Five 1,1,3-trisubstituted naphtho [2,3-c]pyran-5,10-dione derivatives were designed and synthesized in five steps from 2-acetyl-1,3-indandione. Prepared quinones 6a-e instantly changed from either red or blue to yellow or orange red, when treated with sodium borohydride in methanol. The resulting reduced hydroquinones 9a-e reverted to their original colors within a few minutes after the reducing agent was
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