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6667832 
Journal Article 
Stereoselective Polymerization of an Aromatic Vinyl Monomer to Access Highly Syndiotactic Poly(vinyl alcohol) 
Huang, J; Jiang, Y; Zhang, Z; Li, S; Cui, D; , 
2020 
1 
Macromolecular Rapid Communications
ISSN: 1022-1336
EISSN: 1521-3927 
WILEY-V C H VERLAG GMBH 
WEINHEIM 
41 
10 
English 
32285525 
WOS:000525926800001 
Streoregular poly(vinyl alcohol) is hard to obtain because vinyl alcohol is unstable relative to its tautomer acetaldehyde, and the monomer precursor vinyl ester is poisonous to the coordination catalyst. Herein, the coordination polymerization of 2-vinyl-2,1-borazanaphthalene (BN2VN) is reported by the linked or unlinked half-sandwich ligands attached scandium precursors ((FluSiMe(3))Sc(CH2SiMe3)(2)(THF) (THF = tetrahydrofuran, 1), (FluCH(2)CH(2)-NHC-R)Sc(CH2SiMe3)(2)(THF) (R = mesityl 2, Pr-i 3, Me 4), and (FluCH(2)Py)Sc(CH2SiMe3)(2) (5) for the first time. Among these precursors, complex 5 converts 600 equivalents of BN2VN into polymer within 5 min to reach an activity as high as 8.99 x 10(5) g mol(Sc)(-1) h(-1). The resultant products show excellent syndiotacticity and melting temperatures above 300 degrees C, which can be transferred to syndiotactic poly(vinyl alcohol) with 90% rr triad content by postpolymerization oxidation. 
Chemistry--Organic Chemistry; catalysts; monomers; poly(vinyl alcohol); scandium; stereoelective polymerization; Tetrahydrofuran; Polymerization; Oxidation; Stereoselectivity; Polyvinyl alcohol; Vinyl ester resins; Coordination; Acetaldehyde; Polymers; Precursors; Alcohol; Syndiotacticity; Alcohols