Category: 33100-27-5

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, Recommanded Product: 33100-27-5

Use of metal carbonyls in the formation of [H5O2+¡¤15-crown-5][MOCl4(H2O)-], (M=Mo, W), and a second sphere coordination complex in [mer-CrCl3(H2O)3¡¤15-crown-5]

The reactions of M(CO)6 (M=Mo, W) with HCl(g) in the presence of 15-crown-5 and H2O in toluene have been explored. These reactions were promoted with the use of UV radiation and formed liquid clathrates almost immediately upon reaction. For each metal species, oxidation of the metal center from either [0] to [+3] in the case of Cr or from [0] to [+5] in the case of both Mo and W occurred. For chromium, a new isomer of CrCl3(H2O)3 was generated in the second-sphere coordination complex, [mer-CrCl3(H2O)3¡¤15-crown-5] (1), which crystallized from the liquid clathrate layer in the reaction mixture. For molybdenum and tungsten the isostructural complexes, [H5O2+¡¤15-crown-5][MOCl4(H2O)-], (M=Mo (2), M=W, (3)) rapidly formed where the H5O2+ oxonium ion was stabilized within the liquid clathrate layer. The structures of each of these complexes were established by X-ray crystallography. Complex 1 crystallizes in the monoclinic space group P21/n with a=9.261(3), b=16.182(3), c=12.899(5) A, beta=107.87(1), V=1839 A3 and Dcalc.=1.568 g cm-3 for Z=4. Refinement based on 3217 observed reflections led to a final R value of 0.085. Complex 2 crystallizes in the monoclinic space group P21/n with a=12.840(3), b=12.053(1), c=13.290(2) A, beta=94.26(3), V=2051 A3 and Dcalc.=1.720 g cm-3 for Z=4. Refinement based on 3208 observed reflections led to a final R value of 0.051. Complex 3 is isostructural with 2 with a=12.805(2), b=12.024(1), c=13.293(2) A, beta=94.25(1), V=2041 A3 and Dcalc.=2.015 g cm-3 for Z=4. Refinement based on 2543 observed reflections led to a final R value of 0.045.

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Additivity of the partial molar volumes of organic compounds

A critical test of additivity for partial molar volume has been made at 25 deg C in CCl4 with polyethylene glycol dimethyl ethers, crown ethers, cycloalkanes, n-alkanes, and others.Plots of partial molar volume at definite dilution <*> againts the properly chosen number of repeating unit (n) are linear except for small cyclic molecules, and the slopes of homologous straight chain and ring compounds are the same.The values of <*> extrapolated to n = 0 for cycloalkanes and crown ethers support the validity of the contribution due to the translation kinetic energy that has been predicted recently on a theoretical basis.The importance of packing efficiencies around the solute molecules has been examined by means of simple models.

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Spongistatins: Biological activity and synthetic studies

Following the isolation from marine sponges, in 1993, of a family of related highly oxygenated macrolactones named spongistatins, altohyrtins and cinachyrolides, impressive synthetic efforts have been devoted to the synthesis of these macrolides. Their highly potent activity as cancer cells growth inhibitors combined with a fascinating and complex architecture has prompted synthetic organic chemists to develop efficient routes to these molecules. From the first total syntheses by the groups of Evans and Kishi in 1997 and 1998 which delivered milligram quantities of spongistatins/altohyrtins, further intensive studies have led to new pathways with practical solution to provide gram scale amounts of key intermediates. The present review focuses on biological properties and synthetic issues related to these marine macrolides.

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Complexes of [(dadi)Ti(L/X)]m That Reveal Redox Non-Innocence and a Stepwise Carbene Insertion into a Carbon-Carbon Bond

The addition of donors to (dadi)Ti(THF) (1-THF, dadi = [{-CH=N(1,2-C6H4)N(2,6-iPr2-C6H3)}2]n) afforded the adducts [(dadi)Ti(L/X)]m (1-L, m = 0, N2CPh2; m = -1, X = Cl-, N3-, OiPr-, CH3-, neoPe-, CH=CH2-, CCPh-, CCTMS-, H(D)-). In all adducts, the chelate was in the (dadi)4- redox state. For certain anions, evidence for intimate binding of the Li+ counterion was explored spectroscopically. Treatment of 1-THF with PhHCN2, yielded {PhC3H3(-NC6H4-2-NAr)2}Ti(THF) (3, Ar = 2,6-iPr2-C6H3), which contains a cyclopropanated dadi ligand. The mechanism was explored by calculations, and the addition of Ph2CN2 to 3 produced a nacnac derivative, {PhC(CHNC6H4-2-NAr)2}Ti(I?2-HNNCPh2) (4, Ar = 2,6-iPr2-C6H3), generated via hydrogen transfer from the cyclopropane.

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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.Application In Synthesis of 1,4,7,10,13-Pentaoxacyclopentadecane

Steric and stereoelectronic effects in aza crown ether complexes

Stability constants and enthalpy changes determined by calorimetric titrations and supported by selected NMR titrations are reported for the complexation of sodium and potassium cations with 18 different crown ethers containing nitrogen atoms with different number, location and substitution pattern. The data, measured in methanol mostly with potassium salts, are compared to literature data; they show striking differences between all-oxygen analogs and the macrocycles with NH groups. In contrast, affinities with aza crown ethers bearing alkyl groups at the nitrogen as well as with the cryptand [2.2.2] come closer to the complexation free energies predicted from the number and electron donating capacity of the ligand heteroatoms. This is rationalised on the basis of molecular mechanics calculations, showing that a NH-containing crown predominates in conformations with axial N lone pairs, due to their repulsive electrostatic interactions with the ring oxygen atoms. Replacement of the hydrogen by alkyl groups forces the lone pairs to an equatorial position, thus enabling better complex formation, as borne out by experiment. In line with these arguments the IgK differences are with some exceptions more due to DeltaH than to TDeltaS differences. The calorimetric data show linear isoequilibrium correlations between TDeltaS and DeltaH, with slopes between those observed with other crown ether and cryptand complexes. Preliminary investigations of some synthetic macrocyclic amide precursors yield appreciable complexation only, if the two carbonyl oxygens can come in close contact with the guest cation. Computer aided molecular modelling shows that this is possible in a small 15C5-derivative, in which the polyethylenglycol cycle only serves as ring template without binding contributions from the ether oxygen atoms.

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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, Recommanded Product: 33100-27-5

Nitrido Complexes of Molybdenum (V); Syntheses, IR, and EPR Spectra. Crystal Structure of 24*2THF

The molybdenum nitrido complexes (1), 2 (2), and 24*2THF (3) have been prepared by reactions of MoNCl3 with sodium naphthalide in tetrahydrofurane (THF) in the presence of 15-crown-5.According to the EPR spectra and in agreement with IR spectra. 1 forms dimeric ions 22- via chloro bridges, whereas tetrameric units 48- and 44- are present in 2 and 3, respectively. 3 was characterized by an X-ray structure determination: space group P21/c, Z = 2, 1964 observed unique reflexions, R = 0.12.Lattice dimensions at -90 deg C : a = 1173(1); b = 2083(3); c = 1750(2) pm; beta = 112.3(7) deg.The structure consists of an ensemble of associated ions around the central 44- unit.In the latter, the four Mo atoms from a square and are bridged via linear, symmetric Mo<*>N-Mo groups.The (MoN)4 square is enclosed in a cube of eight Cl atoms, the Mo atoms occupying four of the cube edges.Two Na+ ions are situated in the centres of two opposing cube faces, each of the other two Na+ ions is coordinated with two Cl atoms outside of the cube; these Na+ ions are also coordinated with one THF molecule and with one 15-crown-5 molecule, respectively.The crystal also contains non-coordinated THF molecules, which exhibit strong thermal motion and/ or disorder. – Keywords: Nitrido Complexes of Molybdenum(V), Synthses, IR Spectra, EPR Spectra, Crystal Structure

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Spectroscopic Investigation of the Ion -; Crystal Structure of

(X = Cl, Br) and have been prepared by reactions of X2V(N3S2) with sodium fluoride in acetonitrile suspensions in the presence of 15-crown-5 and benzo-15-crown-5, respectively.The 15-N-labeled complex was also prepared and characterized by 15N, 19F, and 51V NMR spectra, as well as by IR spectroscopy.Whereas the crystal structure of , owing to disorder of the crown ether molecule, could be refined only to an R-value of 0.16 (space group C2/m, Z = 4, a = 1995.4(11); b = 1016.2(6); c = 1047.2(8) pm; beta = 100.83(4) deg at -65 deg C), the crystal structure of the corresponding was determined without complications.Space group P21/c, Z = 4, 5565 observed independent reflexion.R = 0.036.Lattic dimensions at 20 deg C; a = 1198.9(6); b = 970.3(5); c = 1918.2(10) pm; beta = 93.74(3) deg.The compound forms ion pairs, in which the sodium atom is seven-coordinated by the oxygen atoms of the crown ether molecule, the fluorine atom and one chlorine atom of the trigonal-bipyramidal – unit.The vanadium atom is part of a planar VN3S2 ring; fluorine and two nitrogen atoms of the cyclothiazeno ring occupy the equatorial positions. – Keywords: Fluoro-Chloro-Cyclothiazeno Complexes of Vanadium, 15N NMR Spectra; 51V NMR Spectra, IR Spectra, Crystal Structure

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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, Application In Synthesis of 1,4,7,10,13-Pentaoxacyclopentadecane

Protonated primary amines induced thymine quintets studied by electrospray ionization mass spectrometry and density functional theory calculations

As the novel magic number clusters of nucleobases, the thymine quintets induced by ammonium ion (NH4+), and particularly by its derivatives such as protonated alkyl amines and protonated aryl amines, have been studied by electrospray ionization mass spectrometry (ESI-MS) and density functional theory (DFT) calculations. The DFT-optimized geometry of NH 4+ induced thymine quintet ([T5+NH 4]+) reveals some new features including three additional hydrogen bonds between NH4+ and its surrounding thymine molecules when compared with that of the alkali metal ions induced thymine quintets. In addition, the fourth hydrogen atom of NH4+ is sticking out the assembly, and, thus, it might be replaced by an organic group R to form the protonated primary amine induced thymine quintet ([T 5+R-NH3]+), a hypothesis that has been confirmed by both DFT calculations and ESI-MS experiments. Furthermore, the relative abilities of the different protonated primary amines for inducing the thymine quintets are investigated by ESI-MS competition experiments, and the results have shown a clear trend of stronger ability as the alkyl chain gets longer or as the aryl ring gets larger for the alkyl amines or the aryl amines. Two basic influence factors are consequently identified: one is the ability of the alkyl amine to accept proton, another is the pi-pi stacking interaction between the aryl ring and the pi-surface of the thymine molecule(s), whose explanations are strongly supported by multiple types of thermochemical data, various control experiments and DFT calculations.

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CAPTODATIVE SUBSTITUENT EFFECTS – PART XXII. RADICAL DEHYDRODIMERISATION AND BRIDGED DEHYDRODIMERISATION OF MACROCYCLIC POLYETHERS

Crown ethers are dehydrodimerized in good yields when treated with ditert.-butyl peroxide in UV light.Bridged dehydrodimers of crown ethers are obtained in the presence of alpha-tert.-butylmercaptoacrylonitrile.Cation extraction study was performed in order to compare the binding properties of dehydrodimers vs. monomers.

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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, Computed Properties of C10H20O5

Preparations and Structural Correlations for the Complexes of MIII Halides (M = As, Sb, Bi) with Crown Ethers: Structures of AsCl3*12-Crown-4, AsCl3*15-Crown-5, SbCl3*12-Crown-4 and BiCl3*15-Crown-5 and an Evaluation of Relative Binding Strengths for Crown Ligands

The preparations and structures of four new complexes are reported in the family of MCl3*crown complexes (M = As, Sb, Bi; crown = 12-crown-4, 15-crown-5, 18-crown-6).The structures of the eight isolable members of the family are compared and trends established.The M-O bonding is much weaker than the M-Cl bonding, becoming stronger in the order Bi > Sb > As and 12-crown-4 > 15-crown-5 > 18-crown-6.The Cl-M-Cl angles are reduced compared to those in the free halides, but the M-Cl bonds are only slightly lengthened.The crown torsion angles show characteristic patterns involving gauche C-C bonds and alternating gauche and anti C-O bonds

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