Claims
- 1. A substantially colorless di- or triarylmethane compound of the formula ##STR54## wherein ring B represents a carbocyclic aryl ring or a heterocyclic aryl ring; C.sub.1 represents the meso carbon atom of said di- or triarylmethane compound; X represents ##STR55## or --CH.sub.2 -- and completes a moiety ring-closed on said meso carbon, said moiety including the nitrogen atom bonded directly to said meso carbon; Y represents ##STR56## wherein L is a leaving group that departs upon thermal fragmentation to unmask --N=C=O for effecting intramolecular acylation of said nitrogen atom to open the N-containing ring and form a new group in the ortho position of ring B that cannot bond to said meso carbon atom; E is hydrogen, an electron-donating group, an electron-withdrawing group or a group, either an electron-donating group or an electron-neutral group, that undergoes fragmentation upon heating to liberate an electron-withdrawing group; s is 0 or 1 and Z and Z' taken individually represent the moieties to complete the auxochromophoric system of a diarylmethane or triarylmethane dye when said N-containing ring is open and Z and Z' taken together represent the bridged moieties to complete the auxochromophoric system of a bridged triarylmethane dye when said N-containing ring is open.
- 2. A substantially colorless compound as defined in claim 1 wherein s is 0.
- 3. A substantially colorless compound as defined in claim 1 wherein X is
- 4. A substantially colorless compound a defined in claim 1 wherein Z and Z' taken individually or taken together represent the moieties to complete the auxochromophoric system of a triarylmethane dye or a bridge triarylmethane dye when said N-containing ring is open.
- 5. A substantially colorless compound as defined in claim 1 wherein said ring B is a carbocyclic aryl ring.
- 6. A substantially colorless compound of the formula ##STR57##
- 7. A substantially colorless compound as defined in claim 1 wherein X is --CH.sub.2 --.
CROSS-REFERENCE TO RELATED APPLICATION
This is a division of application Ser. No. 861,377, filed May 14, 1986 (now U.S. Pat. No. 4,720,449 issued Jan. 19, 1988).
This application is a continuation-in-part of copending application Ser. No. 740,889 filed June 3, 1985 now abandoned.
US Referenced Citations (3)
Divisions (1)
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Number |
Date |
Country |
Parent |
861377 |
May 1986 |
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