Reductive cyclization of 2,2′-dimethoxymethyl-[1,1′-bianthracene]-9,9′,10,10′-tetrone with Cu powder in concentrated sulfuric acid yields helianthrone with partially reduced side chain.
用浓
硫酸中的
铜粉还原环化2,2′-二甲氧基甲基-[1,1′-双
蒽]-9,9′,10,10′-四酮,得到部分还原的侧链的向日葵酮。