Month: December 2022

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

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

Grawe, Thomas published the artcileSelf-Assembly of Ball-Shaped Molecular Complexes in Water, Related Products of catalysis-chemistry, the publication is Journal of Organic Chemistry (2002), 67(11), 3755-3763, database is CAplus and MEDLINE.

The authors present a simple and versatile access to spheroidal mol. assemblies with pronounced stability in highly polar solvents. These complexes are composed of doubly and triply charged complementary building blocks based on ammonium or amidinium cations and phosphonate anions. Their high thermodn. stability is best explained by the formation of a cyclic array of alternating pos. and neg. charges interconnected by a regular network of H bonds. Association constants reach 10⁶ M^-1 in methanol and often surpass 10³ M^-1 in water. The broad range of binding energies correlates well with the varying degree of preorganization of both complex partners. As a byproduct of these studies, new recognition motifs for histidine and arginine esters and the unsubstituted guanidinium ion are proposed. The addnl. introduction of Me groups in the 2-, 4-, and 6-positions of the central benzene ring in either cations or anions causes a marked drop in the corresponding K_a values of 1 order of magnitude; the related rotational barriers were estimated at 0.3-2.1 kcal/mol. Spontaneous formation of defined 2:1 complexes from three components also was observed

Journal of Organic Chemistry 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, 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

Sager, LeeAnn M. published the artcileBeginnings of exciton condensation in coronene analog of graphene double layer, COA of Formula: C24H12, the publication is Journal of Chemical Physics (2022), 156(15), 154702, database is CAplus and MEDLINE.

Exciton condensation, a Bose-Einstein condensation of excitons into a single quantum state, has recently been achieved in low-dimensional materials including twin layers of graphene and van der Waals heterostructures. Here, we computationally examine the beginnings of exciton condensation in a double layer composed of coronene, a seven-benzene-ring patch of graphene. As a function of interlayer separation, we compute the exciton population in a single coherent quantum state, showing that the population peaks around 1.8 at distances near 2 ?. Visualization reveals interlayer excitons at the separation distance of the condensate. We determine the exciton population as a function of the twist angle between two coronene layers to reveal the magic angles at which the condensation peaks. As with previous recent calculations showing some exciton condensation in hexacene double layers and benzene stacks, the present two-electron reduced-d.-matrix calculations with coronene provide computational evidence for the ability to realize exciton condensation in mol.-scale analogs of extended systems such as the graphene double layer. (c) 2022 American Institute of Physics.

Journal of Chemical Physics published new progress about 191-07-1. 191-07-1 belongs to catalysis-chemistry, auxiliary class Electronic Materials, name is Coronene, and the molecular formula is C24H12, COA of Formula: C24H12.

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

Timelthaler, Daniel published the artcileSelective and Additive-Free Hydrogenation of Nitroarenes Mediated by a DMSO-Tagged Molecular Cobalt Corrole Catalyst, Application In Synthesis of 1772-76-5, the publication is European Journal of Organic Chemistry (2021), 2021(14), 2114-2120, database is CAplus and MEDLINE.

We report on the first cobalt corrole that effectively mediates the homogeneous hydrogenation of structurally diverse nitroarenes to afford the corresponding amines. The given catalyst is easily assembled prior to use from 4-tert-butylbenzaldehyde and pyrrole followed by metalation of the resulting corrole macrocycle with cobalt(II) acetate. The thus-prepared complex is self-contained in that the hydrogenation protocol is free from the requirement for adding any auxiliary reagent to elicit the catalytic activity of the applied metal complex. Moreover, a containment system is not required for the assembly of the hydrogenation reaction set-up as both the autoclave and the reaction vessels are readily charged under a regular laboratory atm.

European Journal of Organic Chemistry 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 C6H8O3, Application In Synthesis of 1772-76-5.

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

Susnik, Marko P. published the artcileSynthesis of novel 4-(2-amino-5-thiazolyl)-pyrimidine-2-amines as potential protein kinase inhibitors, Safety of 1,1-Dimethylthiourea, the publication is Monatshefte fuer Chemie (2009), 140(4), 423-430, database is CAplus.

A short and efficient sequence for the synthesis of a series of 4-(2-amino-5-thiazolyl)-pyrimidine-2-amines I [R¹ = Ph, 4-MeOC₆H₄; R² = MeNH, Me₂N, H₂N; Ph, 3-MeOC₆H₄, 3-(MeCO)C₆H₄] was developed. 1-Phenyl-2-(4-pyrimidinyl)ethanones, obtained via Weinreb’s methodol., were used in a Hantzsch thiazole cyclization reaction, followed by introduction of the aniline moieties via nucleophilic substitution. Graphical abstract

Monatshefte fuer Chemie 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 C15H24BN3O2, Safety of 1,1-Dimethylthiourea.

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

Bream, John B. published the artcileSeven-membered heterocycles. 25. Synthesis of 1- and 5-aryl-2,4-benzothiazepines, Application In Synthesis of 6972-05-0, the publication is Helvetica Chimica Acta (1977), 60(8), 2872-80, database is CAplus.

Benzothiazepines I (R = H, Me, R¹ = H, 7-Cl, R² = H) and II [R¹ = R² = H, R³ = R⁴ = Me, R³R⁴ = (CH₂)_2-4; R¹ = 8-Cl, R² = H, R³R⁴ = (CH₂)₃; R¹ = H, R² = Me, F, R³R⁴ = (CH₂)₃] were prepared by treating the xylyl dibromides III with thioureas and cyclizing with base. The intermediate IV gave V. Benzothiazepines VI (R⁵ = H, 7-Cl, 8-Cl; R⁶ = H, Me, CH₂CH₂Ph; R⁷ = H, Me) and VII [R⁵ = same; R⁸ = H, Me, R⁹ = Me; R⁸R⁹ = (CH₂)_2-3] were obtained by cyclizing VIII.

Helvetica Chimica Acta 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 C3H8N2S, Application In Synthesis of 6972-05-0.

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