Dinuclear Pentacoordinated Organoyttrium Biphenolates as Initiators for the Synthesis of High-Molecular Weight Isotactic Poly(2-vinylpyridine).

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2019
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Abstract
Dinuclear organoyttrium biphenolato complexes have been synthesized for the first time starting from Y(CHSiMe)(THF) and readily available biphenols with bulky substituents at the 3,3'-positions. XRD analysis revealed that these complexes are formed as homochiral dimers even though racemic biphenols were employed. Such dinuclear penta-coordinated yttrium complexes were evaluated as initiators in the polymerization of 2-vinylpyridine (2-VP). High activity and excellent isotacticity (mm > 99%) were observed. DSC analysis of poly(2-VP) showed a = 221 °C, which is the highest value reported to date. Attempts to improve the low initiation efficiency of the present system were made by co-use with several organo-main-group metal reagents. Specifically, good molecular weight control within the high region was achieved by the addition of EtAl (Al/Y = 10).
Reference Key
oishi2019dinuclearinorganic Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Oishi, Masataka;Yoshimura, Reiji;Nomura, Nobuyoshi;
Journal Inorganic chemistry
Year 2019
DOI
10.1021/acs.inorgchem.9b02385
URL
Keywords
phenol horseradish peroxidase formaldehyde-free phenolic polymer tween 20

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