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Oxygen absorber reaction [duplicate]

In my chemistry textbook, it is written that: Alkaline potassium pyrogallate solution absorbs oxygen and turns brown. I am just curious what the reaction is. On the internet it is showing that the ...
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1,1-Diphenylethylene subproduct/impurity

I'm working with 1,1-diphenylethylene and I've observed that, if left at room temperature in the air atmosphere, a white insoluble powder forms. I'm unable so dissolve this powder in every solvent ...
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