Category: 1806-29-7

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HYDROGEN BONDED COMPLEXES IV; UREA-PHENOL COMPLEXES

A number of crystalline, hydrogen-bonded complexes of ureas and phenols are reported.The most commonly observed urea-phenol ratio is 1:1, but some complexes with ratios of 2:1, 1:2 and 1:3 were encountered.The structures of these complexes are discussed and one degradative reaction is described.

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Electric Literature of 1806-29-7, An article , which mentions 1806-29-7, molecular formula is C12H10O2. The compound – 2,2-Biphenol played an important role in people’s production and life.

Conformational preferences of monocyclic pentaoxyphosphoranes varying in ring size

New monocyclic pentaoxyphosphoranes 1-4, 6 and the furanosyl derivative, 7, were synthesized from the reaction of tris(2,6-dimethylphenyl) phosphite (5) with a diol or a quinone. The pentacoordinated derivatives 1-4 were studied by X-ray analysis and represent the first structurally chartacterized monocyclic oxyphosphoranes that have six-, seven-, and eight-membered rings. All possess trigonal-bipyramidal geometries with the rings spanning apical-equatorial positions. Retention of these structures in solution is indicated by 1H, 13C, and 31P NMR. Twist-boat, rowboat, and distorted-tub conformations are found for the six- (1), seven- (2), and eight- (4) membered ring derivatives, respectively. Phosphorane 3 has a more planar phosphorinane ring, a consequence of ring unsaturation. Variable-temperature 1H and 13C NMR establish nonrigid behavior supporting a simple Berry pseudorotation in which the rings exchange apical-equatorial positions. It is concluded that six-membered rings of pentaoxyphosphoranes prefer apical-equatorial sites of a TBP. The preferred conformation of saturated six-membered rings is generally that of a boat. Phosphorane 1 crystallizes in the monoclinic space group C2/c with a = 29.392 (8), b = 11.420 (5), c = 16.379 (2) A, beta= 92.22 (1), and Z = 8. Compound 2 crystallizes in the monoclinic space group P21 with a = 12.268 (2), b = 9.916 (3), c = 12.625 (2) A, beta = 91.79 (1), and Z = 2. The monocyclic derivative 3 crystallizes in the monoclinic space group P21/c with a = 20.114 (6), b = 9.554 (2), c = 17.178 (3) A, beta = 114.24 (2), and Z = 4. Phosphorane 4 crystallizes in the triclinic space group P1 with a = 9.690 (2), b = 15.414 (4), c = 21.350 (5) A, alpha = 93.07 (2), beta = 90.17 (2), gamma = 99.97 (2), and Z = 4. The final conventional unweighted residuals are 0.056 (1), 0.039 (2), 0.038 (3), and 0.076 (4).

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In an article, published in an article, once mentioned the application of 1806-29-7, Name is 2,2-Biphenol,molecular formula is C12H10O2, is a conventional compound. this article was the specific content is as follows.Recommanded Product: 1806-29-7

SUBSTITUTED PHOSPHAZENE COMPOUNDS AND THEIR USE AS FLAME RESISTANCE ADDITIVES FOR ORGANIC POLYMERS

Cyclic phosphazene compounds that are substituted with phosphorus-containing groups are effective flame retardants for organic polymers.

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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.1806-29-7, Name is 2,2-Biphenol, molecular formula is C12H10O2. In a Article£¬once mentioned of 1806-29-7, Recommanded Product: 2,2-Biphenol

Formation and reactivity of 4-oxocyclohexa-2,5-dienylidene in the photolysis of 4-chlorophenol in aqueous solution at ambient temperature

Nanosecond laser flash photolysis of an aqueous solution of 4-chlorophenol (lambdaexc = 266 nm) produces, at pulse end, a transient with absorption maxima at 384, 370, and ca. 250 nm; upon addition of an H-donor such as 2-propanol, this spectrum is converted into that of the phenoxyl radical (lambdamax = 400 and 385 nm), and in presence of O2, it is converted into a transient with a broad absorption band peaking at 460 nm. This reaction behavior can be understood by assuming formation of the carbene, 4-oxocyclohexa-2,5-dienylidene, by elimination of HCl from excited 4-chlorophenol; the pulse end transient spectrum is assigned to this species, while the 460 nm band is assigned to benzoquinone O-oxide formed by addition of O2 to the carbene. Both phenoxyl radical and benzoquinone O-oxide are produced upon photolysis of 4-chlorophenol in neat alkanols as well. On the other hand, photolysis in n-hexane yields the triplet-triplet absorption, which is absent in polar solvents, and no indication of carbene formation. It can be concluded that the primary step of 4-chlorophenol photolysis in aqueous or alcoholic solution is heterolytic C-Cl bond scission; a quantum yield of 0.75 is determined for it in neutral or acid aqueous medium upon excitation at 266 nm. Photolysis of chlorophenolate produces the same transients, but with a markedly lower yield, and, in addition, eaq- and 4-chlorophenoxyl radicals. The proposed reaction mechanism provides a straightforward explanation of the results of photoproduct analysis, published by previous authors as well as contributed in the present work. In particular, formation of p-benzoquinone in the presence of O2 can be accounted for by intermediate formation of benzoquinone O-oxide. Production of 4-oxocyclohexa-2,5-dienylidene with high yield allows, for the first time, extensive investigation of the kinetics and mechanism of the reactions of a carbene in an aqueous environment. In the present work, we have studied (a) the addition reaction with O2 on the one hand and with halides on the other; (b) H abstraction reactions with alkanols; (c) reaction with 4-chlorophenol itself; and (d) reaction with H2O. The rate constants for reaction with O2 (3.5 ¡Á 109 M-1 s-1) and with I- (4.6 ¡Á 109 M-1 s-1) are close to the diffusion-controlled limit, whereas reactions with Br- (6.8 ¡Á 107 M-1 s-1) and Cl- (<3 ¡Á 105 M-1 s-1) are slower. Rate constants for reaction with alkanols follow the pattern known for their reactions with radicals, with values ranging from 5 ¡Á 105 M-1 s-1 for tert-butyl alcohol to 1.9 ¡Á 107 M-1 s-1 for 2-butanol. All these observations are consistent with the triplet character of the carbene. A rate constant of 1.5 ¡Á 103 M-1 s-1 has been determined for reaction with H2O. This reaction is not accompanied by formation of OH radicals; it is concluded that it proceeds by insertion into the O-H bond rather than by O-H cleavage. The exceptional stability of the carbene in aqueous solution is thus mainly attributed to the high barrier for O-H rupture in the water molecule. Additionally, a specific carbene-H2O interaction is revealed by semiempirical calculations, which could contribute to energetic and orientational hindrance of the reaction. Further theoretical results support the interpretation of both spectroscopic and kinetic properties of the carbene. Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions.Recommanded Product: 2,2-Biphenol, you can also check out more blogs about1806-29-7

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Electric Literature of 1806-29-7, An article , which mentions 1806-29-7, molecular formula is C12H10O2. The compound – 2,2-Biphenol played an important role in people’s production and life.

Metal complexes of phthalocyanine structural analogs with oxygen- or nitrogen-containing heterorings. Synthesis and properties

Nucleophilic substitution of the bromine atom and nitro group in 4-bromo-5-nitrophthalodinitrile and reduction of 4-benzoylamino-5- nitrophthalodinitrile gave, respectively, tribenzo[b,e,g][1,4]dioxocine-7,8- dicarbonitrile and 2-phenylbenzimidazole-5,6-dicarbonitrile. These compounds were used to synthesize new structural analogs of phthalocyanine, having oxygen- and nitrogen-containing heterorings, (tetratribenzo[b,e,g][1,4]dioxocino[7,8-b, g,l,q]-5,10,15,20-tetraazaporphyrinato)copper(II) and (23,73,123,173- tetraphenyl-tetrabenzimidazolo[5,6-b,g,l,q]-5,10,15,20-tetraazaporphyrinato) cobalt(II). Spectral properties of the resulting complexes were studied.

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In an article, published in an article, once mentioned the application of 1806-29-7, Name is 2,2-Biphenol,molecular formula is C12H10O2, is a conventional compound. this article was the specific content is as follows.Computed Properties of C12H10O2

Epigenetic toxicity of hydroxylated biphenyls and hydroxylated polychlorinated biphenyls on normal rat liver epithelial cells

2-Biphenylol, 3-biphenylol, 2,2?-biphenyldiol, 3,3?-biphenyldiol, 3-chloro-2-biphenylol, and 4,4?-dichloro-3-biphenylol were evaluated using the scrape-loading/dye transfer (SL/ DT) technique to determine in vitro gap junctional intercellular communication (GJIC) in a normal rat liver epithelial cell line as a measure of the epigenetic toxicity. Cytotoxicity was determined using the neutral red uptake assay. A dose range of 0-300 muM was examined. Only 3,3?-biphenyldiol and 4,4?-dichloro-3-biphenylol induced cytotoxicity within the tested dose ranges. Noncytotoxic doses were selected for evaluation of epigenetic toxicity. 4,4?-Dichloro-3-biphenylol was most inhibitory to GJIC at the lowest dose. The cytotoxicity and GJIC inhibitory effects observed for 4,4?-dichloro-3-biphenylol might be, although not exclusively, a consequence of the lipophilic nature of this chemical. 3-Chloro-2-biphenylol was least inhibitory to GJIC. 3-Chloro-2-biphenylol was less inhibitory to GJIC than 2-biphenylol because of the presence of the chlorine functional group, which appears to attenuate the toxic effect of the ortho-hydroxyl group. Although cells were capable of complete recovery of GJIC after removal of each of the chemicals, only with 2,2?-biphenyldiol and 4,4,?-dichloro-3-biphenylol did the cells demonstrate partial recovery without removal of the chemical. The more noncoplanar conformation of 2,2?-biphenyldiol and 2-biphenylol might explain their more inhibitory behavior in comparison to 3,3?-biphenyldiol and 3-biphenylol, respectively.

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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.1806-29-7, Name is 2,2-Biphenol, molecular formula is C12H10O2. In a Article£¬once mentioned of 1806-29-7, COA of Formula: C12H10O2

Novel biphenol phosphoramidite ligands for the enantioselective copper-catalyzed conjugate addition of dialkyl zincs

Phosphoramidite ligands, based on a chiral amine and atropoisomerically flexible biphenols, induce high enantioselectivities (ee’s up to 98%) in the copper-catalyzed conjugate addition of dialkyl zinc reagents to a variety of Michael acceptors.

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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.1806-29-7, Name is 2,2-Biphenol, molecular formula is C12H10O2. In a Article£¬once mentioned of 1806-29-7, Computed Properties of C12H10O2

A simplified and convenient laboratory-scale preparation of 14N or 15N high molecular weight poly(dichlorophosphazene) directly from PCl5

A simple and convenient one-pot synthesis of THF solutions of high molecular weight poly(dichlorophosphazene) [NPCl2]n, or the 15N isotopomer [15NPCl2]n, starting directly from PCl5 and NH4Cl or 15NH4Cl in a solution of 1,2,4-trichlorobenzene in the presence of sulfamic acid and calcium sulfate dihydrate, is described. The solutions of [NPCl2]n in THF, which are obtained free of poly(tetrahydrofuran) by preparing them in the presence of K2CO 3, can be reacted directly with phenols, biphenols, or even HO-CH2CF3 in the presence of K2CO3 or Cs2CO3 to obtain, after a very simple workup, the corresponding polyphosphazene derivatives almost free of chlorine.

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Related Products of 1806-29-7. Let¡¯s face it, organic chemistry can seem difficult to learn. Especially from a beginner¡¯s point of view. Like 1806-29-7, Name is 2,2-Biphenol. In a document type is Article, introducing its new discovery.

Activation of Reducing Agents. Sodium Hydride Containing Complex Reducing Agents. 31. NiCRAL’s as Very Efficient Agents in Promoting Homo-Coupling of Aryl Halides

Homo-coupling of aryl bromides and chlorides is efficiently performed with nickel-containing complex reducing agents NiCRA-bpy.In a number of cases the presence of alkali iodides improves the procedure.Yields are very high and a number of functional groups are resistant.The mechanistic and catalytic aspect of these reactions are discussed.

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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. 1806-29-7, C12H10O2. A document type is Article, introducing its new discovery., Computed Properties of C12H10O2

The thermodynamic properties of dibenzofuran

Measurements leading to the calculation of the ideal-gas thermodynamic properties for dibenzofuran are reported.Experimental methods included combustion calorimetry, adiabatic heat-capacity calorimetry, comparative, ebulliometry, inclined-piston manometry, and differential scanning calorimetry.Entropies, enthalpies, and Gibbs energies of formation were derived for the ideal gas for selected temperatures between 298.15 K and 720 K.The critical temperature and critical density were determined with a differential scanning calorimeter, and the critical pressure was derived.These are the first reported experimental critical properties for dibenzofuran.Measured combustion enthalpies, vapour pressures, critical properties, and ideal-gas entropies are compared with literature values.

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