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Il Kim,Vinukrishnan Appukuttan,Jin Hyuk Kim,Chang Sik Ha 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.3
Effects of structural variations of the diimine ligand on catalyst activities for vinyl polymerization of norbornene (NB) have been investigated by a series of Ni(II) α-diimine catalysts of the general formula: [{ArN=C(Ac)- C(Ac)=NAr}]NiBr2 (Ac=acenaphthyl) (Cat(H), Ar=C6H5; Cat(2,6-Me), Ar=2,6-C6H3Me2; Cat(2,6-Et), Ar=2,6-C6H3Et2; Cat(2,6-iPr), Ar=2,6-C6H3 i-Pr2; Cat(2,3-Me), Ar=2,3-C6H3Me2; Cat(2,4-Me), Ar=2,4-C6H3Me2; Cat(2,5-Me), Ar= 2,5-C6H3Me2; Cat(3,5-Me), Ar=3,5-C6H3Me2; Cat(2,4,6-Me), Ar=2,4,6-C6H2Me3). In situ reactions with methylaluminoxane generated the active catalysts, and they showed good activity towards NB polymerizations. As indicated by relatively higher activities of Cat(H) and Cat(3,5-Me), it can be generalized that catalysts having 2,6-substituents are less active due to steric interaction between monomer and substituents. In addition, electron donating methyl groups at 2-, 4- or 6-position on the N-aryl have a con effect and that at 3,5-position has a pro effect.
Bijal Kottukkal Bahuleyan,안인용,Vinukrishnan Appukuttan,이소현,하창식,김일,서홍석 한국고분자학회 2010 Macromolecular Research Vol.18 No.7
A series of tridentate cobalt complexes of the general formula [RN(CH2)2N]=An=[N(2,6-C6H3iPr)](R=Me, Et, iPr; An=acenaphthenequinone) have been synthesized. All complexes were active towards ethylene oligomerization,showing activities exceeding 104 g-oligomer/mol-Co·h·bar in the presence of a methylaluminoxane co-catalyst. 1-Butene and trans-2-hexene were the major oligomer fractions obtained.