CHEMISTRY GLOSSARY racemic mixture racematna smjesa Racemic mixture is a mixture of dextrorotatory and levorotatory optically active isomers in equal amounts. Because the two enantiomers rotate plane-polarised light in opposite directions, a racemic mixture does not rotate plane-polarised light. These...
The DCL of a racemic mixture of 1 and R,R-2 is an SDRRM because, with the exception of the DAAD catenane and the two DA heterodimers where we see some erosion of chirality, all of the other library members contain either only one of the enantiomers of 1 or a mixture of R,R-1, ...
A significance test applied to the fits obtained for each of the six static models tested indicate that the best single representation of the molecule has a chair conformation, although a mixture containing other conformations could not be definitely eliminated. It was not possible to conclusively ...
as obtained by image analysis, of GVs prepared from the lipid mixture Mix A. The experimental distribution (grey bars) has been fitted with a log-normal curve (red line). The population is described
(Fig.3, bottom traces). Additional peaks such as the satellite peak at around 1078 cm−1in crude mixture containing rac-DOPA, and at 980 cm−1in mixtures containingrac-DOPE (Fig.3, top lanes) suggested the presence of the third chemical compound for bothrac-DOPA andrac-DOPE ...
Another radio-frequency resonance at 273 MHz was also investigated and the results are given in this paper together with their equivalents in all three lines in the racemic mixture. This high-resolution spectroscopic investigation does not show with a clear level of confidence the differences ...
It is worth noting that the intensities of various diffraction peaks in the copolymer sample fromracemiccatalyst are obviously lower than the stereocomplexed PCXC obtained from the 1:1 mixture of the opposite enantiomers (Fig. 3, bottom, plots B and C). In addition, the melting endothermic pea...
In the past several decades, for lower-level assembly structures of simple organic molecules, several models describe how to amplify a single chirality by chiral transition from a mixture of different primary enantiomers, such as the so-called “sergeants and soldiers” effect and the “majority ru...
After filtration of the mixture and evaporation of the solvent, the crude product was purified by preparative thin layer chromatography on silica (toluene/hexane = 90/10) to afford the corresponding ester (S)-4f (38.6 mg, 40% yield, 76% ee) as a colorless oil. The polar fraction ...
1H NMR experiments with lanthanide shifts reagents (LSR) The synthesis used to prepare 9 must result in a racemic mixture and, since racemization of this kind of compounds is highly improbable, the same should happen to 10 and 11. We carried out some experiments to find out if 1H NMR in ...