Catalysis-chemistry

Roque, Ana Carolina Abbud Hanna published the artcileConformational analysis for infrared spectroscopy and theoretical calculations of some 2-bromo-2-propyl 2-aryl-acetates, ibuprofen and naproxen analogs, Safety of 4-Nitrophenylacetic acid, the publication is Journal of Molecular Structure (2021), 130027, database is CAplus.

Conformational anal. of new para-substituted 2-bromo-2-Pr 2-aryl-acetates (Y = H, OMe, Cl, and NO₂) (R1), ibuprofen (R2), and naproxen (R3) analogs using IR (IR) spectroscopy and theor. calculations was performed to determine the preferential conformers of these compounds in solvents with increasing polarity (CCl₄, CH₃Cl, and CH₃CN). The aryl-bromo-esters were synthesized via the esterification of 2-bromo-2-methylpropan-1-ol and the corresponding carboxylic acids, with good yields (?36-70%). The IR spectra showed that these compounds presented only one conformation, and the exptl. data were supported by the theor. results obtained by d. functional theory (DFT) calculations using the 6311+G (2df, 2p) basis set. The calculations revealed that all the studied compounds presented two stable geometric conformations, which agrees with the data obtained exptl. in CCl₄. Theses conformers are stabilized by intramol. hydrogen bonds. However, the orbital interaction calculations using the natural bond orbital (NBO) method showed that the ¦Ç_O¡ú¦Ò*_C-C,¦Ç_O¡ú¦Ò*_C-O, ¦Ç_O¡ú¦Ò*_C-O and ¦Ç_O¡ú¦Ð*_C-O hyper-conjugations are the main interactions that stabilize the conformations. The compounds preferentially adopt the anti-conformation because the steric effect between the gauche bromo and oxygen atoms overrides the hyper-conjugative interactions, in addition to the stabilizing ¦Ò_C-H¡ú ¦Ò*_C-Br interactions in the conformers.

Journal of Molecular Structure published new progress about 104-03-0. 104-03-0 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Carboxylic acid,Benzene, name is 4-Nitrophenylacetic acid, and the molecular formula is C8H7NO4, Safety of 4-Nitrophenylacetic acid.

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

Amoo, Victor Ekow published the artcileSynthesis of (S)-manoalide diol and the absolute configuration of natural manoalide, Formula: C15H15OP, the publication is Tetrahedron Letters (1988), 29(20), 2401-4, database is CAplus.

A synthesis of (S)-manoalide diol (I) was achieved using 2-deoxy-D-ribose as starting material to unequivocally supply the stereochem. Reduction of natural manoalide afforded enantiomeric manoalide diol. Thus, the absolute configuration of manoalide (II) is R. I had lower inhibitory activity than II vs. phospholipase A₂.

Tetrahedron Letters published new progress about 4141-48-4. 4141-48-4 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Allyldiphenylphosphine oxide, and the molecular formula is C15H15OP, Formula: C15H15OP.

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

Lombardi, Christopher published the artcileSelective Cross-Coupling of (Hetero)aryl Halides with Ammonia To Produce Primary Arylamines using Pd-NHC Complexes, Category: catalysis-chemistry, the publication is Organometallics (2017), 36(2), 251-254, database is CAplus.

Herein we report the first example of (hetero)arylation of ammonia using a monoligated palladium-NHC complex. The new, rationally designed, precatalyst (DiMeIHept^Cl)Pd(allyl)Cl featuring highly branched alkyl chains has been shown to be effective in selective aminations across a range of challenging substrates, including nitrogen-containing heterocycles and those featuring base-sensitive functionality. The less bulky Pd-PEPPSI-IPent^Cl precatalyst performs well for ortho-substituted aryl halides, giving monoarylated products in high yield with good selectivity.

Organometallics published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, Category: catalysis-chemistry.

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

Chen, C. Y. published the artcileGiant Raman scattering and luminescence by molecules adsorbed on silver and gold metal island films, SDS of cas: 10510-54-0, the publication is Surface Science (1980), 101(1-3), 363-6, database is CAplus.

In order to elucidate the role played by the submicroscopic surface roughness in the enhancement of Raman scattering (RS) by mols. adsorbed on a Ag electrode, the RS was studied for mols. such as isonicotinic acid and benzoic acid adsorbed on ?50-? island films of Ag and Au. When a Ag island film is used as an overlayer on mols. that are chemisorbed on an oxide substrate, such as glass, a strongly enhanced RS is observed for isonicotinic acid, which is comparable in intensity and also similar in character to that observed for pyridine adsorbed on an electrochem. processed Ag electrode. However, no RS is observed when the Ag island film is used as the overlayer on PhCO₂H. When a Ag island film is used as a substrate for the adsorption of the mols. from solution (via chemisorption of the carboxylate group to the oxide or sulfide layer that forms when the Ag island film is exposed to air) a strong RS is observed for PhCO₂H acid as well as for isonicotinic acid. Chemisorption may play an important role in the enhancement process.

Surface Science published new progress about 10510-54-0. 10510-54-0 belongs to catalysis-chemistry, auxiliary class Other Aromatic Heterocyclic,Salt,Amine,Inhibitor,Inhibitor, name is 5,9-Diaminobenzo[a]phenoxazin-7-ium acetate, and the molecular formula is C18H15N3O3, SDS of cas: 10510-54-0.

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

Nie, Shao-Zhen published the artcileEnantioselective Coupling of Dienes and Phosphine Oxides, Recommanded Product: Dimesitylphosphine oxide, the publication is Journal of the American Chemical Society (2018), 140(48), 16450-16454, database is CAplus and MEDLINE.

The authors report a Pd-catalyzed intermol. hydrophosphinylation of 1,3-dienes to afford chiral allylic phosphine oxides. Commodity dienes and air stable phosphine oxides couple to generate organophosphorus building blocks with high enantio- and regiocontrol. This method constitutes the 1st asym. hydrophosphinylation of dienes.

Journal of the American Chemical Society published new progress about 23897-16-7. 23897-16-7 belongs to catalysis-chemistry, auxiliary class Aryl phosphine ligand,Mono-phosphine Ligands, name is Dimesitylphosphine oxide, and the molecular formula is C18H23OP, Recommanded Product: Dimesitylphosphine oxide.

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

Adkins, Homer published the artcileCatalytic dehydrogenation of hydroaromatic compounds in benzene. II, Application In Synthesis of 1949-41-3, the publication is Journal of the American Chemical Society (1949), 2955-7, database is CAplus.

cf. C. A. 35, 4371.3. The method of aromatizing hydroaromatic compounds over Ni or Pt catalysts with C₆H₆ as a H acceptor was applied to several substituted hydronaphthalenes and hydrophenanthrenes. Aromatization in some cases involved the rupture of linkages to a quaternary C. The Ni-on-kieselguhr catalyst aromatized through catalysis of migration, as in the formation of phenanthrene (I) from 1′,2′,3′,4′-tetrahydrospiro(cyclopentane-1,1′-naphthalene) (II). The Pt and Ni-on-Ni chromite catalysts aromatized through elimination of an alkyl group on the quaternary C. Decahydro-2-naphthol (III), b₂₈ 140-3¡ã, n²⁵_D 1.4958-1.5000, was prepared by hydrogenation of 2-naphthol (IV) over Raney Ni at 200¡ã. III (40 g.) was oxidized to octahydro-2(1H)-naphthalenone (V) (24 g.), b₂₇ 123.5-25¡ã, n²⁵_D 1.4885-905. 2-Methyldecahydronaphthalene (VI), b. 203-5¡ã, n²⁵_D 1.4712, and the 2-Et homolog (VII), b₇ 85-7¡ã n²⁵_D 1.4727, were prepared by hydrogenation at 200¡ã over Raney Ni, from 2-C₁₀H₇Me (VIII) and 2-C₁₀H₇COMe, resp. 1,1-Dimethyl-1,2,3,4-tetrahydronaphthalene (IX), b₁₂ 94-5¡ã, n²⁵_D 1.5262; 4a-methyl-1,2,3,4,4a,-9,10,10a-octahydrophenanthrene (X), b₁₃ 150¡ã, n²⁵_D 1.5510; and 4a-isopropyl-2-methyl-1,2,3,4,4a,9,10,10a-octahydrophenanthrene (XI), n²⁵_D 1.5435, were prepared as previously described (Bogert, et al., C.A. 28, 3071.2; Perlman, et al., C.A. 31, 1395.7; Orcutt and Bogert, C.A. 34,752.9). Ph(CH₂)₃Br (XII) (160 g.) in 300 cc. dry ether was added to 20 g. Mg during 50 min., the mixture refluxed 50 min., 72 cc. MeCOEt in 72 cc. dry ether added during 20 min., the mixture refluxed 30 min., the product hydrolyzed with saturated NH₄Cl, and the ether solution washed twice, dried, and distilled, yielding the alc. (XIII) (125 g.), b₂₃ 154-63¡ã, n²⁵_D 1.4970-1.5050. To 85 g. XIII at 15¡ã was added 85 cc. cold, concentrated H₂SO₄ dropwise with stirring (the temperature kept below 25¡ã), the mixture diluted after 10 min. with water and ether, and the ether solution washed with Na₂CO₃, dried, and distilled from Na, yielding (after redistillation through a modified Widmer column) 34 g. 1-methyl-1-ethyl-1,2,3,4-tetrahydronaphthalene (XIV), b₂₃ 127-7.5¡ã, n²⁵_D 1.5255. XII (125 g.) in 225 cc. dry ether and 72 cc. MeCOPh in 70 cc. ether (added during 20 min.) were refluxed 1 hr., the product hydrolyzed with dilute H₂SO₄, the ether solution washed with water, the ether distilled, and the crude alc. cyclized as described above, yielding (after redistillation over Na) 67 g. 1-methyl-1-phenyl analog (XIVA) of XIV, b₁ 129-31¡ã, n²⁵_D 1.5853, M_D calculated 71.32, found 71.6. Cyclopentanone (71 cc.) in 70 cc. dry ether added to 160 g. XII in ether during 30 min., the mixture refluxed 1 hr., the product hydrolyzed with saturated NH₄Cl, and the ether solution washed with water, dried, and distilled, yielded an alc. b₂₅ 150-70¡ã, n²⁵_D 1.5200, which, cyclized by treatment with an equal volume of cold, concentrated H₂SO₄, yielded (after distillation from Na) 23.1 g. II, b₂₄ 158¡ã, n²⁵_D 1.5535. Powd. K (19.5 g.) in 500 cc. xylene was cooled, 87 g. MeCH(CO₂Me)₂ (XV) added during 10 min., and, after 1 hr., 93 g. PhCH₂CH₂Br (XVA) added, the mixture stirred and refluxed 12 hrs. in an oil bath at 150-60¡ã, and the xylene solution washed with water, dried, and distilled, yielding 85 g. di-Et methylphenethylmalonate, b₁₇ 188-92¡ã, n²⁵_D 1.4818-20, 93 g. of which was hydrolyzed by refluxing it 90 min. with 56 g. KOH in 200 cc. 50% aqueous alc., water added, the alc. distilled off, the solution acidified with concentrated HCl, the precipitated acid dissolved in ether, the aqueous solution extracted with ether, the extracts combined, washed, and dried, and the ether distilled; the acid, heated to 180¡ã and distilled after the evolution of CO₂, yielded 48.9 g. ¦Ã-phenyl-¦Á-methylbutyric acid (XVI), b₁₇ 176-8¡ã, n²⁵_D 1.5093-1.5100. PCl₅ (80 g.) was added to 53.8 g. XVI in 250 cc. dry C₆H₆, the solution refluxed 30 min., cooled, 70 cc. SnCl₄ in 70 cc. C₆H₆ added slowly, the mixture poured after 25 min. into 250 cc. concentrated HCl, and the C₆H₆ solution separated, washed with three 100-cc. portions of 10% HCl and three 100-cc. portions of 5% Na₂CO₃, dried, and distilled, yielding 34.2 g. 3,4-dihydro-2-methyl-1(2H)-naphthalenone (XVII), b₁₆ 136-8¡ã, n²⁵_D 1.5538. 2-Et homolog (XVIII) was similarly prepared from 20 g. K, 94 g. Et₂C(CO₂Et)₂, and 93 g. XVA, which yielded 70 g. di-Et ethylphenethylmalonate (XIX), b₄ 160-80¡ã. The yield was much lower when C₆H₆ was used instead of xylene. XIX (102.8 g.) on hydrolysis and decarboxylation yielded 62.5 g. of the ¦Á-Et homolog (XX) of XVI, b₃ 146-61¡ã, n²⁵_D 1.5010-1.5055. XX (10.3 g.) heated to 90¡ã for 2.5 hrs. in 30 cc. concentrated H₂SO₄ on the steam bath, cooled, diluted with water, extracted with ether, the ether solution washed with Na₂CO₃, and the ether removed, yielded 7.8 g. XVIII, b₁₅ 147-8¡ã, n²⁵_D 1.5460-1.5458. XVII (20 g.) in 50 cc. dry ether was added during 20 min. to 17.5 g. EtBr and 3.9 g. Mg in 70 cc. dry ether, the mixture refluxed 6 hrs., the product hydrolyzed with ice-cold dilute H₂SO₄, the ether solution washed with dilute H₂SO₄, then Na₂CO₃, and dried, and the ether removed, yielding 16.1 g. 1-ethyl-2-methyl-1,2,3,4-tetrahydro-1-naphthol (XXII), m. 65-7¡ã (from Me₂CO at -70¡ã). 1-Ethyl-2-methyl-3,4-dihydronaphthalene (XXIII), prepared in 4.47-g. yield by dehydrating the filtrates from the recrystallization of XXII, removing the Me₂CO, and distilling the residue from KHSO₄, b₁₃ 121-7¡ã, n²⁵_D 1.5660. XVIII (21.8 g.) in 50 cc. dry ether added to 23 g. MeI and 3.9 g. Mg in 70 cc. ether, the mixture refluxed 30 min., the product decomposed with saturated NH₄Cl, the ether solution washed with water and dried, and the ether removed, yielded 16.6 g. 1-methyl-2-ethyl isomer (XXIV) of XXIII, b₁₄ 132¡ã (from Na), n²⁵_D 1.5658. The m.p. (148¡ã) of the trinitrobenzene derivative (XXV) of 1,2-C₁₀H₆Me₂ (XXVI) is the same as that of a mixture of 30% XXV and 70% of the trinitrobenzene derivative (XXVII), m. 154¡ã, of 1-C₁₀H₇Me (XXVIII); mixtures containing 80 and 90% XXVII m. 149.5¡ã and 151¡ã, resp. The m.p. (or b.p.) of some of the above compounds and of 1-ethyl- (XXIX), 2-ethyl- (XXX), 1-methyl-2-ethyl-(XXXI), and 2-methyl-1-ethylnaphthalenes (XXXII), 2-methylphenanthrene (XXXIII), as also the m.p. of their (a) picrate, (b) C₆H₃(NO₂)₃ derivative, and (c) styphnate, are listed below. XXVIII -22¡ã, n²⁰_D 1.6180, (a) 141-2¡ã, (b) 153-4¡ã; VIII 37-8¡ã, n²⁵_D 1.6086, (a) 115-16¡ã, (b) 123¡ã; XXVI b₁₅ 139-40¡ã, n^16.6_D 1.6105, (a) 129.5-30.5¡ã, (b) 147-8¡ã, (c) 142-3¡ã; XXIX -15¡ã, n¹⁵_D 1.6089, (a) 98.5¡ã; XXX -7.5¡ã, n¹⁵_D 1.6028, (a) 76-7¡ã, (b) 88-9¡ã; XXXI b₁₁ 140-5¡ã, (a) 97¡ã, (b) 98.5-9.5¡ã, (c) 114¡ã; XXXII b₁₁ 135-45¡ã, (a) 110-11¡ã, (b) 117.5-19.5¡ã, (c) 141¡ã; XXXIII 55-6¡ã, (a) 118-19¡ã. The dehydrogenations were made on about 5 g. of compound in 20-40 cc. C₆H₆ for 10-12 hrs., in chrome-vanadium steel vessels having voids of 62 cc. (Pt catalysts) or 270 cc. (Ni catalysts). Below are the results (compound, g. catalyst, temperature, and product, resp.): IX, 0.5 Pt, 350¡ã, 25% XXVIII (61% no reaction); 3 Ni (CrO), 370¡ã, 38% XXVIII (50% no reaction); 3 Ni (k), 350¡ã, 35% XXVI (35% no reaction). XIV, 3Ni (CrO), 375¡ã, 35-55% XXVIII (27% no reaction). XIVA, 3 Ni (k), 350¡ã, 12% XXVIII. II, 3 Ni (k), 350¡ã, 25-40% I. X, 1 Pt, 350¡ã, 65% I. XI, 2 Ni (CrO), 350¡ã, 50% XXXIII. VI, 1 Pt, 350¡ã, 91% VIII. VII, 0.25 Pt, 350¡ã, 94% XXX. XXII, 2 Ni (k), 300¡ã, 66% XXXII. XXIV, 0.25 Pt, 300¡ã, 91% XXXI. III, 1 Pt, 275¡ã, 18% IV. V, 1 Pt, 275¡ã, 20% IV and 33% C₁₀H₈.

Journal of the American Chemical Society 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 In Synthesis of 1949-41-3.

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

Setti, Eduardo L. published the artcile3,4-Disubstituted azetidinones as selective inhibitors of the cysteine protease cathepsin K. Exploring P3 elements for potency and selectivity, Application In Synthesis of 6972-05-0, the publication is Bioorganic & Medicinal Chemistry Letters (2005), 15(5), 1529-1534, database is CAplus and MEDLINE.

The synthesis of a series of highly potent and selective inhibitors of cathepsin K based on the 3,4-disubstituted azetidin-2-one warhead is reported. A high degree of potency and selectivity was achieved by introducing a basic nitrogen into the distal part of the P3 element of the mol. Data from kinetic and mass spectrometry experiments are consistent with the interpretation that compounds of this series transiently acylate the sulfhydrile of cathepsin K.

Bioorganic & Medicinal Chemistry Letters published new progress about 6972-05-0. 6972-05-0 belongs to catalysis-chemistry, auxiliary class Thiourea,Amine,Aliphatic hydrocarbon chain,Amide, name is 1,1-Dimethylthiourea, and the molecular formula is C14H26O2, Application In Synthesis of 6972-05-0.

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

Bennett, Jeffrey A. published the artcileContinuous Ligand-Free Suzuki-Miyaura Cross-Coupling Reactions in a Cartridge Flow Reactor Using a Gel-Supported Catalyst, Safety of 4,4′-Dimethyldiphenyl, the publication is Industrial & Engineering Chemistry Research (2021), 60(26), 9418-9428, database is CAplus.

The Suzuki-Miyaura cross-coupling reaction is one of the most important reactions for pharmaceutical and fine chem. synthesis, performed using both homogeneous and heterogeneous catalysis. In this work, we crosslink poly(methylhydrosiloxane) (PMHS) with tri(ethylene glycol divinyl ether) to create a versatile and readily accessible gel catalyst support for Suzuki-Miyaura cross-coupling reactions in a pseudoheterogeneous manner. The Si-H units present on the PMHS backbone act dually as the crosslinking site and the reducing agent to anchor and reduce palladium(II) acetate to active palladium(0). The PMHS-supported Pd catalyst is then packed into a stainless-steel flow reactor to create a cartridgelike reactor for the continuous operation of a model Suzuki-Miyaura cross-coupling reaction. We systematically investigate the role of reaction temperature, catalyst loading, crosslinking d., and gel particle size on the transient and steady-state behavior of the cartridge flow reactor through an automated flow chem. platform. The PMHS-supported catalytic particles demonstrate minimal deactivation and leaching over a continuous (80 h) Suzuki-Miyaura cross-coupling reaction at a 30 min nominal residence time at a relatively high reaction temperature of 95¡ãC. The developed modular flow chem. strategy equipped with the cartridge flow reactor enables accelerated studies of the fundamental and applied characteristics of gel-supported catalysts while providing increased safety, higher throughput, and removal of the separation step needed for catalyst recovery compared to homogeneous cross-coupling reactions in batch reactors.

Industrial & Engineering Chemistry Research published new progress about 613-33-2. 613-33-2 belongs to catalysis-chemistry, auxiliary class Benzene, name is 4,4′-Dimethyldiphenyl, and the molecular formula is C14H14, Safety of 4,4′-Dimethyldiphenyl.

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

Debnath, Mintu published the artcile¦Á,¦Å-Hybrid Peptide Foldamers: Self-Assembly of Peptide with Trans Carbon-Carbon Double Bonds in the Backbone and Its Saturated Analogue, HPLC of Formula: 1772-76-5, the publication is ACS Omega (2018), 3(8), 8760-8768, database is CAplus and MEDLINE.

The effect of geometrically rigid trans ¦Á,¦Â-unsaturated ¦Å-amino acids on the structure, folding and assembly of ¦Á,¦Å-hybrid peptide foldamers has reported. From single crystal diffraction anal., the unsaturated tetrapeptide 1 has stapler pin like structure, but without intramol. hydrogen bond. The asym. unit has two mols. which are stabilized by multiple intermol. hydrogen bonding interactions as well as ¦Ð-¦Ð stacking interactions between the aromatic rings of 3-aminocinnamic acid. Peptide 1 does not form organogel. But on hydrogenation, peptide 1 provides the saturated ¦Á,¦Å-hybrid peptide foldamer 2 which forms instant gel in most of the aromatic solvents. The gel exhibits high stability. The unsaturated peptide 1 has porous microspheres morphol. but saturated analog 2 has ribbons like morphol. The gel has been used efficiently for removal of cationic organic pollutants from waste water.

ACS Omega 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

Kundu, Sandip Kumar published the artcile6-(¦Á-Hydroxy-¦Á-aryl/naphthyl)methyl-3,4-dihydro-2,5-benzodiazocin-1(2H)-ones and diphenylmethanes from C-2 arylated 1,3-indandiones, HPLC of Formula: 457-68-1, the publication is Journal of Chemical Research (2004), 781-783, database is CAplus.

Stirring 2-hydroxy-2-aryl-1,3-indandiones in ethylenediamine at room temperature for 1-2 h produces benzodiazocinones I (R¹R² = benzo, R³ = R⁴ = H; R¹ = R² = H, R³R⁴ = benzo; R¹, R² = H, Me; R³ = H, Me, MeO, Cl; R⁴ = H) in 80-90% yields. Under similar reaction conditions 2,2-diaryl-1,3-indandiones furnish diphenylmethanes.

Journal of Chemical Research published new progress about 457-68-1. 457-68-1 belongs to catalysis-chemistry, auxiliary class Fluoride,Benzene, name is Bis(4-fluorophenyl)methane, and the molecular formula is C13H10F2, HPLC of Formula: 457-68-1.

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