Effect of substituents on addition polymerization of norbornene derivatives with two Me3Si-groups using Ni(II)/MAO catalystстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 19 апреля 2017 г.
Аннотация:Addition polymerization and copolymerization of bis(Me3Si)-substituted norbornene-type
monomers such as 5,5-bis(trimethylsilyl)norbornene-2, 2,3-bis(trimethylsilyl)norbornadiene-
2,5 and 3,4-bis(trimethylsilyl)tricyclo[4.2.1.02,5]nonene-7, in the presence of Ni(II)
naphtenate/MAO catalyst were studied. Disubstituted norbornene and norbornadiene were found
to be practically inactive in homopolymerization. On the other hand, their copolymerization with norbornene proceeded withmoderate yields of copolymers containing predominantly norbornene units. Under studied reaction conditions 2,3-bis(trimethylsilyl) norbornadiene-2,5 was transformed into the only exo-trans-exo-dimer as a result of the [2+2]-cyclodimerization reaction. Moving Me3Si-substituents one carbon atom away from norbornene double bond made 3,4-bis(trimethylsilyl)tricyclo[4.2.1.02,5]nonene-7 active in homopolymerization and allowed to obtain addition homo-polymer with twoMe3Si-substituents in each elementary unit. The reaction mechanism and steric effect of Me3Si-substituents are also discussed.