화학공학소재연구정보센터
Molecular Crystals and Liquid Crystals, Vol.431, 383-389, 2005
Direct nitration reactions of photochromic spirooxazines
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.