Abriefreview on the advances and developingtrends ofindoline spiropyran photochromic compounds in recent years is given with 45 references.

Using 2-naphthol phenylhydrazine and 3-methyl-2-butanone as main raw materials,the title compound 1,3,3-trimethylindolinespironaphthopyran containing naphthalene ring was designed and synthesized through a series of reaction.

AIM: To develop a simple and economical new synthetic method of 8 nitro 6 ethenyl 1,3,3 trimethyl spirorindolinebenzopyan.

Synthesis and photochromic properties of bromo substituent indolinobenzospiropyran compounds;