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Bis-Dithiene nickel dyes have been prepared in practical synthetic quantities only as shown below; (Image Omitted)
English (United States)
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Synthesis of Substituted Bis Dithiene Nickel Dyes from Substituted Benzils
Bis-Dithiene nickel dyes have been prepared in practical synthetic quantities
only as shown below;
We have found that benzils can be substituted for benzoins as the starting
material in this reaction if a small amount of water is added at the initiation of the
One advantage of this synthetic modification is that it simplifies the synthesis
of those dyes for which the benzil is a natural precursor since a separate
reduction step to the benzoin (usually accomplished with dithionite) is avoided.
Also, most benzoins are oils requiring expensive extraction procedures to isolate.
Benzils, on the other hand, are usually solids and can easily be isolated and
purified. Thus, this in situ reduction procedure allows the elimination of a tedious
isolation step and gives overall high yields of dyes.
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