| abstract |
α-pyrones of the formula I. wherein R¹ is -CF₃ or -COOR³ and R³ is the hydroxyl group-reduced radical of a C₁-C₁₈ alcohol, and R² -F, -Br, -Cl, -CN, -CF₃, C₁-C₁₈-alkyl, C₂-C₁₈ -Alkenyl or -alkynyl, C₁-C₁₈-alkoxy, C₁-C₁₈-alkylthio, C₁-C₁s-alkylsulfonyl, C₆-C₁₆-aryl, C₇-C₂₄-alkaryl, C₇-C₁₂-aralkyl, C₈-C₂₄-alkaralkyl, C₆- C₁₆-aryloxy or -thio or -sulfonyl, C₇-C₂₄-alkaryloxy or -thio or -sulfonyl, C₇-C₁₂-aralkyloxy or -thio or -sulfonyl or C₈-C₂₄-alkaralkyloxy or -thio or -sulfonyl, secondary amino with 2 to 24 carbon atoms, or trialkyl or trialkoxysilyl having 3 to 18 carbon atoms. They are suitable for the production of naphtho and anthra-1,4-quinones from which tetrathio- or tetraselenotetracenes can be obtained which have electrochromic properties. |