Vy. Nedoshivin et al., SYNTHESIS AND PHOTOCHROMIC PROPERTIES OF SPIRO (BENZINDOLINE-NAPHTHOXAZINES), Russian chemical bulletin, 44(4), 1995, pp. 712-717
A new photochromic compound belonging to the class of spiro(indoline-n
aphthoxazines) was synthesized. Nitration of this compound was carried
out and the structures of two photochromic nitro-substituted products
were determined. The photochromic properties of the products were stu
died in solvents of different polarity.