Category: 3229-00-3

Safety of Pentaerythrityltetrabromide. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: Pentaerythrityltetrabromide, is researched, Molecular C5H8Br4, CAS is 3229-00-3, about Directed synthesis of spiropentane from tetrabromoneopentane. Author is D’yachenko, A. I.; Protasova, E. L.; Nefedov, O. M..

Reaction of C(CH2Br)4 (I) with Zn in 3-10% alcs. KOH at 80° for 30 min gave 70-80% mixture containing 90% II; 1,1-dimethylcyclopropane, CH2:CMeCH2Me and a small amount of III were also obtained. Treatment of I with Na, Li or Mg gave II or III, the ratio of which depended on the type of metal.

There is still a lot of research devoted to this compound(SMILES：BrCC(CBr)(CBr)CBr)Safety of Pentaerythrityltetrabromide, and with the development of science, more effects of this compound(3229-00-3) can be discovered.

Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

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: Pentaerythrityltetrabromide, is researched, Molecular C5H8Br4, CAS is 3229-00-3, about Synthesis and structure of tetrakis[(diphenylphosphino)methyl]methane and its tetranuclear gold chloride complex.Reference of Pentaerythrityltetrabromide.

Tetrakis(diphenylphosphinomethyl)methane, C(CH2PPh2)4, was prepared following modified literature methods, its structure determined by x-ray diffraction methods, and its 1H and 13C NMR and mass spectra compiled. The tetranuclear gold(I) complex C[CH2PPh2·AuCl]4 was obtained by treatment of the tetrafunctional ligand with four equivalent of (Me2S)AuCl, and its structure was also determined The changes in structure and conformation as compared to that of the free ligand provide evidence for attractive intramol. Au···Au interactions for one pair of gold(I) centers. Owing to steric congestion of the mol., the remainder pair are independent structural units not engaged in metal-metal interactions.

There is still a lot of research devoted to this compound(SMILES：BrCC(CBr)(CBr)CBr)Reference of Pentaerythrityltetrabromide, and with the development of science, more effects of this compound(3229-00-3) can be discovered.

Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem

Safety of Pentaerythrityltetrabromide. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: Pentaerythrityltetrabromide, is researched, Molecular C5H8Br4, CAS is 3229-00-3, about Synthesis and structure characterization of 1,3-dibromo-2,2-bis(bromomethyl)propane. Author is Peng, Yong-li; Luo, Can; Chen, Bai-guang.

To solve the problems of complicated production process conditions and low production rate of 1,3-dibromo-2,2-bis(bromomethyl)propane, pentaerythritol, benzenesulfonyl chloride and sodium bromide were applied as raw materials to prepare pentaerythrityl bromide through two-step method. The optimum preparation technol. of pentaerythritol bromide was studied by orthogonal experiment of four factors and three levels, the optimum process parameters were reaction time of 12 h, reaction temperature of 150°C, catalyst of 5%, feed ratio of 1 : 6.2, and the yield of pentaerythritol bromide reached to 90.85%. IR spectrum showed that the hydroxyl characteristic peak disappeared entirely, and bromine-carbon bond was generated. Hydrogen NMR figure showed that the methylene protons unimodal appeared on 3.59. As a result, the production rate increased significantly by this way, and the product was pure without byproducts and could be used directly. It had important significance for the com. process of 1,3-dibromo-2,2-bis(bromomethyl)propane.

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Reference:
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 《Cyclobutanone》. Authors are Conia, Jean Marie; Leriverend, Pierre; Ripoll, Jean Louis.The article about the compound:Pentaerythrityltetrabromidecas:3229-00-3,SMILESS:BrCC(CBr)(CBr)CBr).Reference of Pentaerythrityltetrabromide. Through the article, more information about this compound (cas:3229-00-3) is conveyed.

A procedure for the economical preparation of cyclobutanone (I) from pentaerythritol (II) was worked out. A mixture of 700 g. II, 1300 g. 62% HBr, 700 g. 48% HBr and 600 g. AcOH was refluxed 15 hrs. and then distilled to give 1300 g. pentaerythritol tribromide (III), b12 170-80°, m. 90-5°. To 1400 g. III heated to 180° and stirred was slowly added 600 g. PBr3, the temperature not to exceed 200°. After 15 hrs. at 180°, the mixture was cooled and poured into 3 l. H2O to give 1400 g. pentaerythritol tetrabromide (IV), m. 155° (EtOH). Methylenecyclobutane (V) was prepared from IV in 60-85% yield by the method of Shand, et al. (CA 38, 26342). Ozone was passed (100 l./hr.) for about 7 hrs. through a mixture of 30 g. V, 15 g. pyridine, and 200 ml. CH2Cl2 cooled to -80°. The unreacted ozone was swept out by O and the cooling bath withdrawn. When the temperature of the stirred solution reached -20°, an exothermic reaction set in. By cooling again the temperature was kept below 0°, then brought up to room temperature overnight. The solution was decanted from some brown tar, 10 ml. concentrated HCl added, the mixture stirred 2 hrs. and the upper aqueous layer removed. The organic layer was dried with CaCl2 and fractionated to yield 22 g. I, b. 97-100°, n21D 1.4205; 2,4-dinitrophenylhydrazone m. 144-5°.

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Reference:
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 phase transition in pentaerythritol. III》. Authors are Nitta, Isamu; Wantanabe, Tokunosuke; Seki, Shuzo; Momotani, Masanobu.The article about the compound:Pentaerythrityltetrabromidecas:3229-00-3,SMILESS:BrCC(CBr)(CBr)CBr).Recommanded Product: Pentaerythrityltetrabromide. Through the article, more information about this compound (cas:3229-00-3) is conveyed.

In the light of the exptl. information obtained from the thermal measurements and the expansion coefficients on pentaerythritol, the transition mechanism from a tetragonal to a cubic lattice is discussed. Comparison of the large entropy, 22.8 e.u., for the polymorphic transition, with the entropy of fusion 12.7 e.u., and 25.3 e.u. for tetra-bromopentaerythritol and meso-erythritol, resp. (where, in the latter case, H bonding plays an important role), suggests a difference in degree of H bonding between the tetragonal and cubic forms of pentaerythritol. From the above information and the entropy of fusion of 3.2 e.u. for pentaerythritol, a value of 13.3 e.u. is obtained for this effect. Estimation of the difference in the configurational entropy between these 2 forms to be 14.47 e.u. from statistical considerations, gives close agreement with the exptl. results.

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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: 3229-00-3, is researched, Molecular C5H8Br4, about The molecular structure, conformations and vibrational spectra of 2,2-di(chloromethyl)-1,3-dichloropropane and 2,2-di(bromomethyl)-1,3-dibromopropane, the main research direction is IR Raman dihalomethyldihalopropane; crystal structure dihalomethyldihalopropane; geometry dihalomethyldihalopropane; conformation dihalomethyldihalopropane; mol vibration dihalomethyldihalopropane.Quality Control of Pentaerythrityltetrabromide.

The IR and Raman spectra of (ClCH2)4C and (BrCH2)4C were recorded as melts and as solutes in various solvents. Crystal structures were determined In the crystalline state both compounds exist in the D2d conformer, whereas in the melt and in solution an addnl. conformer, probably of symmetry S4 was assigned supported by force constant calculations

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Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem