The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 30, 1991
Filed:
May. 24, 1989
Vratislav Kvita, Reinach, CH;
Marcus Baumann, Basel, CH;
Walter Fischer, Reinach, CH;
Carl W Mayer, Riehen, CH;
Thomas Allmendinger, Steinen, DE;
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
.alpha.-Pyrones of the formula I ##STR1## in which R.sup.1 is --CF.sub.3 or --COOR.sup.3 and R.sup.3 is the radical of a C.sub.1 -C.sub.18 alcohol diminished by a hydroxyl group, and R.sup.2 is --F, --Br, --Cl, --CN, --CF.sub.3, C.sub.1 -C.sub.18 alkyl, C.sub.2 -C.sub.18 alkenyl, C.sub.2 -C.sub.18 alkynyl, C.sub.1 -C.sub.18 alkoxy, C.sub.1 -C.sub.18 alkylthio, C.sub.1 -C.sub.18 alkylsulfonyl, C.sub.6 -C.sub.16 aryl, C.sub.7 -C.sub.24 alkaryl, C.sub.7 -C.sub.12 aralkyl, C.sub.8 -C.sub.24 alkaralkyl, C.sub.6 -C.sub.16 aryloxy, C.sub.6 -C.sub.16 arylthio, C.sub.6 -C.sub.16 arylsulfonyl, C.sub.7 -C.sub.24 alkaryloxy, C.sub.7 -C.sub.24 alkarylthio, C.sub.7 -C.sub.24 alkarylsulfonyl, C.sub.7 -C.sub.12 aralkyloxy, C.sub.7 -C.sub.12 aralkylthio, C.sub.7 -C.sub.12 aralkylsulfonyl, C.sub.8 -C.sub.24 alkaralyloxy, C.sub.8 -C.sub.24 alkaralylthio, C.sub.8 -C.sub.24 alkaralylsulfonyl, 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.