Tag: M.W=200-250

Shavaleev, Nail M. published the artcileNear-Infrared Luminescence of Nine-Coordinate Neodymium Complexes with Benzimidazole-Substituted 8-Hydroxyquinolines, Synthetic Route of 457-68-1, the publication is Inorganic Chemistry (2008), 47(19), 9055-9068, database is CAplus and MEDLINE.

A new class of benzimidazole-substituted 8-hydroxyquinoline ligands was prepared that contain a monoanionic tridentate N,N,O-coordinating unit. These ligands, e.g., benzimidazolyl(hydroxy)quinoline I (HL) and methylenebis(hydroxyquinolinylbenzimidazole) II (L2) form charge-neutral lanthanide complexes [Ln(L-R)₃]¡¤nH₂O or [Ln₂(L2)₃]¡¤nH₂O (n = 1-3) with early lanthanides from La^III to Gd^III inclusive. Crystallog. characterization was carried out for 11 complexes with 6 different ligands. In all of these structures, the lanthanide ion is nine-coordinated by three ligands arranged in an up-up-down fashion around the metal center. The coordination environment can be described as a tricapped trigonal prism, with N atoms of quinoline rings occupying capping positions. Upon deprotonation of the ligand and complex formation, a new absorption band appears in the visible range of the spectrum with a maximum at 466-483 nm and molar absorptivity of (7.2-18) ¡Á 10³ M^-1 cm^-1. Its origin probably is an intraligand phenolate-to-pyridyl charge transfer transition centered on the 8-hydroxyquinolate chromophore. Upon excitation in ligand absorption bands, new Nd^III complexes display characteristic metal-centered luminescence in the near-IR region from 850 to 1450 nm with quantum yields and lifetimes in solid state at room temperature ¡Ü0.34% and 1.2 ¦Ìs, resp.

Inorganic Chemistry 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 C7H5ClN2S, Synthetic Route of 457-68-1.

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

Liu, Rong Qiang published the artcile2-Alkenyldiphenylphosphine oxides and PO-ylides derived thereof in trans selective Horner-Wittig olefination reactions, COA of Formula: C15H15OP, the publication is Synlett (1996), 1195-1196, database is CAplus.

Allylic PO-ylides generated by deprotonation of 2-alkenyldiphenylphosphine oxides with BuLi were used to prepare 1,3-dienes trans-selectively. The (Z/E) ratios of the newly formed double bond are 1:99 when straight-chain, while they were 2:98 to 4:96 when ¦Â-branched aliphatic, and 4:96 to 6:94 when aromatic aldehydes were employed.

Synlett 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, COA of Formula: C15H15OP.

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

Tacke, Reinhold published the artcileSyntheses and Pharmacological Properties of the Histaminic H₁ Antagonists Sila-terfenadine-A, Sila-terfenadine-B, Disila-terfenadine, and Sila-fexofenadine: A Study on C/Si Bioisosterism, Formula: C12H10F2Si, the publication is Organometallics (2004), 23(21), 4915-4923, database is CAplus.

Sila-substitution (C/Si exchange) of one or both of the two quaternary carbon atoms of the histaminic H₁ antagonist terfenadine (1a) leads to sila-terfenadine-A (1b; R₃COH ¡ú R₃SiOH), sila-terfenadine-B (1c; R₄C ¡ú R₄Si), or disila-terfenadine (1d; R₃COH ¡ú R₃SiOH, R₄C ¡ú R₄Si). Sila-substitution of the quaternary carbon atom of the histaminic H₁ antagonist fexofenadine (2a) affords sila-fexofenadine (2b; R₃COH ¡ú R₃SiOH). The silicon compounds were synthesized in multistep syntheses, and the identities of these compounds and their precursors were established by elemental analyses and multinuclear NMR studies. Some of the precursors were addnl. characterized by single-crystal x-ray diffraction. The pharmacol. profiles of silicon compounds were assessed across a range of histaminic receptor binding assays (radioligand binding studies at histamine central H₁, peripheral H₁, H₂, and H₃ receptors). The silicon compounds, within exptl. error, exhibited an affinity and selectivity profile similar to their corresponding carbon analogs.

Organometallics 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 C3H6F3N, Formula: C12H10F2Si.

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

Menz, J. published the artcileUsage pattern-based exposure screening as a simple tool for the regional priority-setting in environmental risk assessment of veterinary antibiotics: A case study of north-western Germany, Application In Synthesis of 140-28-3, the publication is Chemosphere (2015), 42-48, database is CAplus and MEDLINE.

Veterinary antibiotics (VAs) are widely recognized as important environmental contaminants. Despite the extensive use of antibiotic agents in meat and poultry production and the known resistance problems in human and veterinary medicine, detailed knowledge about usage patterns of VAs in Germany is still scarce. This lack of knowledge severely impacts current research on the environmental risk of VAs, but it is expected that recently established surveillance programs for antimicrobial drug usage will close this knowledge gap. Therefore, a spatially more precise environmental risk assessment and management might become possible in the near future. In this study, a new usage pattern-based exposure screening (UPES) approach for the comprehensive environmental exposure assessment of veterinary antibiotics was preliminarily assessed using approximated scenarios of antimicrobial substance usage in German meat and poultry production Resulting predicted manure concentrations covered seven orders of magnitude ranging from ng kg^-1 to g kg^-1 dry weight (dw). Beyond that 14 antibiotic substances of 10 different antimicrobial classes were predicted to have the potential to occur in soil concentrations higher than 100 ¦Ìg kg^-1 dw. These findings raise further questions regarding the environmental exposure and risks of frequently used VAs, especially in regions with higher-than-average livestock d. With this case study we demonstrate that UPES simplifies to account for differing local agricultural factors and therefore facilitates priority-setting on a regional level. In this context a simple prioritization scheme for environmental assessment of VAs, considering both the expected environmental concentration and the frequency of application, is proposed in this paper.

Chemosphere 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

Schulz, Stephan published the artcileSynthesis and structure of organometallic compounds with (Al₂Si)₂ and Al₃Sb₂ frameworks, Related Products of catalysis-chemistry, the publication is Angewandte Chemie, International Edition in English (1995), 34(8), 919-20, database is CAplus.

[(C₅Me₅AlF)₂SiPh₂]₂ (I) was prepared by treating (C₅Me₅Al)₄ with Ph₂SiF₂. Treating (Me₃CSb)₄ with (C₅Me₅Al)₄ gave (C₅Me₅Al)₃Sb₂. The crystal structure of I was determined

Angewandte Chemie, International Edition in English 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 C23H20BN, Related Products of catalysis-chemistry.

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

Kriegsmann, Heinrich published the artcileSpectroscopic investigations on silicone compounds. IV. Vibrational spectra of phenylsilanes, phenylhalosilanes, and phenylhalosiloxanes, Quality Control of 312-40-3, the publication is Zeitschrift fuer Physikalische Chemie (Leipzig) (1958), 261-97, database is CAplus.

cf. C.A. 53, 2787a. Raman and infrared spectra of mols. of the type PhSiX₃, Ph₂SiX₂, and Ph₃SiX (X = H, F, Cl), and of Ph₂Si(OH)₂, Ph₃SiOH, (Ph₃Si)₂O, (Ph₂SiO)₃, and (Ph₂SiO)₄ were measured and are given in graphs and tabular summaries. In the assignment of the bands, the internal oscillations of the Ph groups are easily separable from the oscillations of the rest of the mol. structure, and the valency frequencies Si-X can be assigned without difficulty. The partially occurring increase of these frequencies to values above those for the respective bands in the respective Me and H derivatives is discussed theoretically. The apparatus and methods used were the same as described in the previous publications.

Zeitschrift fuer Physikalische Chemie (Leipzig) 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, Quality Control of 312-40-3.

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

Babchin, Alexander J. published the artcileOsmotic repulsion force due to adsorbed surfactants, Name: Dodecylamineacetate, the publication is Colloids and Surfaces, B: Biointerfaces (2012), 137-143, database is CAplus and MEDLINE.

When considering interaction forces in surfactant-stabilized colloidal dispersions a factor that has been rarely discussed is the possible effect of osmotic force due to overlapping adsorbed surfactant monolayers. In the present work, the osmotic repulsion force is built-in on the basis of DLVO mechanics and based on Fischer’s consideration of the analogous situation for adsorbed polymer layers on solid surfaces and on Langmuir’s earlier concept of osmotic pressure excess due to overlapping adsorption layers. The advanced method for calculation of the net repulsion force in overlapping surfactant monolayers is developed and applied to real adsorbed surfactant systems. We show that the value of disjoining pressure can reach values as high as 8 MPa for the condition of fully overlapping surfactant adsorption layers, based on the calculation of the first virial term of the general expression for osmotic pressure. Thus, we have shown that osmotic forces can be substantial at distances of close interfacial approach, and that they can easily be of the same or greater order of magnitude than the forces that have been more conventionally considered.

Colloids and Surfaces, B: Biointerfaces 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, Name: Dodecylamineacetate.

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

Hengge, E. published the artcilePreparation and characterization of the phenylfluordisilanes Si₂Ph_6-nF_n, Application In Synthesis of 312-40-3, the publication is Journal of Organometallic Chemistry (1986), 299(1), 1-8, database is CAplus.

Ag powder catalyzed the fluorination of Si₂Ph_6-nCl_n by ZnF₂ to give Si₂Ph_6-nF_n. Also, photolysis of (SiPh₂F)₂Hg gave FPh₂SiSiPh₂F.

Journal of Organometallic Chemistry 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 In Synthesis of 312-40-3.

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

Truong, Ngoc published the artcileDirect carbon-carbon bond formation via reductive soft enolization: a syn-selective Mannich addition of ¦Á-iodo thioesters, Category: catalysis-chemistry, the publication is Organic & Biomolecular Chemistry (2016), 14(33), 7864-7868, database is CAplus and MEDLINE.

The ¦Â-amino carboxylic acid moiety is a key feature of numerous important biol. active compounds We describe a syn-selective direct Mannich addition reaction that uses ¦Á-iodo thioesters and sulfonyl imines and produces ¦Â-amino thioesters. Enolate formation is achieved by reductive soft enolization. The products of the reaction provide straightforward access to biol. important ¦Â-lactams through a variety of known reactions.

Organic & Biomolecular 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 C7H10O4, Category: catalysis-chemistry.

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

Isiklan, Muhammet published the artcileSynthesis, structural characterization, and cytotoxic activity of new spirocyclic octachlorocyclotetraphosphazenes, Quality Control of 140-28-3, the publication is Phosphorus, Sulfur and Silicon and the Related Elements (2016), 191(9), 1216-1222, database is CAplus.

Octachlorocyclotetraphosphazene, N₄P₄Cl₈, (1) was reacted with N,N’-dibenzylethylenediamine to synthesize partially substituted monospiro- (2), dispiro- (5) and tetraspirocyclotetraphosphazene (8) derivatives The reactions of and with excess pyrrolidine and morpholine produced fully substituted pyrrolidino (3 and 6) morpholino (4 and 7) spirocyclotetraphosphazenes. The structures of the compounds were determined with 1D (¹H, ¹³C, ³¹P, and DEPT) NMR, 2D (HSQC) NMR, ESI-MS, FTIR, and elemental anal. The solid-state structures of and were examined by x-ray crystallog. In 7, intramol. C-H¡¤¡¤¡¤O hydrogen bonds link the mols. into centrosym. dimmers. The cytotoxic activity of all the compounds against human cervix carcinoma cell lines (HeLa) was investigated. The study showed that these compounds exert limited cytotoxic, apoptotic and necrotic effects on HeLa cancer cell lines.

Phosphorus, Sulfur and Silicon and the Related Elements 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, Quality Control of 140-28-3.

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