title: Regio- and Stereochemical Control in Ocimene Polymerization by Half-Sandwich Rare-Earth Metal Dialkyl Complexes.
abstract: The polymerization of ocimene has been first achieved by half-sandwich rare-earth metal dialkyl complexes in combination with activator and Al(i) Bu3 . The regio- and stereoselectivity in the ocimene polymerization can be controlled by tuning the cyclopentadienyl ligand and the central metal of the complex. The chiral cyclopentadienyl-ligated Sc complex 1 prepares syndiotactic cis-1,4-polyocimene (cis-1,4-selectivity up to 100%, rrrr = 100%), while the corresponding Lu, Y, and Dy complexes 2-4 and the achiral pentamethylcyclopentadienyl Sc, Lu, and Y complexes 5-7 afford isotactic trans-1,2-polyocimenes (trans-1,2-selectivity up to 100%, mm = 100%).
authors.affiliation: Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry, Beijing Institute of Technology, Beijing, 100081, P. R. China.
authors.forename: Deqian
authors.initials: D
authors.lastname: Peng
authors.affiliation: Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry, Beijing Institute of Technology, Beijing, 100081, P. R. China.
authors.forename: Gaixia
authors.initials: G
authors.lastname: Du
authors.affiliation: Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry, Beijing Institute of Technology, Beijing, 100081, P. R. China.
authors.forename: Pengfei
authors.initials: P
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry, Beijing Institute of Technology, Beijing, 100081, P. R. China.
authors.forename: Bo
authors.initials: B
authors.lastname: Yao
authors.affiliation: Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry, Beijing Institute of Technology, Beijing, 100081, P. R. China.
authors.forename: Xiaofang
authors.initials: X
authors.lastname: Li
authors.affiliation: Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry, Beijing Institute of Technology, Beijing, 100081, P. R. China.
authors.forename: Shaowen
authors.initials: S
authors.lastname: Zhang
mesh_terms: D000080462:Acyclic Monoterpenes; D000475:Alkenes / Q000138:chemical synthesis* / Q000737:chemistry; D008674:Metals, Rare Earth / Q000737:chemistry*; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D058105:Polymerization; D013237:Stereoisomerism
chemical_list: D000080462:Acyclic Monoterpenes; D000475:Alkenes; D008674:Metals, Rare Earth; D009942:Organometallic Compounds; C443996:beta-ocimene
keywords: homogeneous catalysis; ocimene; polymerization; rare-earths; regio/stereoselectivity