Direct Nitration Reactions of Photochromic Spirooxazines
摘要:
A direct nitration of photochromic spirooxazines was carried out by three different methods. The molecular structure of main products was determined by NMR H-1 and C-13 spectra. The nitration mechanisms were proposed. It was shown that only nitration by mixture of nitric and sulfuric acids gives photochromic compounds with nitrogroup in aryloxazine ring.