在苯并吡喃部分含有硝基的螺吡喃显示出逆光致变色行为，其它的则为普通光致变色化合物。
The spiropyrans with a nitro group at the benzopyran moiety showed reverse photochromic behavior, others were normal photochromic compounds.
合成三种N，N＇-1，4-亚丁基双螺吡喃和双螺恶嗪光致变色化合物，通过红外光谱、核磁共振氢谱及元素分析确证其结构。
Three photochromic N, N'-1,4-tetramethylene bisspiropyran and bisspirooxazine compounds were synthesized. They have been identified by IR spectra, 1H -NMR spectra and elemental analysis;
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