Pyrrole Studies. Part 26. A Novel Thermochromic and Photochromic Pyrrole System
2-Dichloromethyl-3,5-bisethoxycarbonyl-4-methylpyrrole (3) yields a thermally labile 5,10-methylenedioxy-5H,10H-dipyrrolopyrazine (1) when heated with 6percent aqueous potassium hydroxide.Upon being heated at 160 deg C the colourless dipyrrolopyrazine is converted into a red bis-(1-azafulvene) system, which can be reconverted photochemically into the dipyrrolopyrazine via a cycloaddition reaction.
Brittain, Judith M.,Jones, R. Alan,Jones, Richard O.,King, Trevor J.
p. 2656 - 2661
(2007/10/02)
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