SYNTHESIS AND PHOTOCHROMIC PROPERTIES OF NITRO-SUBSTITUTED SPIRONAPHTHOOXAZINES
7-Nitro- and 8-nitroderivatives of 1',3',3'-trimethylspirooxazine> were synthesized, the last of them being prepared by direct nitration.The introduction of the nitro group stabilizes a bipolar colored form, the highest stability being exhibited when the NO2 group is the 8-position.
Nedoshivin, V. Yu.,Lyubimov, A. V.,Zaichenko, N. L.,Marevtsev, V. S.,Cherkashin, M. I.