Copolymerization cycloalkenes

Copolymerization of ethylene with a cycloalkene, especially a bulky one such as norhor-nene, yields an alternating copolymer if the comonomer feed is rich in the cycloalkene [Wendt et al., 2002],... 

Acetylenes copolymerize with each other and with cycloalkenes under the influence of olefin metathesis catalysts. With non-living systems it is possible to make statistical... 

Alternating polymers can be produced by taking advantage of the functional group tolerance, high activity, and chemoselectivity of 3. Copolymerization of cycloalkenes such as cyclooctene or cyclopentene with diacrylates affords regular alternating polymers (Eq. 15) [32]. Based on the different reactivity of the two monomers (class 1 and class 2, respectively) the more... 

Metathesis catalysts with one chiral A-substituent (e.g., 17) are useful for ROMP. In alternating copolymerization of norbomene with other cycloalkenes the steric interactions of the growing polymer chain dictate selectivity. 

Most V-based catalysts of the Ziegler-Natta type cause double-bond opening (addition polymerization) rather than ROMP of cycloalkenes. For example, V(acac)3/Et2AlCl causes only Ziegler-Natta-type addition polymerization of cyclobutene (Natta 1963) and its copolymerization with ethene (Natta 1962). 

Table 10.7 Metathesis copolymerization of acetylenes with cycloalkenes...

The copolymerization of various pairs of cycloalkenes can be carried out in the presence of ROMP catalytic systems. The structures obtained are predominantly statistical because the differences in ring size or ring substituents, which will always exist, ensure that the reactivities of the monomers are sufficiendy dissimilar to make uniform alternating copolymers virtually impossible to prepare. 

All rubbers produced by the polymerization or copolymerization of dienes or cycloalkenes can be classified as diene rubbers. All diene rubbers have main-chain carbon-carbon double bonds, as can be seen from their monomeric units ... 

W. Kaminsky, R. Spiehl, Copolymerization of cycloalkenes with ethylene in presence of chiral zirctmocene catalysts, Makromol. Chem., 190, 515-526 (1989)... 

FIGURE 24.3 Chiral zinc catalyst 14 for the asymmetric, alternating copolymerization of cycloalkene oxides and CO2. 

Cheng, M. Darling, N. A. Lobkovsky, E. B. Coates, G W. Enantiomerically-enriched organic reagents via polymer synthesis Enantioselective copolymerization of cycloalkene oxides and CO2 using homogeneous, zinc-based catalysts. Chem. Commun. 2000, 2007-2008. 

NaF-AljOs yields 2-(trifluorovinyl)pyridine, which can be copolymerized with tetrafluoroethylene to yield a material possessing good receptivity towards dyes and pigments. Eliminations also feature in studies concerned with pyrolyses of the alkanes CHFj-CHFj (—HF shock tube), MeCF, (—HF shock tube, - flow over hot AIF3, FeFj, or MgFj ), MeCHF (—HF shock tube, static ), CH F CHaF (—HF flow over hot C dosed with activators), CHjF-CHjCl -HF, — HCl shock tube and static ), and CFj-CHjCI (—HF, —HCl shock tube), the synthesis of 1-fluoro-cycloalkenes (Scheme 8), a comparison of KOH dehydrofluorinations of... 

Finally, copolymers containing polyethylene backbone and polystyryl grafts, (124), have been manufactured by ring-opening metathesis copolymerization of cycloalkenes like cyclooctene with co-norbornenyl macromonomers in the presence of the molybdenum carbene initiator Mo(NAr)(CHrBu)(OC(CH3)(CF3)2)2 [92] [Eq. (56)]. 

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