Process for preparing the spiropyrone compounds

Details Process for preparing the spiropyrone compounds Process for preparing the spiropyrone compounds

1994-04-08

1997-12-02

Ivy, C. Warren

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D49310, C07D49300

Patent

active

056938306

ABSTRACT:
Spiropyrone compounds represented by the general formula ##STR1## wherein ##STR2## is a substituted or an unsubstituted aromatic hydrocarbon group or a substituted or an unsubstituted unsaturated heterocyclic group, and ##STR3## that are starting materials of spiropyran compounds which change from a colorless state into a colored or a densely colored state upon irradiation with the light containing ultraviolet rays such as the sunlight or the light of a mercury lamp, the change being reversible, and a process for preparing the spiropyrone compounds. The process comprises reacting a compound represented by the general formula ##STR4## wherein ##STR5## is as defined above, with a compound of the general formula ##STR6## wherein ##STR7## is as defined above.

REFERENCES:
patent: 4980089 (1990-12-01), Heller
Chemical Abstracts vol. 117 (20) #701990f, Tanaka et al. (1992) "Photochromic spiropyran compounds and their manufacture".
Chemical Abstracts vol. 115 (1) #8577g, Tanaka et al (1990) "Preparation of photochromic spiroarylpyran compounds".
Chemical Abstracts, vol. 115(14) #146678s, Imura et al. (1991) "Fast-fading photochromic chromene compositions".
Chemical Abstracts vol. 114(5) 42796s, Melzig (1990) "Preparation of

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