Claims
- 1. A dye which satisfies the formula: ##STR34## where E.sup.1 and E.sup.2 are independently selected to satisfy the formula: ##STR35## R.sup.1, R.sup.2, and R.sup.5 each independently represent hydrogen, alkyl, or aryl;
- R.sup.3 and R.sup.4 each independently represent alkyl; and
- X.sup.1 and X.sup.2 are independently hydrogen, alkyl, or aryl or together complete a 5 to 7 membered ring and satisfy the formula:
- --(CH.sub.2).sub.n --
- or
- --(CH.sub.2 --Y--CH.sub.2)--
- where
- n is 2 to 4;
- Y is --NR.sup.10 -- or --O--; and
- R.sup.10 is lower alkyl of from 1 to 3 carbon atoms or phenyl;
- alkyl, with the exception of said lower alkyl, in each occurrence containing from a to 8-carbon atoms and aryl in each occurrence being phenyl or naphthyl.
- 2. A dye according to claim 1 in X.sup.1 and X.sup.2 represent the atoms completing a cyclopentanone ring.
Parent Case Info
This is a divisional of application Ser. No. 191,948, May 9, 1988, now U.S. Pat. No. 4,900,831.
US Referenced Citations (9)
Non-Patent Literature Citations (1)
Entry |
Soo et al., "Sur Quelq. Prop. Formyl-21-Benzofuran", Bull. Soc. Chim. France, pp. 1875-1877 (1962). |
Divisions (1)
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Number |
Date |
Country |
Parent |
191948 |
May 1988 |
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