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Influence of type and positioning of N-aryl substituents on vinyl polymerization of norbornene by Ni(II) α-diimine complexes

  • Catalysis, Reaction Engineering, Industrial Chemistry
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Abstract

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- i Pr), 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.

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Authors and Affiliations

  1. Department of Polymer Science and Engineering, Pusan National University, Busan, 609-735, Korea

    Vinukrishnan Appukuttan, Jin Hyuk Kim, Chang Sik Ha & Il Kim

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  1. Vinukrishnan Appukuttan
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  2. Jin Hyuk Kim
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  3. Chang Sik Ha
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  4. Il Kim
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Correspondence to Il Kim.

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This paper was presented at the 11th Korea-Japan Symposium on Catatysis held at Seoul, Korea, May 21–24, 2007.

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Appukuttan, V., Kim, J.H., Ha, C.S. et al. Influence of type and positioning of N-aryl substituents on vinyl polymerization of norbornene by Ni(II) α-diimine complexes. Korean J. Chem. Eng. 25, 423–425 (2008). https://doi.org/10.1007/s11814-008-0071-9

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  • DOI: https://doi.org/10.1007/s11814-008-0071-9

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