Tag: M.W=300-400

Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: Tricyclohexylphosphonium tetrafluoroborate, is researched, Molecular C18H34BF4P, CAS is 58656-04-5, about Pd(0)/PR3-Catalyzed Intermolecular Arylation of sp3 C-H Bonds.Synthetic Route of C18H34BF4P.

Pd(0)-catalyzed intermol. arylation of sp3 C-H bonds of pentafluoro anilides has been achieved using aryl iodides and phosphine ligand I. This protocol can be used to arylate a variety of aliphatic carboxylic acid derivatives, including a number of bioactive drug mols. The use of fluorinated aryl iodides also allows for the introduction of fluorine into a mol. of interest.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Lichtenberger, Dennis L.; Subramanian, Lalitha; Bunz, Uwe; Vollhardt, K. Peter C. published an article about the compound: Pentaerythrityltetrabromide( cas:3229-00-3,SMILESS:BrCC(CBr)(CBr)CBr ).Computed Properties of C5H8Br4. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:3229-00-3) through the article.

Through-space and through-bond interactions between π orbitals in the mols. hepta-1,6-diyne (A), 3,3-diethylpenta-1,4-diyne (B), 4,4-diprop-2-ynylhepta-1,6-diyne (C), 2,2-bis(bromomethyl)-1,3-dibromopropane (D) and 4,4-diethynylhepta-1,6-diyne (E) have been studied using gas-phase HeI photoelectron spectroscopy. The assignments of the photoelectron bands are discussed in relation to the results of extended Hueckel calculations Mixing of the π orbitals with the σ bond framework of the mols. is revealed by broadened band profiles in the π ionization region. Detailed examination of the first ionization of A suggests that one conformation is predominant under the conditions of the experiment The terminal π orbitals are separated by too great a distance for through-space interaction, so the spread of the ionization band is entirely from through-bond interactions. The low-energy ionizations of B correspond to the in-plane and out-of-plane sym. and antisym. combinations of the four terminal π orbitals, each of which has a different interaction with the C-H and C-C bonds of the central carbon atom. The spectra of C and D are very similar to each other, even though C has only alkyne substituents and D has only bromine substituents. The spectrum of E is a complicated mix of some of the features of A and some of the features of B. Extended Hueckel calculations help clarify the number of orbitals in this region and the nature of the orbital interactions.

In addition to the literature in the link below, there is a lot of literature about this compound(Pentaerythrityltetrabromide)Computed Properties of C5H8Br4, illustrating the importance and wide applicability of this compound(3229-00-3).

Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 16961-25-4, is researched, Molecular AuCl4H7O3, about Formation of Si nanorods and discrete nanophases by axial diffusion of Si from substrate into Au and AuPt nanoalloy nanorods, the main research direction is silicon gold platinum nanoalloy nanorod nanophase axial diffusion; 1D-nanostructures; AAO thin films; Au nanoparticles; Au nanorods; AuPt nanoalloy; Pt nanorods; Si nanorods; diffusion; electrodeposition in AAO; platinum silicide.Reference of Hydrogen tetrachloroaurate(III) trihydrate.

Interdiffusion between Si substrate and nanorod arrays of Au, Pt, and AuPt nanoalloys is investigated at temperatures lower than the AuSi eutectic temperature When the nanorod is pure Au, Si diffusion from the substrate is very rapid. Au atoms are completely replaced by Si, converting the nanostructure into one of Si nanorod arrays. Au is diffused out to the substrate. The Au nanorod arrays on Si are unstable. When the nanorod is pure Pt, however, no diffusion of Si into the nanorod or any silicide formation is observed The Pt nanorods are stable on Si substrate. When the nanorods are an alloy of AuPt, interesting interactions occur. Si diffusion into the nanorods is rapid but the diffusing Si readily reacts with Pt forming PtSi while Au diffuses out to the substrate. After annealing, nanophases of Au, Pt, PtSi, and Si may be present within the nanorods. When the Pt content of the alloy is low (12 at%) all Pt atoms are converted to silicide and the extra Si atoms remain in elemental form, particularly near the tip of the nanorods. Hence, the presence of Au accelerates Si diffusion and the ensuing reaction to form PtSi, a phenomenon absents in pure Pt nanorods. When the Au content of the alloy is low, the Si diffusion would cease when all Au atoms have diffused out of the nanorod, thereby arresting the silicide formation resulting in excess Pt in elemental form within the nanorod. This is a technique of making Si nanorods with and without embedded PtSi nanophase consisting of heterojunctions which could have unique properties.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Spiranes. X. 2,2′,3,3′-Tetrahydro-3,3′-spirobis[4H-1,5-benzo-oxathiepine]. Topological equivalency of the diastereoisomers, published in 1973, which mentions a compound: 3229-00-3, mainly applied to spirobisbenzooxathiepine conformation; NMR spirobisbenzooxathiepine; cycloaddition tetrabromoneopentane monothiocatechate, Computed Properties of C5H8Br4.

The title compound (I) was prepared (2%) by heating a Cellosolve solution of o-NaSC6H4ONa with C(CH2Br)4 in sealed glass tube for 100 hr at 160°. The structure of the product was confirmed by ir, uv, and NMR spectra. The preferable conformations were determined by NMR.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Computed Properties of C5H8Br4. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: Pentaerythrityltetrabromide, is researched, Molecular C5H8Br4, CAS is 3229-00-3, about Study of the reaction of the styryl carbanion with 1,3-dibromo-2,2-dibromomethylpropane. Author is Beinert, Gerard; Herz, Jean.

The reaction was studied of styryl carbanions with C(CH2Br)3 [3229-00-3]. A linear product of twice the mol. weight of the precursor and a Br-containing polymer of the same mol. weight as the precursor were obtained. The results were independent of the nature of the solvent and of the cation. The reaction was also studied of potassiophenylethane [2678-95-7] with C(CH2Br)3.

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Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《The optical resolution of spiroheptanedicarboxylic acid》. Authors are Backer, H. J.; Schurink, J. H. B..The article about the compound:Pentaerythrityltetrabromidecas:3229-00-3,SMILESS:BrCC(CBr)(CBr)CBr).Related Products of 3229-00-3. Through the article, more information about this compound (cas:3229-00-3) is conveyed.

According to van’t Hoff (La chimie dans l’espace, p. 29(1875)) compounds of the types I and II should be capable of being resolved into optical components (cf. Aschan, Ber. 35, 3396(1902)), and the same holds for the spirocyclic compounds of the type III. The present paper deals with the preparation and optical resolution of spiroheptanedicarboxylic acid, giving the 1st example of the optical resolution of a compound of type III. The optical activity of compounds of this type favors the tetrahedric formulation of pentaerythritol, whether regular or not (cf. Böeseken and Felix, C. A. 23, 99, 4672). Pentaerythritol was obtained in excellent yields as follows: 190 g. pulverized CaO is added to 210 g. AcH and 800 g. paraformaldehyde in 5 l. water at 60°, the temperature being kept at 60° for 2 more hrs. after the addition After cooling the solution is decolorized with charcoal, neutralized with HCl and evaporated in vacuo until Ca formate seps.; after filtering the hot solution from this precipitate, the filtrate is cooled in ice and gives a deposit of 350 g. pentaerythritol, m. 257°, while a 2nd crop of 100 g. may be obtained from the mother liquor. Sometimes the 1st product m. 200-20° but one crystallization from dilute HCl yields a product, m. 254°, the lowering of the m. p. of the crude product being probably due to the presence of acetals. For the preparation of tetrabromopentaerythritol, 1 kg. PBr3 is added slowly to 250 g. pentaerythritol, on the water bath; after the addition the mixture is heated for 20 hrs. at 160-80° in an oil bath. The crude product is first freed from the tri-Br compound by washing with cold EtOH and is then extracted with boiling EtOH; yield 86%, m. 162°. On heating 140 g. anhydrous NaI, 70 g. of the tetra-Br compound and 300 cc. acetone for 36 hrs. at 100°, tetraiodoerythritol, m. 233°, is obtained; the same result can be obtained on using MeCOEt as a solvent and boiling for 16 hrs. in an open flask. Crystallographic properties (P. Terpstra): monoclinic crystals, β = 113 ° 43′, a : c = 0.619: 1 ; forms observed : (100); (001); (1̅02) and probably (012) and (210̅); angles: (100):(001) = 66°17′; (1̅02): (001) = 47°37′; the optical axes are situated in the plane (010); the sharp bissectrix is nearly perpendicular to (100). The crystals are analogous to those of tetrabromopentaerythritol for which Jaeger (C. A. 3, 2446) found β = 112°52.5′; a:c = 0.6240: 1. The preparation of spiroheptanedicarboxylic acid has already been described by Fecht (C. A. 3, 75) but the yield could be improved considerably in the following way: 80 g. CH2(CO2Et)2 is added to 11.5 g. Na in 500 cc. AmOH; then 40 g. tetrabromopentaerythritol is added and the EtOH, formed by the replacement of the Et group by the Am group in the CH2(CO2Et)2 is removed by distillation until the b. p. reaches 128°, the mixture being finally boiled for 40-50 hrs. The larger part of the AmOH is then distilled off, the remainder being removed by distillation with steam. The remaining ester is then saponified with alc. KOH, a mixture of spiroheptanetetra- and -dicarboxylic acids being formed in which the tetra-compound predominates. On heating the mixture at 200-20°, decarboxylation takes place with the formation of spiroheptanedicarboxylic acid, m. 212°; yield, 75-80%. On carrying out the same reaction with tetraiodoerythritol, a yield of only 20% is obtained. On boiling the acid for 2 hrs. with an excess of aniline, spiroheptanedicarboxanilide, m. 228°, was obtained. After the saponification of the primary reaction product at room temperature with alc. KOH, spiroheptanetetracarboxylic acid, m. 219°, is obtained; normal Ba salt (7 H2O) shows a solubility of 0.068% at 25°. The optical resolution of the dicarboxylic acid was carried out with the normal brucine salt (6 H2O), m. 133°, either by “”cold crystallization”” (cf. Backer and Burgers, C. A. 19, 1128) or in the usual way; normal strychnine salt, m. 238°. After 9 crystallizations of the brucine salt from hot water the optically pure d-rotatory compound is obtained, the following rotations being observed for the NH4 salt: (M)656.3 1.9°, (M)589.5 2.3°, (M)546.3 2.6°, (M)486.1 3.4°. The free acid shows in ether (M)D 1.9°. The optically active compound could not be racemized either by heating the NH4 salt for 12 hrs. at 100° in H2O, or by heating with 0.75 N NaOH during the same time at that temperature

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Article, Journal of Organic Chemistry called Palladium-Catalyzed Hydroarylation, Hydroalkenylation, and Hydrobenzylation of Ynol Ethers with Organohalides: A Regio- and Stereoselective Entry to α,β- and β,β-Disubstituted Alkenyl Ethers, Author is Cui, Weijian; Yin, Jing; Zheng, Renwei; Cheng, Cungui; Bai, Yihui; Zhu, Gangguo, which mentions a compound: 58656-04-5, SMILESS is F[B-](F)(F)F.[PH+](C1CCCCC1)(C2CCCCC2)C3CCCCC3, Molecular C18H34BF4P, Electric Literature of C18H34BF4P.

A Pd-catalyzed reductive addition of organohalides, including aryl, alkenyl, and benzyl halides, to ynol ethers has been realized in the presence of 2-propanol, giving α,β- and β,β-disubstituted olefinic ethers in satisfactory yields with excellent regio- and stereoselectivity. It represents the first highly regio- and stereoselective hydroarylation, hydroalkenylation, and hydrobenzylation of ynol ethers.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: Pentaerythrityltetrabromide(SMILESS: BrCC(CBr)(CBr)CBr,cas:3229-00-3) is researched.HPLC of Formula: 1219741-50-0. The article 《Organization of Tetrahedral Chalcogenide Clusters Using a Tetrahedral Quadridentate Linker》 in relation to this compound, is published in Inorganic Chemistry. Let’s take a look at the latest research on this compound (cas:3229-00-3).

Using predesigned tetrahedral quadridentate linker tetrakis(4-pyridyloxymethylene)methane (TPOM) as the organic linker, tetrahedral P1 clusters ([Cd8S(SPh)16]2-) and C1 clusters ([Cd17S4(SPh)28]2-) were assembled into beltlike {[Cd8S(SPh)14](TPOM)}n (MCOF-9) or chainlike {[Cd17S4(SPh)26](TPOM)}n (MCOF-10) configurations, as determined by single-crystal x-ray diffraction. The onset of optical absorptions of MCOF-9 and MCOF-10 is ∼400 and 420 nm, resp. The thermal anal. shows that both materials are stable up to 250°.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Jankowiak, Aleksandra; Kanazawa, Junichiro; Kaszynski, Piotr; Takita, Ryo; Uchiyama, Masanobu published an article about the compound: Tricyclohexylphosphonium tetrafluoroborate( cas:58656-04-5,SMILESS:F[B-](F)(F)F.[PH+](C1CCCCC1)(C2CCCCC2)C3CCCCC3 ).Safety of Tricyclohexylphosphonium tetrafluoroborate. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:58656-04-5) through the article.

Ion pairs 2[Pyr] and 3[Pyr] containing [closo-1-CB11H11-1-Ph]- as the structural element were synthesized and their liquid crystalline properties were investigated by thermal and optical methods. Their mesogenic behavior was compared to that of the analogous series 1[Pyr] having a COO linking group between the benzene ring and the cluster, and the observed structure-property relationships are discussed in the context of general trends in related non-ionic liquid crystals.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Photoelectrochemical detection for 3,3′,4,4′-tetrachlorobiphenyl in fish based on synergistic effects by Schottky junction and sensitization, published in 2022-01-01, which mentions a compound: 16961-25-4, mainly applied to fish 3344tetrachlorobiphenyl photoelectrochem Schottky junction sensitization; 3,3′,4,4′-tetrachlorobiphenyl; Local surface plasmon resonance; Photoelectrochemical aptasensor; Schottky junction; Signal amplification, Category: imidazoles-derivatives.

In this study, a novel signal amplification strategy on photoelectrochem. (PEC) aptasensor was designed for high-sensitivity and -selectivity detection of 3,3′,4,4′-tetrachlorobiphenyl (PCB77) on the basis of Schottky junction and sensitization. First, the Schottky barrier not only provided an electron-transfer irreversible passage from CuO to Au Nanoparticles (NPs) but also generated excellent local surface plasmon resonance between CuO and Au NPs, thus improving the efficiency of charge separation and light absorption. Second, to further improve the response of the PEC aptasensor under the action of the sensitization, the complementary-DNA-functionalized CdS quantum dots were introduced onto the surface of CuO/Au NPs via hybridization of the target aptamer. The PEC aptasensor exhibited a low detection limit of 17.3 pg L-1, and a wide linear response was shown at a range of 0.2-220 ng L-1 depending on the variation of photocurrent before and after incubation.

There are many compounds similar to this compound(16961-25-4)Category: imidazoles-derivatives. if you want to know more, you can check out my other articles. I hope it will help you，maybe you’ll find some useful information.

Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem