5 )[C(NiPr) 2 (CMe) 2 ] (1Π). Crystals of 1Π were isolated but this new compound undergoes a partial were synthesized from (CpΠ 2 SmCl) 2 and from the magnesium derivative [Me 4 C 2 (C 5 H 4 ) 2 ]SmCl β’ MgCl 2 (THF) 4 (4). The ansa rearrangement into a tris-CpΠ species in solution. Similar behaviour
Stereospecific polymerization of isoprene by monometallic nickel catalysts
β Scribed by Durand, J. P. ;Dawans, F.
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1970
- Tongue
- English
- Weight
- 227 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0449-2986
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π SIMILAR VOLUMES
## Abstract Titanates are versatile in the 1,4 polymerization of isoprene. The (Rβ²O)~4~Ti/RAlCl~2~ catalyst gives either __cis__β or __trans__β1,4βpolyisoprene, depending on the nature of both the titanate and the solvent. Primary titanates give __cis__β1,4βpolyisoprene in both aliphatic and aromat
## Abstract Summary: The neodymium trisborohydride Nd(BH~4~)~3~(THF)~3~ (THFβ=βtetrahydrofuran) has been used as a catalyst precursor for isoprene polymerization for the first time. Associated to an excess of Al(Et)~3~, the resulting catalyst is moderately active, giving a mixture of __cis__β and _