| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5220393 | Tetrahedron | 2012 | 9 Pages |
Abstract
A new class of ortho- and meta-substituted tetraphenols at the terminal phenyl residues with a biphenylene unit in the middle were synthesized and the effect of the substitution position on the spiroborate-based double-stranded helicate formation with sodium borohydride was investigated. The ortho-substitution considerably hampered the spiroborate formation between the terminal biphenol units and the boron atoms, whereas the meta-substituted oligomers formed a double-stranded helicate bridged by spiroborate groups accommodating a sodium cation in the center, which displayed an extension and contraction motion triggered by the removal and addition of sodium ions in solution.
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Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Kazuhiro Miwa, Kaori Shimizu, Heejun Min, Yoshio Furusho, Eiji Yashima,