Results 81 to 90 of about 33,103 (197)

Spontaneous and Directed Symmetry Breaking in the Formation of Chiral Nanocrystals

, 2018
The homochirality of biomolecules remains one of the outstanding puzzles concerning the beginning of life. Chiral amplification of a randomly perturbed racemic mixture of chiral molecules is a well-accepted prerequisite for all routes to biological ...
Ben-Moshe, Assaf, Diamant, Haim, Hananel, Uri, Markovich, Gil   +3 more
core  

Is Amino-Acid Homochirality Due To Asymmetric Photolysis In Space? [PDF]

, 1999
Amino acids occurring in proteins are, with rare exceptions, exclusively of the L-configuration. Among the many scenarios put forward to explain the origin of this chiral homogeneity (i.e., homochirality), one involves the asymmetric photolysis of amino ...
Cerf, C., Jorissen, A.
core   +1 more source

Synthesis of Tertiary and Quaternary Amine Derivatives from Wood Resin as Chiral NMR Solvating Agents

Molecules, 2015
Chiral tertiary and quaternary amine solvating agents for NMR spectroscopy were synthesized from the wood resin derivative (+)-dehydroabietylamine (2). The resolution of enantiomers of model compounds [Mosher’s acid (3) and its n-Bu4N salt (4)] (guests ...
Tiina Laaksonen, Sami Heikkinen, Kristiina Wähälä   +2 more
doaj   +1 more source

Rapid Enantiomeric Excess Measurements of Enantioisotopomers by Molecular Rotational Resonance Spectroscopy. [PDF]

Org Process Res Dev, 2023
Sonstrom RE, Vang ZP, Scolati HN, Neill JL, Pate BH, Clark JR.   +5 more
europepmc   +1 more source

Chiral Crystal Growth under Grinding

, 2008
To study the establishment of homochirality observed in the crystal growth experiment of chiral molecules from a solution under grinding, we extend the lattice gas model of crystal growth as follows. A lattice site can be occupied by a chiral molecule in
Becker R., Brandenburg A., Frank F. C., Japp F. R., Kipping F. S., Kondepudi D. K., Mauksch M., Noorduin W. L., Noorduin W. L., Ostwald W., Pasteur L., Plasson R., Saito Y., Saito Y., Saito Y., Saito Y., Sato I., Shibata R., Soai K., Uwaha M., Uwaha M., Viedma C.   +21 more
core   +1 more source

Asymmetric transformation of achiral gold nanoclusters with negative nonlinear dependence between chiroptical activity and enantiomeric excess. [PDF]

Nat Commun, 2023
Liu C, Zhao Y, Zhang TS, Tao CB, Fei W, Zhang S, Li MB.   +6 more
europepmc   +1 more source

Chirality Selection in Open Flow Systems and in Polymerization

, 2005
As an attempt to understand the homochirality of organic molecules in life, a chemical reaction model is proposed where the production of chiral monomers from achiral substrate is catalyzed by the polymers of the same enatiomeric type. This system has to
Brandenburg A., Feringa B. L., Frank F. C., Saito Y., Saito Y., Saito Y., Saito Y., Sandars P. G. H., Sato I., Soai K.   +9 more
core   +1 more source

On the origins of life's homochirality: Inducing enantiomeric excess with spin-polarized electrons. [PDF]

Proc Natl Acad Sci U S A, 2022
Ozturk SF, Sasselov DD.
europepmc   +1 more source

Stereoselective formation of a 2 prime (3 prime)- aminoacyl ester of a nucleotide [PDF]

Reaction of DL-series and adenosine-5-phosphorimidazolide in the presence of adenosine-5'-(0-methylphosphate) and imidazole resulted in the stereoselective synthesis of the aminoacyl nucleotide ester, 2'(3')-0-seryl-adenosine-5'-(0-methylphosphate).
Weber, A. L.
core   +1 more source

Determination of Enantiomeric Excess and Diastereomeric Excess via Optical Methods. Application to α-methyl-β-hydroxy-carboxylic acids. [PDF]

Org Chem Front, 2023
Moor SR, Howard JR, Herrera BT, McVeigh MS, Marini F, Keatinge-Clay AT, Anslyn EV.   +6 more
europepmc   +1 more source