Peroxide‐induced polymerization of norbornene

Gaylord, Norman G.; Mandal, Broja M.; Martan, Michael

doi:10.1002/pol.1976.130140908

Cited by 83 publications

(31 citation statements)

References 8 publications

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“…Also, the high molecular weights of polynorbornene (from 10 5 to 10 6 g mol −1 ) are not typical of cationic or radical polymerization, which usually exhibit low molecular weights and low yields because of rearrangement and chain transfer reactions. 36,38 We can conclude that the norbornene polymerization with these catalytic systems occurs via a vinyl addition coordination mechanism.…”

Section: Mechanistic Considerationmentioning

confidence: 97%

Vinyl polymerization of norbornene by nickel(II) complexes bearing β‐diketiminate ligands

Gao

2007

Applied Organom Chemis

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Norbornene polymerizations were carried out using nickel(II) bromide complexes CH{C(R)NAr} 2 NiBr (1, R = CH 3 , Ar = 2, 6− i Pr 2 C 6 H 3 ; 2, R = CH 3 , Ar = 2, 6-Me 2 C 6 H 3 ; 3, R = CF 3 , Ar = 2, 6− i Pr 2 C 6 H 3 ; 4, R = CF 3 , Ar = 2, 6-Me 2 C 6 H 3 ) in the presence of methylaluminoxane. Compound 3 is the most active norbornene polymerization catalyst of all the nickel complexes tested. The activity of theses catalysts increases with increases in steric bulk of the substituents on the aryl rings. The electronic nature of the ligand backbone also affects the activity. The resulting polynorbornenes are vinyl type by IR and NMR analyses.

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Section: Mechanistic Considerationmentioning

confidence: 97%

Vinyl polymerization of norbornene by nickel(II) complexes bearing β‐diketiminate ligands

Gao

2007

Applied Organom Chemis

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“…The two imino C¼ ¼N bonds have distinctive double-bond character because two CAN distances are1.291(11) and 1.297(11) Å . The N(2)-Ni(1)-N(3) angle is 149.1 (3) . Two N (1)-Ni(1)-Cl angles are unsymmetrical: one is 154.9 (2) , whereas another one is 91.5 (2) ( Table II).…”

Section: Syntheses and Structures Of Complexesmentioning

confidence: 98%

“…The product was a red-brown powder with a yield of 85%. The red-brown needle crystal of complex 3 was obtained from the solution containing solvent CH 3 …”

Section: Synthesis Of Compound 26-diacetylpyridinebisanil (L1)mentioning

confidence: 99%

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Vinyl polymerization of norbornene with bis(imino)pyridyl nickel(II) complexes

Huang

Chen

Chi

et al. 2009

J of Applied Polymer Sci

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A series of different steric hindrance nickel(II) complexes 1-6 bearing 2,6-bis(imino)pyridine ligands have been synthesized and characterized. The molecular structures of the complexes 3-5 were determined by X-ray diffraction analysis. The coordination geometry around the nickel center of the complexes is either square pyramid for complexes 3 and 4 or trigonal bipyramid for complex 5. All of the nickel complexes exhibit high catalytic activity for norbornene polymerization in the presence of MAO, although low activity for ethylene oligomerization and polymerization. The effects of the Al/Ni ratio, halogen, monomer concentration, temperature, and reaction time on activity of catalyst for norbornene polymerization and polymer microstructure were investigated.

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“…[29,30] Transition metal catalysts based on Ti, Zr, Hf, V, Nb, Ta Mo, W, Re, Ru, Os, Ir, in high oxidation states lead to ring-opened metathesis polynorbornene (ROMP) via a carbene-type mechanism. Whereas transition metals in low oxidation states lead to the formation of vinylic polymerized norbornene, which is amorphous and thus soluble in solvents like chlorobenzene, 1,2-dichlorobenzene, 1,2-dichloroethane, cyclohexane, and decahydronaphthalene if Pd-, [17, 31 -40] Ni-, [41 -43] or Co-catalysts [44,45] are used.…”

Section: Polymerization Of Norbornenementioning

confidence: 99%