Enantiomeric excess, magnetic

Fig. 9 Summary of the time constant results. The squares are the points for + magnetization, and the circles are the points for -magnetization. The filled points are for (R)-2-butanol and the open points are for (S)-2-butanol. The lines represent the average values solid, (/J)-2-butanol dashed, (S)-2-butanol. The solid line in the inset shows the enantiomeric excess (ee) based on the time constant difference (10%) as a function of time in terms of the time constant, t. The dashed line shows the remaining concentration...

Figure 4 Enantiomeric excess (ee) obtained after irradiation of a racemic Cr(III)trisJ oxalato solution with unpolarized light at A = 695.5 nm, as a function of magnetic fielcL with an irradiation direction k either parallel or perpendicular to the magnetic field Bij Each point was obtained with a fresh racemic starting solution. (From Ref. 28.)...

Rikken and Raupach used the MChD effect to favour the production of one enantiomer over the other in the photochemical racemization of the complex [Cr(C204)3]K3. However, the enantiomeric excess obtained as a function of the wavelength of the incident light was very low ee from —1.10 " to 0.5.10 " ), even for a magnetic field as strong as 7.5 T. This phenomenon was predicted by Barron in a provocative article entitled Can a magnetic field induce asymmetric synthesis . 

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