| 摘要 |
alpha -Pyrones of the formula I <IMAGE> (I) in which R1 is -CF3 or -COOR3 and R3 is the radical of a C1-C18 alcohol diminished by a hydroxyl group, and R2 is -F, -Br, -Cl, -CN, -CF3, C1-C18alkyl, C2-C18alkenyl, C2-C18alkynyl, C1-C18alkoxy, C1-C18alkylthio, C1-C18alkylsulfonyl, C6-C16aryl, C7-C24alkaryl, C7-C12aralkyl, C8-C24alkaralkyl, C6-C16aryloxy, C6-C16arylthio, C6-C16arylsulfonyl, C7-C24alkaryloxy, C7-C24alkarylthio, C7-C24alkarylsulfonyl, C7-C12aralkyloxy, C7-C12aralkylthio, C7-C12aralkylsulfonyl, C8-C24alkaralyloxy, C8-C24alkaralylthio, C8-C24alkaralylsulfonyl, secondary amine having 2 to 24 C atoms or trialkylsilyl or trialkoxysilyl each of which has 3 to 18 C atoms. They are suitable for the preparation of naphtho-1,4-quinones and anthra-1,4-quinones, from which tetrathiotetracenes or tetraselenotetracenes having electrochromic properties can be obtained.
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