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- W2099049254 abstract "Reactions of 2-bromomethyl-3-phenyl-5,6-dicyanopyrazine with methyl substituted pyridine gave dicyanopyrazylmethylene pyridinium bromides. These salts were changed to their corresponding methylides by the addition of a base, which were restored by the addition of an acid. The pyridinium methylides exhibited intense visible absorption. This study was attempted to apply the pyridinium halides with a dicyanopyrazine group to a reversibly colored material to gain an external response. The 1,3-dipolar cycloaddition reaction of such pyridinium azomethine ylides containing a stabilized dicyanopyrazine group with dimethyl acetylenedicarboxylate (DMAD) afforded the indolizine derivatives." @default.
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- W2099049254 date "2005-06-01" @default.
- W2099049254 modified "2023-10-14" @default.
- W2099049254 title "Halochromism of pyridinium azomethine ylides stabilized by dicyanopyrazine group" @default.
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- W2099049254 doi "https://doi.org/10.1016/j.dyepig.2004.07.020" @default.
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