Abstract
WHEN a trace of maleic anhydride (I) is added at room temperature to a colourless solution of tri-phenylphosphine (P Ph3) in chloroform or benzene (for example, 1 drop of 1 per cent maleic anhydride solution to 1 c.c. of a 1 per cent solution of triphenyl-phosphine), a permanent orange-red colour is produced immediately.
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SCHÖNBERG, A., ISMAIL, A. A Colour Reaction of Maleic Anhydride, p-Benzoquinone and their Partially Substituted Derivatives. Nature 144, 910 (1939). https://doi.org/10.1038/144910a0
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DOI: https://doi.org/10.1038/144910a0
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