The Preparation of New C(α)-Dianions

References

• To whom inquires should be addressed.
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• In many cases, the initial evidence for the formation of a multiple anion was the orange to red-black color of the solution obtained after the addition of n-butyllithium was complete. See also the mechanism discussion in reference 16
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• Hauser prepared the dianions at -78[ddot] and most of our dianions were prepared at 0[ddot]. Some in-between temperatures, or C(α)-DIANONS sequential addition of two different bases may be necessary to prepare and condense these dianions with aldehydes. See also: reference 9
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• The Aldol-type condensation and the retro-Aldol cleavage appears to be time dependent, and optimum condensation times may vary from a few seconds to more than 30 min. See also: reference 3
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