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Helical chirality of poly(quinoxaline-2,3-diyl)s bearing a boronyl pendant at the 5-position of the quinoxaline ring was induced by condensation with chiral guests such as a diol, diamine, and amino alcohol. Reversible induction of a single-handed helical structure was achieved by using less than an equimolar amount of chiral amino alcohols to the boronyl pendants. Majority-rule-effect-based chiral amplification on the polyquinoxaline main chain was demon-strated with chiral amino alcohols with low enantiomeric excess (ee). The helical macromolecular scaffold whose helicity was thus induced was utilized in palladium-catalyzed asymmetric silaboration of meso-methylenecyclopropane (up to 92% ee) by introducing (diarylphosphino)phenyl pendants at their side chains.
This article was published in the following journal.
Name: Journal of the American Chemical Society
The supramolecular structures of organic molecules on planar nanocarbon surfaces such as highly oriented pyrolytic graphite (HOPG) have been extensively studied and the factors that control them are g...
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During induction of anesthesia in children, we have observed significant variability in mask holding technique at our institution among different anesthesia practitioners. Some hold the fa...
This investigation is planned to compare the incidence and severity of postoperative sore throat according to the use of two-handed jaw thrust maneuver in patients undergoing double-lumen ...
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This investigation is planned to compare the incidence and severity of postoperative sore throat according to the use of two-handed jaw thrust maneuver in patients undergoing endotracheal ...
An isoform of DNA that occurs under experimental conditions. It is a right-handed helix that is less compact than the B-form of DNA.
An isoform of DNA that occurs in an environment rich in SODIUM and POTASSIUM ions. It is a right-handed helix with 11 base pairs per turn, a pitch of 0.256 nm per base pair and a helical diameter of 2.3 nm.
The most common form of DNA found in nature. It is a right-handed helix with 10 base pairs per turn, a pitch of 0.338 nm per base pair and a helical diameter of 1.9 nm.
A left-handed double helix of DNA. Its name derives from its narrow zigzag structure that is the least twisted and thinnest form of DNA. Z-DNA forming regions within the GENOME may play an important role in GENE EXPRESSION REGULATION.
Polymers of N-SUBSTITUTED GLYCINES containing chiral centers at the a-position of their side chains. These oligomers lack HYDROGEN BONDING donors, preventing formation of the usual intrachain hydrogen bonds but can form helices driven by the steric influence of chiral side chains.