrigenous MUFA in cladocerans. With increasing humic substances, the biomass of DHA-rich phytoplankton decreased and the zooplankton MUFA content increased. Our results indicate that colored terrestrial organic matter alters the phytoplankton composition, consequently affecting the zooplankton nutritional quality.

Canadian Journal of Fisheries and Aquatic Sciences published new progress about 6217-54-5. 6217-54-5 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Aliphatic hydrocarbon chain,Metabolic Enzyme,RAR/RXR,Natural product, name is Docosahexaenoic Acid, and the molecular formula is C22H32O2, SDS of cas: 6217-54-5.

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

Weintraub, Robert L. published the artcileRelation between molecular structure and physiological activity of plant-growth regulators. II. Formative activity of phenoxyacetic acids, Application In Synthesis of 1798-04-5, the publication is Journal of Agricultural and Food Chemistry (1954), 996-9, database is CAplus.

cf. C.A. 46, 5773g; 47, 6593a. The formative activities of approx. 145 ring-substituted phenoxyacetic acids have been measured by the bean-leaf repression technique. The presence of a halogen atom at position 4 appears to be a requisite for high activity. The order of effectiveness of the halogens is Cl > F > Br > I. Further enhancement of activity may ensue through introduction of an addnl. halogen or Me substituent at position 2.

Journal of Agricultural and Food Chemistry 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 C9H10O4, Application In Synthesis of 1798-04-5.

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

Weintraub, Robert L. published the artcileRelation between molecular structure and physiological activity of plant-growth regulators. II. Formative activity of phenoxyacetic acids, SDS of cas: 163839-73-4, the publication is Journal of Agricultural and Food Chemistry (1954), 996-9, database is CAplus.

cf. C.A. 46, 5773g; 47, 6593a. The formative activities of approx. 145 ring-substituted phenoxyacetic acids have been measured by the bean-leaf repression technique. The presence of a halogen atom at position 4 appears to be a requisite for high activity. The order of effectiveness of the halogens is Cl > F > Br > I. Further enhancement of activity may ensue through introduction of an addnl. halogen or Me substituent at position 2.

Journal of Agricultural and Food Chemistry published new progress about 163839-73-4. 163839-73-4 belongs to catalysis-chemistry, auxiliary class Trifluoromethyl,Fluoride,Carboxylic acid,Benzene,Ether, name is 2-(4-(Trifluoromethyl)phenoxy)acetic acid, and the molecular formula is C13H10O2, SDS of cas: 163839-73-4.

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

Daugulis, Olafs published the artcilePhosphinidine-Palladium Complexes for the Polymerization and Oligomerization of Ethylene, Application of 2,4,6-Triisopropylbenzenethiol, the publication is Organometallics (2002), 21(26), 5935-5943, database is CAplus.

Several cationic palladium complexes containing bulky phosphinidine-imine, phosphinidine-sulfide, and imine-sulfide ligands have been prepared These complexes catalyze the oligomerization and polymerization of ethylene with moderate to high rates (for palladium catalysts) and display higher stability compared to diimine-palladium systems. Thus, reaction of (cod)PdMeCl with [(2,6-(i-Pr)₂C₆H₃)N:C(Ph)C(Me):PMes^*] (Mes^* = 2,4,6-tri-tert-butylphenyl, preparation given) gave palladium complex which on treatment with NaB(Ar_F)₄ (Ar_F = 3,5-C₆H₃(CF₃)₂) in MeCN gave phosphinidine-imine palladium complex, [((2,6-(i-Pr)₂C₆H₃)N:C(Ph)C(Me):PMes^*)Pd(NCMe)Me]⁺B(Ar_F)₄^– (crystal structure), as ethylene polymerization catalyst.

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, Application of 2,4,6-Triisopropylbenzenethiol.

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

Abdelbaky, Tarek M. published the artcileImprovement of erectile function in diabetic rats by insulin: possible role of the insulin-like growth factor system, HPLC of Formula: 38260-01-4, the publication is Endocrinology (1998), 139(7), 3143-3147, database is CAplus and MEDLINE.

Erectile dysfunction is commonly experienced in men with diabetes mellitus. The authors report that the intracavernous pressure (ICP) rise in diabetic rats was 55% of the control and returned to normal following insulin (I) or insulin plus free oxygen scavenger (I + S) treatment. Insulin-like growth factor (IGF) binding protein (IGFBP) -3, -4, and -5 mRNA levels in the major pelvic ganglia (MPG) of diabetic rats were elevated by 2-fold, 2.6-fold, and 2.5-fold, resp. Both I and I + S returned IGFBP-4 and 5 mRNA levels to normal, whereas IGFBP-3 gene expression was severely inhibited. IGFBP-2 gene expression was greatly inhibited by diabetes and was unresponsive to treatment. In the penis of diabetic rats, IGFBP-2 and -4 mRNA levels were low, whereas IGFBP-3 mRNA levels were elevated 10-fold. These effects were reversed by I and I + S. I and I + S also corrected the IGFBP-3 expression pattern. IGF-I gene expression in the penis and MPG was not significantly increased by diabetes and returned to normal levels following I or I + S treatment. Because IGFs are potent regulatory factors in vascular tone, this newly described activity of insulin may play an important role in the improvement of erectile function seen clin. and in animal models.

Endocrinology published new progress about 38260-01-4. 38260-01-4 belongs to catalysis-chemistry, auxiliary class Chelating Agents, name is N1,N1′-(Ethane-1,2-diyl)bis(ethane-1,2-diamine) dihydrochloride, and the molecular formula is C6H20Cl2N4, HPLC of Formula: 38260-01-4.

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

Block, Eric published the artcileMercury(II) and methylmercury(II) complexes of novel sterically hindered thiolates: carbon-13 and mercury-199 NMR studies and the crystal and molecular structures of [MeHg(SC₆H₂-2,4,6-Pr-iso₃)], [Hg(SC₆H₄-2-SiMe₃)₂], [Hg(2-SC₅H₃N-3-SiMe₃)₂], and [Hg{(2-SC₆H₄)₂SiMe₂}]₂, Application of 2,4,6-Triisopropylbenzenethiol, the publication is Inorganic Chemistry (1990), 29(17), 3172-81, database is CAplus.

Several series of complexes of the types [MeHg(SR)] and [Hg(SR)₂] were synthesized, where the ligands are members of new classes of sterically hindered thiolates, including (triorganosilyl)methanethiols, 2-(triorganosilyl)benzenethiols, 3-(triorganosilyl)pyridine-2-thiols, and bis(2-mercaptophenyl) derivatives Detailed ¹H, ¹³C, and ¹⁹⁹Hg NMR studies revealed several general trends. The ¹⁹⁹Hg chem. shifts moved upfield in the order [MeHg(SR)] < [Hg(SCR’R”R”’)₂] < [Hg(S-aryl)₂] < [Hg(S-pyridyl)₂]. For the [MeHg(SR)] series of complexes, ¹J(Hg-C) correlates with ¦Ä(¹³C(methyl)) and with the type of thiolate ligand. Anomalous behavior is observed for oligomeric species. There is only a limited correlation of ¦Ä(¹⁹⁹Hg) with steric cone angles for a subset of the complexes. The structures of 4 of these complexes, I–IV, were determined by x-ray crystallog.

Inorganic Chemistry 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 of 2,4,6-Triisopropylbenzenethiol.

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

Brisson, Josee published the artcileNew refinement of the crystal structure of 1,3-diaminopropane dihydrochloride, Computed Properties of 10517-44-9, the publication is Journal of Crystallographic and Spectroscopic Research (1982), 12(1), 39-43, database is CAplus.

The title compound is orthorhombic, space group Pbcn, with a 8.567(3), b 9.341(2), and c 9.444(9) ?; d.(exptl.) = 1.30 and d.(calculated) = 1.29 for Z = 4. The structure, which had previously been solved and refined to R = 0.196 by S. Hirokawa et al. (1968), was refined to R = 0.034. At. parameters, bond angles and distances are given.

Journal of Crystallographic and Spectroscopic Research published new progress about 10517-44-9. 10517-44-9 belongs to catalysis-chemistry, auxiliary class Salt,Amine,Aliphatic hydrocarbon chain, name is Propane-1,3-diamine dihydrochloride, and the molecular formula is C3H12Cl2N2, Computed Properties of 10517-44-9.

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