Tag: M.W=200-250

Beckmann, Jens published the artcileReaction of (t-Bu₂SnO)₃ with Organohalosilanes. Simple Formation of Open-Chain and Cyclic Stannasiloxanes, Recommanded Product: Difluorodiphenylsilane, the publication is Organometallics (1998), 17(26), 5697-5712, database is CAplus.

The synthesis or in situ formation of the new stannasiloxanes R¹R²Si(OSn-t-Bu₂)₂E (2, R¹ = R² = t-Bu, E = O; 22, R¹ = t-Bu, R² = F, E = O; 23, R¹ = R² = Ph, E = O; 24, R¹ = R² = t-Bu, E = S; 25, R¹ = t-Bu, R² = F, E = S; 26, R¹ = R² = Ph, E = S), t-Bu₂Si[OSn(Cl)-t-Bu₂]₂ (3), t-Bu₂(Cl)SnOSi(X)-t-Bu₂ (4, X = Cl; 12, X = H), t-Bu₂Sn(OSiR¹R²O)₂M (5, R¹ = R² = t-Bu, M = Sn-t-Bu₂; 7, R¹ = R² = Ph, M = Sn-t-Bu₂; 9, R¹ = R² = Ph, M = SiPh₂; 18, R¹ = t-Bu, R² = Cl, M = Sn-t-Bu₂; 21, R¹ = t-Bu, R² = F, M = Sn-t-Bu₂), t-Bu₂Sn(OSiXR₂)₂ (10, X = H, R = t-Bu; 11, X = F, R = t-Bu; 13, X = F, R = Et; 14, X = F, R = i-Pr; 15, X = F, R = Ph), t-Bu₂Sn(OSiX₂-t-Bu)₂ (16, X = Cl; 19, X = F), t-Bu₂ClSnOSiCl₂-t-Bu (17), [R¹R²Si(OSn-t-Bu₂)₂O.t-Bu₂SnX₂] (20, R¹ = t-Bu, R² = F, X = F; 27, R¹ = t-Bu, R² = F, X = OH; 28, R¹ = R² = Ph, X = OH), O(t-Bu₂SnOSiPh₂)₂O (29), t-Bu₂Sn(OSiMe₂CH₂)₂ (30), and t-Bu₂SnOSiF-t-BuOSn-t-Bu₂OSit-Bu₂O (31) is described. The compounds were characterized by multinuclear NMR spectroscopy and Moessbauer spectroscopy. The mol. structures of the eight-membered stannasiloxane rings 5, 7, 9, 21, and 29 were determined by x-ray anal. On the basis of NMR and electrospray mass spectrometry a mechanism is proposed involving protonated species for the redistribution reaction between 5 and 21.

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 C12H10F2Si, Recommanded Product: Difluorodiphenylsilane.

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

Korlyukov, Alexander A. published the artcileSi-Fluoro substituted quasisilatranes (N¡úSi) FYSi(OCH₂CH₂)₂NR, Category: catalysis-chemistry, the publication is Journal of Organometallic Chemistry (2009), 694(5), 607-615, database is CAplus.

The reaction of fluorosilanes XYSiF₂ (X = Y = F; X = F, Y = Ph; X = Ph, Y = Me) with diethanolamines and their O-trimethylsilyl derivatives affords novel Si-fluoro substituted quasisilatranes 3, 5 and 9. These compounds were characterized by the multinuclear NMR spectroscopy and x-ray diffraction anal. Exptl. and theor. calculated electron d. distribution functions in crystal structure of 9 have shown that the N ¡ú Si coordination bond corresponds to polar bond with pronounced ionic contribution. Calculated N ¡ú Si bond order in the compound 9 does not exceed 1/3 of the normal Si-N bond. A strong N ¡ú Si coordination bond exists in compounds 3, 5 and 9 the length of which varies in the range 1.98-2.175 ?.

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, Category: catalysis-chemistry.

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

Jiao, Ke-Jin published the artcileNickel-catalyzed electrochemical reductive relay cross-coupling of alkyl halides with alkyl carboxylic acids, Quality Control of 1860-58-8, the publication is Organic Chemistry Frontiers (2021), 8(23), 6603-6608, database is CAplus.

A highly regioselective Ni-catalyzed electrochem. (undivided cell) reductive relay cross-coupling between alkyl carboxylic acids and alkyl bromides was developed. This strategy allowed the direct acylation of benzylic C(sp³)-H bonds in good yields from com. available alkyl carboxylic acids, thus provided an alternative strategy for the synthesis of dialkyl ketones. Various functional groups were tolerated under mild reaction conditions.

Organic Chemistry Frontiers published new progress about 1860-58-8. 1860-58-8 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ether, name is 2-(3-(Benzyloxy)phenyl)acetic acid, and the molecular formula is C15H14O3, Quality Control of 1860-58-8.

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

Li, Yuanming published the artcileAmide Bond Formation through Iron-Catalyzed Oxidative Amidation of Tertiary Amines with Anhydrides, Category: catalysis-chemistry, the publication is Journal of Organic Chemistry (2013), 78(11), 5638-5646, database is CAplus and MEDLINE.

A general and efficient method for amide bond synthesis has been developed. The method allows for synthesis of tertiary amides from readily available tertiary amines and anhydrides in the presence of FeCl₂ as catalyst and tert-Bu hydroperoxide in water (T-Hydro) as oxidant. Mechanistic studies indicated that the in situ-generated ¦Á-amino peroxide of tertiary amine and iminium ion act as key intermediates in this oxidative transformation.

Journal of Organic Chemistry published new progress about 2909-77-5. 2909-77-5 belongs to catalysis-chemistry, auxiliary class Amine,Benzene, name is 2,6-Diisopropyl-N,N-dimethylaniline, and the molecular formula is C14H23N, Category: catalysis-chemistry.

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

Wang, Xiao-Xia published the artcileN-Heterocyclic carbene-palladium(II)-1-methylimidazole complex-catalyzed Suzuki-Miyaura coupling of benzyl carbamates with arylboronic acids, Safety of Bis(4-fluorophenyl)methane, the publication is Organic & Biomolecular Chemistry (2015), 13(47), 11438-11444, database is CAplus and MEDLINE.

The Suzuki-Miyaura coupling of benzyl carbamates with arylboronic acids was achieved in an environmentally benign medium. Using water as the sole solvent, such transformation took place very well to give the desired diarylmethane derivatives in good to almost quant. yields in the presence of a well-defined NHC-Pd(II)-Im complex under mild conditions. It is worth noting here that this is the first example of benzyl carbamates used in the coupling reaction, thus affording a new method for the formation of diarylmethanes by palladium-catalyzed C-O bond activation.

Organic & Biomolecular 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 C3H6O2, Safety of Bis(4-fluorophenyl)methane.

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

Wu, Shuang published the artcileCatalyst-Free Construction of Versatile and Functional CS₂-Based Polythioureas: Characteristics from Self-Healing to Heavy Metal Absorption, Name: N1,N2-Dibenzylethane-1,2-diamine, the publication is Macromolecules (Washington, DC, United States) (2019), 52(22), 8596-8603, database is CAplus.

As typical of sulfur-containing polymers, polythiourea is a promising polymeric material because of its outstanding properties such as self-healing, high refractive index, high dielec. constant, and good coordinating ability to heavy metal ions. However, examples of versatile polythioureas are relatively scarce as a result of the limited methods for their synthesis. Herein, we report a mild and easily accessible strategy for the preparation of polythioureas by a catalyst-free copolymerization of CS₂ and diamines in the absence of an inert/anhydrous atm. The copolymerization of 1,8-diamino-3,6-dioxaoctane (DA1) and carbon disulfide was selected as the model reaction for optimizing conditions for the polymerization process. DA1 and CS₂ afforded well-defined polythiourea P1 with high mol. weight (25.5 kg/mol) in good yield (96%) at 45 ¡ãC, which was shown to be mech. robust and readily self-healable. This method displayed a wide scope, providing 23 polythioureas with structural diversity and high mol. weights in excellent yields from CS₂ and com. available diamines. The aliphatic polythiourea P4 was examined for its ability as a heavy metal absorbent, effectively sequestering Hg²⁺ ions with greater than 99.9% efficiency. Hence, this study provides an easily accessible method for synthesizing various polythioureas with diverse structures and functionalities.

Macromolecules (Washington, DC, United States) 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 C6H12O2, Name: N1,N2-Dibenzylethane-1,2-diamine.

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

Shi, Jiang-Ling published the artcileFe(II)-Catalyzed alkenylation of benzylic C-H bonds with diazo compounds, Formula: C13H10F2, the publication is Chemical Communications (Cambridge, United Kingdom) (2019), 55(28), 4047-4050, database is CAplus and MEDLINE.

An alkenylation of benzylic C(sp³)-H bonds with diazo compounds via carbon cation intermediates with DDQ as the oxidant in the presence of a catalytic amount of Fe(II) was reported. Diphenylmethane, toluene, benzyl Me sulfide and their derivatives was applied as substrates to afford the tetrasubstituted olefin products, which may serve as useful building blocks in organic synthesis.

Chemical Communications (Cambridge, United Kingdom) 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 C21H26Br4S2, Formula: C13H10F2.

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

Liu, Xiangxiang published the artcileFunctional Porous Organic Polymers Comprising a Triaminotriphenylazobenzene Subunit as a Platform for Copper-Catalyzed Aerobic C-H Oxidation, Computed Properties of 457-68-1, the publication is Chemistry of Materials (2019), 31(15), 5421-5430, database is CAplus.

Developing functional porous materials as a platform for the heterogeneous catalytic oxidation reaction provides a good way to solve the high environmental issues resulted by traditional oxidation processes in the industry. This article reported a design and facile synthesis of N-rich functional porous organic polymers with mesopores such as Azo-POP-4, Azo-POP-5, and Azo-POP-6 based on the triaminotriphenylazobenzene subunit for the first time. The nitrogen-rich POPs with the triaminotriphenylazobenzene subunit was found to remove 85% of copper ions from water within 30 min. The as-synthesized Cu@Azo-POP-4 demonstrated high catalytic reactivity and selectivity in aerobic C-H bond oxidation to afford the desired ketones in high yield. In addition, the catalyst could be reused easily five times without decreasing the reactivity, which will help to design catalysts reducing environmental pollution and advance the chem. technol.

Chemistry of Materials 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, Computed Properties of 457-68-1.

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

Li, Yuehui published the artcileHighly Chemoselective Metal-Free Reduction of Phosphine Oxides to Phosphines, Related Products of catalysis-chemistry, the publication is Journal of the American Chemical Society (2012), 134(44), 18325-18329, database is CAplus and MEDLINE.

Unprecedented chemoselective reductions of phosphine oxides to phosphines proceed smoothly in the presence of catalytic amounts of specific Bronsted acids. By utilizing inexpensive silanes, e.g., PMHS or (EtO)₂MeSiH, other reducible functional groups such as ketones, aldehydes, olefins, nitriles, and esters are well-tolerated under optimized conditions.

Journal of the American Chemical Society 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, Related Products of catalysis-chemistry.

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

Jakobsson, Jimmy E. published the artcile[¹¹C]Carbonyl Difluoride-a New and Highly Efficient [¹¹C]Carbonyl Group Transfer Agent, Name: N1,N2-Dibenzylethane-1,2-diamine, the publication is Angewandte Chemie, International Edition (2020), 59(18), 7256-7260, database is CAplus and MEDLINE.

Herein, the synthesis and use of [¹¹C]carbonyl difluoride for labeling heterocycles with [¹¹C]carbonyl groups in high molar activity is described. A very mild single-pass gas-phase conversion of [¹¹C]carbon monoxide into [¹¹C]carbonyl difluoride over silver(II) fluoride provides easy access to this new synthon in robust quant. yield for labeling a broad range of cyclic substrates, for example, imidazolidin-2-ones, thiazolidin-2-ones, and oxazolidin-2-ones. Labeling reactions may utilize close-to-stoichiometric precursor quantities and short reaction times at room temperature in a wide range of solvents while also showing high water tolerability. The overall radiosynthesis protocol is both simple and reproducible. The required apparatus can be constructed from widely available parts and is therefore well suited to be automated for PET radiotracer production We foresee that this straightforward method will gain wide acceptance for PET radiotracer syntheses across the radiochem. community.

Angewandte Chemie, International Edition 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, Name: N1,N2-Dibenzylethane-1,2-diamine.

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