Synthesis of conjugated poly(acrylene)s with 1,2-type (η4-cyclobutadiene)cobalt moieties in the main chain

Macromolecular Chemistry and Physics

Volumn 201, Issue 5, 2000, Pages 510-514

  Sawada, Yuko ^a   Tomita, Ikuyoshi ^a   Endo, Takeshi ^a  

^a Tokyo Institute of Technology ^*  (Japan)

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Indexed keywords

EID: 0000825929     PISSN: 10221352     EISSN: None     Source Type: Journal    
DOI: 10.1002/(SICI)1521-3935(20000301)201:5<510::AID-MACP510>3.0.CO;2-Y     Document Type: Article

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28. Isomeric distribution of 1,2- and 1,3-isomers is expected to be the same as the selectivity is mainly governed by the steric bulkiness of the substituents on the acetylene moieties. The slight difference in yields might be due to the close spatial proximity of hydroxy groups of two acetylene molecules by a hydrogen bonding at the metallacyclization step
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30. When the polymers were isolated by precipitation with methanol, they are sticky most probably because by the contamination by oligomeric products. On further isolation by HPLC, the polymers in glassy state could be isolated
31. After heating at 350°C for 10 min (i.e., ca. 30°C lower than the decomposition temperature), the molecular weight of 3d was reestimated by GPC to find no outstanding change. This result was further supported by the high stability of the polymers below the decomposition temperature
32. Though the results are not sufficiently speculated, they may be possibly ascribed to the samples incompletely oriented or mingled with a few impurities