Results 131 to 140 of about 28,983 (170)
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Acta Crystallographica Section C Crystal Structure Communications, 2000
The furocoumarin 1,2-dihydro-2-(1,2-dihydroxyprop-2-yl)-8H-furo[2,3-h]benzopyran-8-one crystallizes from methanol-water as the monohydrate C(14)H(14)O(5).H(2)O. Both chiral centers have the S configuration. Both OH groups and both H atoms of the water molecule form intermolecular hydrogen bonds with O.O distances in the range 2.7686 (18)-2.8717 (18) A.
F H, Billiot +3 more
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The furocoumarin 1,2-dihydro-2-(1,2-dihydroxyprop-2-yl)-8H-furo[2,3-h]benzopyran-8-one crystallizes from methanol-water as the monohydrate C(14)H(14)O(5).H(2)O. Both chiral centers have the S configuration. Both OH groups and both H atoms of the water molecule form intermolecular hydrogen bonds with O.O distances in the range 2.7686 (18)-2.8717 (18) A.
F H, Billiot +3 more
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Journal of Theoretical Biology, 2004
Twisting is a prevalent feature of long, thin vertical leaves; it has been shown that this twist contributes to the mechanical integrity of the leaf. We address the question as to how this twist comes about, and posit that it is a reflection of twist at a lower structural (geometric) level.
Schulgasser, Kalman, Witztum, Allan
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Twisting is a prevalent feature of long, thin vertical leaves; it has been shown that this twist contributes to the mechanical integrity of the leaf. We address the question as to how this twist comes about, and posit that it is a reflection of twist at a lower structural (geometric) level.
Schulgasser, Kalman, Witztum, Allan
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Chirality
ABSTRACTInclusion complexation, hydrogen bonds, π–π interaction, dipole–dipole interaction, and steric hindrance effect all contribute to the enantioseparation ability of cyclodextrin (CD) or CD derivatives. In this work, one native cationic CD chiral stationary phases (SHCDCSP) and four derivatized CD‐CSPs, namely, per(4‐trifluoromethyl ...
Xiaoxuan Li +3 more
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ABSTRACTInclusion complexation, hydrogen bonds, π–π interaction, dipole–dipole interaction, and steric hindrance effect all contribute to the enantioseparation ability of cyclodextrin (CD) or CD derivatives. In this work, one native cationic CD chiral stationary phases (SHCDCSP) and four derivatized CD‐CSPs, namely, per(4‐trifluoromethyl ...
Xiaoxuan Li +3 more
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Macromolecules, 2016
Producing supramolecular chirality from achiral π-conjugated polymers toward preferred chiral memory, effective circularly polarized luminescence, and chiral sensor is extremely important in design of functional chiral materials. Proposed herein is an effective protocol to generate and memorize the supramolecular chirality formed from achiral poly(9,9 ...
Yin Zhao +7 more
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Producing supramolecular chirality from achiral π-conjugated polymers toward preferred chiral memory, effective circularly polarized luminescence, and chiral sensor is extremely important in design of functional chiral materials. Proposed herein is an effective protocol to generate and memorize the supramolecular chirality formed from achiral poly(9,9 ...
Yin Zhao +7 more
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Mechanical chirality: A chiral catalyst with a ring to it. [PDF]
Nature chemistry, 2016 A chiral [2]rotaxane in which the asymmetry is derived from the way in which the two components are mechanically interlocked — rather than being encoded in the covalent connectivity of the components themselves — has been shown to act as an enantioselective organocatalyst.
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On chirality measures and chirality properties
Canadian Journal of Chemistry, 2000It is shown that chiral zeroes are integral to all pseudoscalar functions, and that these functions, and thus the chirality properties that are described by them, are therefore normally unsuitable as chirality measures. The multidimensional nature of chirality properties is explored.
Noham Weinberg, Kurt Mislow
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Journal of the Physical Society of Japan, 2004
Summary: The theory distinguishing the molecular chirality in the optical transition is presented. The characteristic combination responsible for this transition is the angular momentum of molecule and the magnetic field produced by photons. The amplitude is so small estimated \(v/c\) times that of the dipole transition. The specified model employed is
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Summary: The theory distinguishing the molecular chirality in the optical transition is presented. The characteristic combination responsible for this transition is the angular momentum of molecule and the magnetic field produced by photons. The amplitude is so small estimated \(v/c\) times that of the dipole transition. The specified model employed is
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2023
A word $w$ in a free group is called {\em chiral} if there exists a group $G$ such that image of word map corresponding to word $w$ is not closed with respect to inverse. Similarly a group $G$ is said to be {\em chiral} if there exists a word $w$ in free group such that $w$ exhibits chirality on the group $G$. Gordeev et al.
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A word $w$ in a free group is called {\em chiral} if there exists a group $G$ such that image of word map corresponding to word $w$ is not closed with respect to inverse. Similarly a group $G$ is said to be {\em chiral} if there exists a word $w$ in free group such that $w$ exhibits chirality on the group $G$. Gordeev et al.
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Trends in Biochemical Sciences, 2000
The gypsy moth Lymantria dispar is a persistent pest in Europe, Asia and North America, causing major deforestation as a result of outbreaks approximately every ten years. Each spring the mating period is a chemical frenzy, with stationary females attracting males up to a kilometer away with released sex pheromones.
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The gypsy moth Lymantria dispar is a persistent pest in Europe, Asia and North America, causing major deforestation as a result of outbreaks approximately every ten years. Each spring the mating period is a chemical frenzy, with stationary females attracting males up to a kilometer away with released sex pheromones.
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