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  • 1
    Electronic Resource
    Electronic Resource
    Effect of some structural features of the polymer support on synthesizing 2,4,6-tribromophenyl benzyl ether in a triphase catalysis (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 34 (1994), S. 187-195 
    Details
    ISSN: 0959-8103
    Keywords: Triphase catalysis ; synthesis of 2,4,6-tribromophenyl benzyl ether ; structural features of polymer support ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The substitution reaction of benzyl bromide and 2,4,6-tribromophenol in an organic solvent/alkaline aqueous solution of KOH by triphase catalysis in which tributylamine was immobilized on a polymer support was investigated. Our main purpose was to evaluate the effect of some structural features of the polymer-supported pellet on the conversion of the organic-phase reactant (benzyl bromide). The polymer-supported pellet was obtained from copolymerization of styrene and chloromethylstyrene monomers. The reaction was identified as occurring both on the surface and within the particles of the polymer support when using a highly polar solvent. The effects of the structural features of the polymer support, which are related to the degree of cross-linking, ring substitution, lipophilicity of the polymer pellet, the chloride density and the solvents, on the conversion of benzyl bromide were investigated in detail. The experimental results indicate that 2% of cross-linking with 10% ring substitution of the macroporous polymer support provides a rapid reaction and high conversion of benzyl bromide reactant.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pi.1994.210340210
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  • 2
    Electronic Resource
    Electronic Resource
    Homogeneous reaction of carbon disulfide and o-phenylene diamine catalyzed by tertiary amines (1996)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 28 (1996), S. 885-892 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of 2-mercaptobenzimidazole (MBI) was carried out by reacting o-phenylene diamine and carbon disulfide catalyzed by tertiary amine (R3N) in a homogeneous solution. Dichloromethane, chlorobenzene, chloroform, toluene, and benzene were employed as the organic solvent. The advantage of using such organic solvents is that MBI precipitates from the organic solution. Only mechanical separation processes, such as filtration and centrifugation, can be used to obtain the MBI product of high purity. Based on the reaction mechanism, a kinetic model, which included two steps of reactions in the organic phase, was proposed, i.e.: (i) a chemical equilibrium of the reaction of CS2 and R3N to produce an active intermediate (R3N(SINGLEBOND)CS2) was built up within a short period of time and (ii) this active intermediate further reacted with o-phenylene diamine to produce the desired MBI product. A combination of the zeroth order and pseudo-first-order rates law was used to describe the kinetic data. However, the reaction follows pseudo-first-order rate law at higher temperature, and the reaction follows zeroth-order rate law at lower temperature. The effects of the operating conditions on the conversion of o-phenylene diamine were also investigated. © 1996 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.4
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