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depending upon the substituent of maleimide derivatives (Fig. 1
and Table 1).
Moreover, the phencyclone derivatives have distinct peaks
above 400 nm, which disappear after the Diels–Alder reaction. This
phenomenon allows the progress of the reaction to be determined
by color change. The color of the reaction turns from dark green to
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Acknowledgment
This work was supported by a fund from Bergische Universität
Wuppertal.
Supplementary data
Supplementary data associated with this article can be found, in
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