SEARCH Articles Figures Tables Benzene, 1,3-dimethoxyMannich reaction use in Houben-Hoesch synthesis HOUBEN-HOESCH Hoesch Hoesch reaction Houben Houben-Hoesch reaction, aluminum chloride Intramolecular Houben-Hoesch reaction Regioselectivity Houben-Hoesch reaction The Houben-Hoesch reaction