Category: 3229-00-3

Application In Synthesis of Pentaerythrityltetrabromide. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: Pentaerythrityltetrabromide, is researched, Molecular C5H8Br4, CAS is 3229-00-3, about Synthesis and X-ray crystal structure of a bridging trispiran ligand. Author is Steel, Peter J.; Sumby, Christopher J..

Spiro[3,3]heptane-2,6-dispiro-4,5-diazafluorene has been synthesized in three steps from 1,10-phenanthroline. It crystallizes in the orthorhombic space group P212121 and has the two 4,5-diazafluorene metal binding domains mutually orthogonal.

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Imidazole – Wikipedia,
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Computed Properties of C5H8Br4. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: Pentaerythrityltetrabromide, is researched, Molecular C5H8Br4, CAS is 3229-00-3, about Eutectic crystallization of poly(L-lactic acid) and pentaerythrityl tetrabromide. Author is Vasanthakumari, R..

The influence of the viscosity average mol. weight (M̅v) of the polymer on the eutectic crystallization of poly(L-lactic acid) (I) [26811-96-1] and pentaerithritol tetrabromide (II) [3229-00-3] was studied. The eutectic composition was greatly affected by the mol. weight of the polymer, whereas the eutectic temperature remained unaffected. As M̅v increased, the composition of I in the eutectic decreased. Isothermal crystallization tests at 388-403 K indicated that a 2-stage crystallization occurs. Simultaneous crystallization of I and the diluent II proceeded in such a way that II rods were the initiating phase.

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Safety of Pentaerythrityltetrabromide. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: Pentaerythrityltetrabromide, is researched, Molecular C5H8Br4, CAS is 3229-00-3, about Spirans. X. 2,2′,3,3′-Tetrahydro-3,3′-spirobis[4H-[1,5]benzooxathiepin] and 2,3,4,5-tetrahydrospiro[1H-benzo[f][1,5]diazepine-3,1′-cyclopropane]. Rapid equilibrium between diastereoisomeric forms. Author is Smolinski, S.; Kubaszek, M.; Nagraba, K..

NMR showed that the 2 heterocyclic rings of the spiran I, prepared in 2% yield from o-HSC6H4OH di-Na salt and C(CH2Br)4, were in the chair form. I was represented by 3 topologically equivalent diastereoisomeric structures. Two structures possessed C2-sym. and one C1-sym. o-(H2N)2C6H4 and C(CH2Br)4 in the presence of Cu-bronze gave 1.3% spiran II whose heterocyclic ring was in the chair form.

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So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Lothian-Tomalia, Mary K.; Hedstrand, David M.; Tomalia, Donald A.; Padias, Anne Buyle; Hall, H. K. Jr. researched the compound: Pentaerythrityltetrabromide( cas:3229-00-3 ).Category: imidazoles-derivatives.They published the article 《A contemporary survey of covalent connectivity and complexity. The divergent synthesis of poly(thioether) dendrimers. Amplified, genealogically directed synthesis leading to the de Gennes dense packed state》 about this compound( cas:3229-00-3 ) in Tetrahedron. Keywords: review divergent synthesis polythioether dendrimer; amplified genealog directed preparation dendrimer review; packed state de Genne dendrimer review; connectivity complexity dendrimer synthesis review. We’ll tell you more about this compound (cas:3229-00-3).

A review with 19 references on preparation of a poly(thioether) dendrimer (d-PTE) family using preformed branch cells in a genealogically directed synthesis (GDS) strategy with covalent bond amplification. Bicyclic orthoester functionality is introduced into a branch cell reagent (BCR) to temporarily mask pentaerythritol derived branch cells which are used to construct the interior of this new dendrimer family. These BCRs with multiplicities = 3 (Nb=3), are organized and amplified around an initiator core with multiplicity = 4 (Nc=4). The initiator core, pentaerythritol tetrabromide (Nc=4), is allowed to react with four equivalent of 4-acetothiomethyl-2,6,7-trioxabicyclo[2.2.2]octane (Nb=3) in the presence of base, to form the first generation possessing four bicyclic orthoester groups. After deprotection and transformation to bromide surface groups via tosylate intermediates, the second generation possessing twelve bicyclic orthoester groups is formed. Surprisingly, attempted displacement of all 36 surface groups at the third generation level showed that only one third of the end groups could be substituted. These exptl. data suggest that this (Nc=4, Nb=3) type dendrimer family exhibits de Gennes dense packing properties at the third generation level. Elemental anal., FTIR, H/C13 NMR spectroscopy and mass spectroscopy were used to confirm the structures. Mol. simulation data suggest that this dendrimer family should not undergo de Gennes dense-packing until the fourth generation. Steric requirements of the bulky mercaptomethyl anion used in the SN2 packing until the fourth generation. Steric requirement of the bulky mercaptomethyl anion used in the SN2 displacement of terminal bromides on this congested surface are proposed as the reason for incomplete formation of the third generation. This observation illustrates another example of “”sterically induced stoichiometry”” (SIS).

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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Reduction of pentaerythrityl tetrabromide in ethanol with zinc. Isolation of spiropentane》. Authors are Slabey, Vernon A..The article about the compound:Pentaerythrityltetrabromidecas:3229-00-3,SMILESS:BrCC(CBr)(CBr)CBr).Application of 3229-00-3. Through the article, more information about this compound (cas:3229-00-3) is conveyed.

Pentaerythrityl tetrabromide (1940 g.), added in small portions (4 hrs.) to a refluxing mixture of 2500 ml. EtOH, 875 ml. H2O, 1300 g. Zn dust, 530 g. Na2CO3, and 125 g. NaI, the mixture boiled an addnl. hr., and the distillate fractionated through a 22-mm. glass column, 7 ft. in length, packed with 3/32-in. single-turn glass helices (rated as 100 theoretical plates at total reflux), gives 78-89% of a mixture containing 56% of methylenecyclobutane (I), f.p. -134.68°, b760 42.22°, nD20 1.42087, d420 0.7401; 26% of spiropentane (II), f.p. -107.05°, b760 39.03°, nD20 1.41220, d420 0.7551; 15% of 2-methyl-1-butene (III), f.p. -137.50°, b760 31.12°, nD20 1.37781, d420 0.6504; and 1-3% of dimethylcyclopropane. The method of Murray and Stevenson (use of molten AcNH2, C.A. 38, 1476.9, 3615.1) gave a total hydrocarbon yield of only 37-8% (36-10% I, 47-60% II, and 17-30% III).

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Imidazole – Wikipedia,
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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《X-ray crystallographic and electron-interferometric determination of the molecular structure of the halides C(CH2X)4; (X = Cl, Br, I)》. Authors are Hassel, O.; Stromme, L. C..The article about the compound:Pentaerythrityltetrabromidecas:3229-00-3,SMILESS:BrCC(CBr)(CBr)CBr).SDS of cas: 3229-00-3. Through the article, more information about this compound (cas:3229-00-3) is conveyed.

The conclusions of Wagner and Dengel (cf. C. A. 26, 3418) on the structure of these compounds are erroneous because the elementary cell found by them is too small. The electron-diffraction experiments of de Laszlo (cf. C. A. 28, 5671.4) are not in agreement with the results of H. and S. The structure of the compounds appears to be very complicated.

From this literature《X-ray crystallographic and electron-interferometric determination of the molecular structure of the halides C(CH2X)4; (X = Cl, Br, I)》,we know some information about this compound(3229-00-3)SDS of cas: 3229-00-3, but this is not all information, there are many literatures related to this compound(3229-00-3).

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Imidazole – Wikipedia,
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COA of Formula: 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 Fabrication and Spatially Resolved Functionalization of 3D Microstructures via Multiphoton-Induced Diels-Alder Chemistry. Author is Quick, Alexander S.; Rothfuss, Hannah; Welle, Alexander; Richter, Benjamin; Fischer, Joachim; Wegener, Martin; Barner-Kowollik, Christopher.

Three-dimensional microstructures are fabricated utilizing direct laser writing combined with a non-radical step polymerization based on multiphoton-induced Diels-Alder chem. of o-quinodimethanes and maleimides. Woodpile photonic crystals with a total of five axial periods and a rod spacing of down to 500 nm are fabricated. The structures are characterized via SEM and focused ion beam milling. In addition, corresponding photonic stop bands are investigated via light microscopy as well as transmission and reflection spectroscopy. The Diels-Alder based network formation during direct laser writing is verified via IR spectroscopy. Spatially resolved surface patterning of covalently bonded functional mols. on fabricated structures is demonstrated by employing the direct laser writing setup and a bromine containing maleimide. The successful surface modification is verified via time-of-flight secondary ion mass spectrometry.

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Imidazole – Wikipedia,
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So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Wan, Yongqin; Mitkin, Oleg; Barnhurst, Loren; Kurchan, Alexei; Kutateladze, Andrei researched the compound: Pentaerythrityltetrabromide( cas:3229-00-3 ).Application In Synthesis of Pentaerythrityltetrabromide.They published the article 《Molecular Assembly and Disassembly: Novel Photolabile Molecular Hosts》 about this compound( cas:3229-00-3 ) in Organic Letters. Keywords: photolabile mol host; photofragmentation spirodithiane formyl calixarene benzo crown ether host. We’ll tell you more about this compound (cas:3229-00-3).

A new approach to the assembly and photochem. disassembly of mol. hosts is developed. It is based on photoinduced fragmentation in hydroxyalkyl dithianes and utilizes a novel spiro-bis-dithiane as a photolabile mol. tether to link two formylated macromol. blocks, e.g., formyl calixarenes or formyl dibenzocrown ethers. A key feature of this mol. system is that after an assembly-disassembly cycle the starting macromol. blocks are recovered intact and can be used again.

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Reference:
Imidazole – Wikipedia,
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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: Pentaerythrityltetrabromide, is researched, Molecular C5H8Br4, CAS is 3229-00-3, about Synthesis and crystal structures of a 1D Cu coordination polymer based on tetrakis [3-(carboxyphenyl)oxomethyl] methane acid, the main research direction is coordination polymer copper carboxyphenyloxomethylmethane pyridine complex solvothermal preparation; crystal structure coordination polymer copper carboxyphenyloxomethylmethane pyridine complex; cyclic voltammetry coordination polymer copper carboxyphenyloxomethylmethane pyridine complex; thermal stability coordination polymer copper carboxyphenyloxomethylmethane pyridine complex.Safety of Pentaerythrityltetrabromide.

A semi-rigid tetrahedral linker tetrakis[3-(carboxyphenyl)oxomethyl] methane acid (H4L) and its coordination polymer [Cu(H2L)(Py)2]n (Py = pyridine) were synthesized and characterized by elemental analyses, IR spectroscopy, etc. The single crystal structure show the title complex crystallizes in the monoclinic system with space group C2/c, a 1.9430(7) nm, b 0.9264(3) nm, c 2.7849(9) nm, β 96.763(3)°, Z = 4, F(000) = 1724. In the complex each Cu(II) atoms is coordinated with two pyridine and two oxygen atom from two arms of H2L2-, and displays a one-dimensional line topol. with the other two arms free. Platon calculation show that the guest accessible volume (1.397 nm3 per unit cell) comprises 28.1% of the unit cell volume The thermal anal. shows the title compound is stable up to 236.9°.

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Reference of Pentaerythrityltetrabromide. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: Pentaerythrityltetrabromide, is researched, Molecular C5H8Br4, CAS is 3229-00-3, about Electroreduction of tetrabromoneopentane and 1,1-bisbromomethylcyclopropane.

The electrochem. reduction was studied of tetrabromoneopentane [3229-00-3] in anhydrous DMF (H2O ∼0.01%) in LiClO4 and Me4NBr supporting electrocytes on a Hg cathode. The electrochem. cyclization of the 1,3-dibromides in cyclopropane occurs with the intermediate participation of 3-bromopropyl anions.

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Imidazole – Wikipedia,
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