Anionic Monosubstituted Cyclopentadienylsamarium Derivatives: Catalysts for a Stereospecific Isoprene Polymerization
✍ Scribed by Denise Baudry-Barbier; Nicolas Andre; Alain Dormond; Christine Pardes; Philippe Richard; Marc Visseaux; Cheng Jian Zhu
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 198 KB
- Volume
- 1998
- Category
- Article
- ISSN
- 1434-1948
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✦ Synopsis
5 )[C(NiPr) 2 (CMe) 2 ] (1Ј). Crystals of 1Ј were isolated but this new compound undergoes a partial were synthesized from (CpЈ 2 SmCl) 2 and from the magnesium derivative [Me 4 C 2 (C 5 H 4 ) 2 ]SmCl • MgCl 2 (THF) 4 (4). The ansa rearrangement into a tris-CpЈ species in solution. Similar behaviour is observed for the analogous complex anionic complex 2 exhibited good activity for the stereospecific 1,4-trans polymerization of isoprene, whereas CpЈ 2 SmCl[C(NiPr) 2 (CMe) 2 ] (1ЈЈ). The X-ray crystal structure revealed the formation of the adduct, as a toluene solvate, the neutral derivative 1 was inactive. In the same way, the anionic complex [CpЈ 2 SmMe 2 ]Li(dioxane) (3) was found to be which exists in benzene solution in equilibrium with CpЈ 3 Sm and CpЈSmCl 2 [C(NiPr) 2 (CMe) 2 ] 2 . The catalytic behaviour of an ethylene polymerization catalyst of very short lifetime. The lack of reactivity of 1 is related to the associated 2 is compared with that of other early lanthanide derivatives.