The unique combination of the cations and anions give

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Unformatted text preview: and commercial applications such as absorption media for gas separations, solvents for reactions, heat transfer fluids, separating agent in extractive distillation, for processing biomass, as the working fluid in a variety of electrochemical applications (batteries, capacitors, solar cells, etc.), as lubricants and in biocatalysts. Can ILs be fit to be called a green solvent? ILs as alternative solvents for organic transformations has been extensively investigated. ILs are safer solvents compared to standard organic solvents because they are non-flammable, have no vapour pressure and can be reused. To answer whether ILs meets green qualities, we will look into aspects whether they adhere to the twelve principles of green chemistry. 62 3rd ICYC 2010 Universiti Sains Malaysia KN-25 23rd-25th June 2010 PD-CATALYZED CONTROLLED SYNTHESIS OF POLYOLEFINS WITH NOVEL STRUCTURES AND THEIR PROPERTIES Daisuke Takeuchi Chemical Resources Laboratory, Tokyo Institute of Technology 4259 Nagatsuta, Yokohama 226-8503, Japan E-mail: [email protected] Conventional transition-metal-catalyzed copolymerization of ethylene with an olefin monomer produces polyethylene having the substituents due to the olefin monomer, distributed randomly along the polymer main chain. It has been difficult to control the sequence of these monomers in the copolymer. Herein we report Pd-catalyzed polymerization of 1,6-heptadienes and cyclopentenes having various alkyl groups, which produces the polymer with cyclic repeating units located in controlled intervals along the main chain. N Me N Pd Cl 1 N Me N Pd Cl 2 Pd diimine complex (1) and NaBARF (BARF = B{C6H3(CF3)2-3,5}4) initiates the cyclopolymerization of allyl(2-butenyl)malonate (I-1) in CH2Cl2 at room temperature to produce the polymer having trans-1,2disubstituted cyclopentane rings. The polymerization of 1,6-dienes with longer polymethylene chain and various substituents also proceeds to afford the polymers with trans-fused cyclopentane rings and the linear polymethylene chain. H (CH2)n Pd Complex O O O O O O O O n = 0 - 10 (CH2)n m I-n (n = 0 - 10) (CH2)n II-n (n = 1 - 10) Pd Complex H (CH2)n m n = 1 - 10 Pd diimine complex (1) also promot...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.

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