Synthesis of Diarylethene Biradicals

Using this switching unit, several biradical molecules were examined (see below). In the syntheses of these compounds, diiodo derivative 15 was used as 

Na2C03, THF, H20, 60% (d) Pd(PPh3)4, 2-formylthiophene-5-boronic acid, Na2C03, THF, H20, 50% (e) n-BuLi, B(OBu)3 then Pd(PPh3)4, 5-iodo-5 -formyl-2,2 -bithiophene, Na2C03, THF, H20, 48% (f) 2,3-dimethyl-2,3-bis(hydroxyamino)butane sulfate, methanol then Nal04, CH2CI2, 2-15%. 

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As a typical example of diarylethene derivatives, the procedure for the synthesis of diarylethene biradical 10a [37] is given below. 

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