Category: 33100-27-5

Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn’t involve a screen. 33100-27-5, C10H20O5. A document type is Article, introducing its new discovery., Safety of 1,4,7,10,13-Pentaoxacyclopentadecane

The insoluble calcocene Ca(eta5-C5H 5)2 readily dissolves after addition of Lewis bases. Monodentate donor solvents such as tetrahydrofuran (thf), pyridine (py), and tetrahydropyran (thp) form complexes of the type [(L)2CaCp 2] (L = thf (1), py (2), thp (4)). Bidentate Lewis bases such as 1,2-bis(dimethylamino)ethane (tmeda) and 1,2-dimethoxyethane (dme) act as chelating ligands in complexes of the type [(L)CaCp2] (L = tmeda (3), dme (5)). Multidentate ethers of the type MeO-(CH2CH 2O)n-Me (n = 2, diglyme; n = 3, triglyme; n = 4, tetraglyme) bind in all cases as tridentate Lewis bases of the type [(eta3-L)CaCp2] (L = diglyme (6), triglyme (7), tetraglyme (8)), but the formation of [(L)CaCp]+ cations with these ethers or even with crown ethers was not observed. However, partial hydrolysis of 1 releases one Cp ligand, and from this reaction mixture crystalline [(15C5)CaCp]+[(thf)CaCp3]- (9) precipitates in the presence of 15-crown-5 (15C5). Calcocene behaves as a pseudohalide complex of calcium, and the reaction of 1 or 5 with phenyllithium in the presence of DME yields heteroleptic [(dme)(eta5-Cp)Ca(mu-Ph)]2 (10), which forms a dimer with bridging phenyl groups in the solid state. Especially this last reaction offers an expansion of organocalcium chemistry.

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Reference：
Chiral Catalysts,
Chiral catalysts – SlideShare

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a Article，once mentioned of 33100-27-5, COA of Formula: C10H20O5

The neutron and X-ray structures of [Na(15-crown-5)][BH4] and [Na(15-crown-5)][AlH4], respectively, are reported, along with a topological analysis of their DFT-computed charge densities that explores the bonding between the anionic complex hydride [EH4]- (E = B, Al) and the counterion [Na(15-crown-5)]+. In each case, the interaction is weak and mainly electrostatic in nature; however, notable differences are observed in the manner in which [BH4]- and [AlH4]- bind to the metal, which explains their different coordination modes. A range of unconventional E-H???H-C contacts is revealed to play an important role in the overall bonding and crystal packing of both complexes. These interactions can be classified as weak dihydrogen bonds based on the atoms in molecules approach.

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Reference：
Chiral Catalysts,
Chiral catalysts – SlideShare

The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a Article，once mentioned of 33100-27-5, category: chiral-catalyst

Crown ethers, which feature circular and variable coordination sites of oxygen atoms, may be ideal for the symmetry control of the mononuclear lanthanide single-molecule magnets (SMMs) by double-deckering the central metal ions. Herein, a series of Dy(iii)-crown-ether complexes have been prepared to test this hypothesis. With a 12-crown-4 ether (12-C-4), a half-sandwich complex Dy(12-C-4)(NO3)3 (1) was obtained, while by changing the counter-anions the double-deck-like complex Dy(12-C-4)2(CH3CN)(ClO4)3 (2) could be prepared. On further adjusting the reaction conditions, a dinuclear complex Dy2(12-C-4)2(ClO4)4(OH)2(H2O)2 (3) was isolated. With the aid of a 15-crown-5 ether (15-C-5), another complex [Dy(12-C-4)(15-C-5)(CH3CN)][Dy(12-C-4)(15-C-5)]2(CH3CN)2(ClO4)9 (4) with a double-decker structure was formed. For the 18-crown-6 ether (18-C-6), two complexes [Dy(18-C-6)(NO3)2]ClO4 (5) and [Dy(18-C-6)(NO3)2]BPh4 (6) have been synthesized using different charge balancing anions. Interestingly, the cationic components in complexes 5 and 6 are isomeric. The only difference is the dihedral angles of the two chelating NO3- groups, namely 90 and 68 for 5 and 6. Systematic magnetic studies reveal that complexes 1-6 show no SMM behaviour in a zero dc field above 2 K, which is probably due to the ligand field provided by crown ethers is too weak to have much impact on the electronic structures of the central Dy(iii) ions. However, when the Dy(iii) ions are simultaneously coordinated by some counter-anions such as NO3- and OH-, apparent field-induced SMM behaviors can be observed in complexes 1, 3, 5 and 6. Moreover, we found that the axial coordination anions in complexes 5 and 6 have evident impact on the magnetic relaxation behaviours. For the 90 case (complex 5) the energy barrier for magnetisation reversal (DeltaE) is 63 K, which is much higher than 43 K for the 68 case (complex 6).

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Reference：
Chiral Catalysts,
Chiral catalysts – SlideShare

Application of 33100-27-5. Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane

Our recently reported novel green chemistry tool was effectively used for opening cyclic ethers to produce alpha-iodo- and bromoalkanols. The synthesis of 4-iodobutanoic acid from gamma-butyrolactone has also been described. The method is based on the use of a dried Dowex H+/NaX (X = Br, I)-system, which is effective at producing alpha-iodoalkanols and some alpha-bromoalkanols from commercially available cyclic ethers. Additionally, opening of three different crown ethers to form alpha-iodo(polyethylene)glycols with various chain lengths is demonstrated. Haloalkanols are important building blocks in synthetic chemistry e.g. for medicinal chemistry purposes.

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Reference：
Chiral Catalysts,
Chiral catalysts – SlideShare

Application of 33100-27-5, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a Article，once mentioned of 33100-27-5

Alkali metal complexes of K or Cs as the first structurally authenticated examples of monomeric lithium species by three amide anions were prepared. The compounds crystallised as solvent-separated ion triplets incorporating the monomeric species. The compounds were products of a heavier alkali metal mediated ligand cleavage reaction, and was viewed as the products of an incomplete metathesis reaction due to their heterobimetallic nature. The monomeric lithium centre coordinated by three amide anions were seperated using a larger macrocycle.

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Reference：
Chiral Catalysts,
Chiral catalysts – SlideShare

In an article, published in an article, once mentioned the application of 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane,molecular formula is C10H20O5, is a conventional compound. this article was the specific content is as follows.category: chiral-catalyst

The use of the tripodal ligands tris[(N?-tert-butylureaylato)-N- ethyl]aminato ([H3buea]3-) and the sulfonamide-based N,N?,N?-[2,2?,2?-nitrilotris(ethane-2,1-diyl)]tris(2,4, 6-trimethylbenzene-sulfonamidato) ([MST]3-) has led to the synthesis of two structurally distinct In(III)-OH complexes. The first example of a five-coordinate indium(III) complex with a terminal hydroxide ligand, K[In IIIH3buea(OH)], was prepared by addition of In(OAc) 3 and water to a deprotonated solution of H6buea. X-ray diffraction analysis, as well as FTIR and 1H NMR spectroscopic methods, provided evidence for the formation of a monomeric In(III)-OH complex. The complex contains an intramolecular hydrogen bonding (H-bonding) network involving the In(III)-OH unit and [H3buea]3- ligand, which aided in isolation of the complex. Isotope labeling studies verified the source of the hydroxo ligand as water. Treatment of the [InIIIMST] complex with a mixture of 15-crown-5 ether and NaOH led to isolation of the complex [15-crown-5?NaI-(mu-OH)- InIIIMST], whose solid-state structure was confirmed using X-ray diffraction methods. Nuclear magnetic resonance studies on this complex suggest it retains its heterobimetallic structure in solution.

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Reference：
Chiral Catalysts,
Chiral catalysts – SlideShare

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a Article，once mentioned of 33100-27-5, Product Details of 33100-27-5

Synthetic, structural and luminescence studies of stoichiometric crown ether compounds of Mn2+ in well-deifned coordination environments were undertaken in an effort to understand the origin of emitting crystal defects found in cubic F23 [(K18C6)4MnBr4][TlBr4]2 crystals (Fender, N. S.; et al. Inorg. Chem. 1997, 36, 5539). The new compound [Mn(12C4)2][MnBr4]2[N(CH3) 4]2 (3) features Mn2+ ions in eight- and fourfold coordination environments of [Mn(12C4)2]2+ and MnBr42- respectively, while Mn2+ in [Mn(15C5)(H2O)2][TlBr5] (4) is in the sevenfold coordination polyhedron of [Mn(15C5)(H2O)2]2+. Crystal data for 3: monoclinic, P21/c (No. 14); a = 14.131(3) A,b = 12.158(1) A = 14.239(2) A beta = 110.37(1), Z = 2, R1 = 0.039 and wR2 = 0.083. For 3, long-lived emission (77 K decay rate ?3 × 10 s-1) from [Mn(12C4)2]2+ (the first for eight-coordinate Mn2+ in stoichiometric compounds) is observed (lambdamax ?546 nm) along with that of the sensitizing MnBr42- (lambdamax ?513 nm), which is partially quenched. Emission from the seven-coordinate [Mn(15C5)(H2O)2]2+ species of 4 and [Mn(15C5)(H2O)2]-[MnBr4] (the first for seven-coordinate Mn2+ in stoichiometric compounds) peaks at lambdamax ?592 nm. Unusually intense absorptions attributable to the seven-coordinate species are observed at 317 (2T2(2I) ? 6A1), 342 (4T1(4P) ? 6A1), 406 (4E(4G) ? 6A1), and 531 (4T1(4G) ? 6A1) nm.

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Reference：
Chiral Catalysts,
Chiral catalysts – SlideShare

33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5, belongs to chiral-catalyst compound, is a common compound. In a patnet, once mentioned the new application about 33100-27-5, COA of Formula: C10H20O5

We have measured the self-diffusion coefficient and density properties of 15-crown-5 and 18-crown-6 ethers in aqueous (D2O) and CDCl3 solutions in the range of 0 to 6 m concentration of ethers. Some measurements for 1 m crown in D2O with various concentrations of alkali-metal bromides are also reported. It has been observed that self-diffusion coefficients of the crowns are small and decrease with increase in concentration of the crown both in D2O and CDCl3 solutions. The density data in D2O were used to obtain the apparent molar volumes of the crown phiV as a function of concentration. It has been observed that psiv goes through a minimum at about 2 m of crown concentration. Similar measurements and calculations of 1 m crowns in D2O in various salt solutions indicate that D varies peculiarly as a function of salt concentration. In case of KBr solutions, D increases initially and goes through a flat maximum at about 1-2 m of KBr concentration. The apparent molar volumes of the salts calculated in 1 m 18-crown-6 and 1 m 15-crown-5 solutions exhibit anomalous dependence on salt concentration. These results are explained on the basis of solute-solute, solute-solvent, ion-crown and ion-ion interactions in solution phase. VCH Verlagsgesetlschaft mbH, 1997.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.COA of Formula: C10H20O5. In my other articles, you can also check out more blogs about 33100-27-5

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Chiral Catalysts,
Chiral catalysts – SlideShare

Electric Literature of 33100-27-5, An article , which mentions 33100-27-5, molecular formula is C10H20O5. The compound – 1,4,7,10,13-Pentaoxacyclopentadecane played an important role in people’s production and life.

The synthesis and spectroscopic characterisation of [ScCl(15-crown-5)(MeCN) ][SbCl6]2, [ScCl2(18-crown-6)][FeCl 4] and [ScCl2([15]aneS2O3)] [FeCl4] ([15]aneS2O3 = 1,4-dithia-7,10,13- trioxacyclopentadecane) are reported, the last containing the first example of thioether-scandium(III) coordination. The structure of [ScCl(15-crown-5)(MeCN)]- [SbCl6]2 reveals a pentagonal bipyramidal cation with axial Cl and MeCN, whilst [ScCl2(18-crown-6)][FeCl 4] is also pentagonal bipyramidal with axial Cl ligands. 1H and 45Sc NMR spectroscopies have been used to study the spcciation in the ScCl3/18-crown-6 system in the presence of the Lewis acids SbCl3 and FeCl3 in anhydrous MeCN. Hydrolysis of any of the above complexes and of [Sc(12-crown-4)2] 3+ (formed from ScCl3(thf)3, crown and SbCl5), results in the formation of [ScCl3(H 2O)3]-crown, the solution NMR spectra of which show a common scandium species and uncomplexed crown ether. The structure of [ScCl 3(H2O)3]·18-crown-6 reveals a mer octahedral scandium species which is hydrogen bonded via the scandium-coordinated water to the 18-crown-6 (secondary coordination) leading to infinite chains. Similar complexes have been isolated directly from reaction of ScCl3·6H2O and the crown ethers in absolute ethanol, including [ScCl3(H2O)3] n·(crown) (H = 1 or 2, crown = 18-crown-6; n= 2, crown = 15-crown-5 or 12-crown-4). Hydrated scandium nitrate and the crown ethers react in ethanol solution to form a surprisingly diverse range of structural types containing the crown ethers hydrogen bonded to the scandium-aquo-nitrato or scandium-aquo-hydroxo-nitrato complexes. X-Ray crystal structures are reported for [Sc(H2O)2(NO3)3]·(12- crown-4)2, [Sc(H2O)4(NO3) 2]NO3·15-crown-5 and [Sc2(NO 3)2(H2O)6(OH)2](NO 3)2·12-crown-4. However, in the related [Sc 2(NO3)4(H2O)4(OH) 2[Na(12-crown-4)2](NO3HH2O) 3 the hydrogen bonding occurs between the lattice water and the scandium dimer unit. The Royal Society of Chemistry 2003.

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Reference：
Chiral Catalysts,
Chiral catalysts – SlideShare

A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 33100-27-5, Name is 1,4,7,10,13-Pentaoxacyclopentadecane, molecular formula is C10H20O5. In a Article，once mentioned of 33100-27-5, HPLC of Formula: C10H20O5

An electrochemical method based on potentiometric stripping analysis (PSA) employing a hexathia 18C6 (HT18C6) and rice husk (RH) modified carbon paste electrode (HT18C6-RH-CPE) has been proposed for the subnanomolar determination of antimony. The characterization of the electrode surface has been carried out by means of scanning electron microscopy, cyclic voltammetry, electrochemical impedance spectroscopy and chronocoulometry. By employing HT18C6-RH-CPE, a 12-fold enhancement in the PSA signal (dt/dE) was observed as compared to plain carbon paste electrode (PCPE). Under the optimized conditions, dt/dE (sV-1) was proportional to the Sb(III) concentration in the range of 1.42×10-8 to 6.89×10-11M (r=0.9944) with the detection limit (S/N=3) of 2.11×10-11M. The practical analytical utilities of the modified electrode were demonstrated by the determination of antimony in pharmaceutical formulations, human hair, sea water, urine and blood serum samples. The prepared modified electrode showed several advantages, such as simple preparation method, high sensitivity, very low detection limit and excellent reproducibility. Moreover, the results obtained for antimony analysis in commercial and real samples using HT18C6-RH-CPE and those obtained by inductively coupled plasma-atomic emission spectrometry (ICP-AES) are in agreement at the 95% confidence level.

Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.HPLC of Formula: C10H20O5. In my other articles, you can also check out more blogs about 33100-27-5

Reference：
Chiral Catalysts,
Chiral catalysts – SlideShare