β Scribed by Dario Liguori; Fabia Grisi; Irene Sessa; Adolfo Zambelli
No coin nor oath required. For personal study only.
This paper reports the predominantly syndiotacticβspecific polymerization of propylene in the presence of titanium monoamidinate/methylaluminoxane (MAO) catalysts. The same catalysts, depending on the reaction conditions, also promote either predominantly 1,4βcis or 1,4βtrans polymerization of 1,3βbutadiene and polymerization of styrene either to highly syndiotactic or to stereoirregular polymer. Some preliminary information about the features of propylene polyinsertion is also reported.
Expansion of the 20β24 ppm region of the ^13^C NMR spectrum of sample 2. The starred resonance at 21.75 ppm and the shoulders are not assigned.
magnified imageExpansion of the 20β24 ppm region of the ^13^C NMR spectrum of sample 2. The starred resonance at 21.75 ppm and the shoulders are not assigned.
π SIMILAR VOLUMES
1 -Vinylcyclohexene was polymerized in the presence of several homogeneous catalytic systems consisting of methylaluminoxane and group 4 metallocenes such as CpTiC13, [isopropyl(cyclopentadienyl)( 1fluorenyl)]ZrC12,rac-[ethylenebis( 1 -indenyl)] ZrC12, (CH3)2Si(Cp)2ZrC12, CpZrC13. The structure of t