Poly(ethylene)‐co‐Poly(norborn‐2‐ene) Prepared by Group IV Bisamido and Half‐Sandwich Amido Complexes with Pendant Aminoborane Groups: Vinyl Insertion vs Ring‐Opening Metathesis Polymerization. Issue 9 (26th March 2014)

• Record Type: Journal Article
• Authors: Xu, Guangjuan; Narayana, Gurram Venkata; Speiser, Maria; Wang, Dongren; Zou, Yuanlin; Buchmeiser, Michael R.
• Is Part Of: Macromolecular chemistry and physics. Volume 215:Issue 9(2014:May)
• Page Start: 893
• Page End: 899
• Publication Date: 2014-03-26
• Subjects: Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.201400032
• Languages: English
• ISSNs: 1022-1352

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>A series of Zr^IV and Ti^IV complexes containing the 6‐(2‐(diethylboryl)phenyl)pyridyl‐2‐yl motif are used in the methylalumoxane‐triggered copolymerization of ethylene (E) with norborn‐2‐ene (NBE). ¹³C NMR analyses reveal that vinyl insertion polymerization (VIP)‐derived poly(E)‐<italic>co</italic>‐poly(NBE) is obtained with pre‐catalysts <bold>1–4</bold> and <bold>6</bold>, while pre‐catalyst <bold>5</bold> allows for the synthesis of a copolymer that contains both VIP‐ and ring‐opening metathesis polymerization (ROMP)‐derived structures. All the VIP‐derived poly(E)‐<italic>co</italic>‐poly(NBE) sequences show predominantly isolated NBE/alternating‐syndiotactic E‐NBE, as well as alternating‐isotactic E‐NBE sequences. The microstructure of the copolymers is correlated with the propensity of the pre‐catalysts to allow tandem ROMP‐VIP. <boxed-text content-type="graphic" position="anchor" orientation="portrait"><graphic position="anchor" mimetype="image" xlink:href="ark:/27927/pgg5nq7srgz" orientation="portrait" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></boxed-text></p> </abstract>