A novel spiro-oxazine compound of the formula (A): ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7 independently represent hydrogen, (C1 or 2) alkyl, halogenated (C1 or 2) alkyl, (C1 or 2) alkoxy, halogen or nitro, R is unsubstituted or substituted phenyl or naphthyl, and n is 1 to 5. The spiro-oxazine compound is prepared by reacting a precursor of the spiro-oxazine compound of the formula (A), which has a substituent of the formula: --(CH.sub.2).sub.n R in the nitrogen atom of the indoline nucleus, with an .alpha.-nitroso-.beta.-naphthol. The spiro-oxazine compound is valuable as a photochromic material and exhibits enhanced fatigue resistance in photocolorability.
一种新颖的螺环氧噁啉化合物,
化学式为(A):##STR1## 其中R.sup.1、R.sup.2、R.sup.3、R.sup.4、R.sup.5、R.sup.6和R.sup.7独立地表示氢、(C1或2)烷基、卤代(C1或2)烷基、(C1或2)烷氧基、卤素或硝基,R为未取代或取代的苯基或
萘基,n为1至5。该螺环氧噁啉化合物通过将具有
配体的螺环氧噁啉化合物的前体(具有式:--(CH.sub.2).sub.n R的氮原子的
吲哚核)与α-亚硝基-β-
萘酚反应制备而成。该螺环氧噁啉化合物作为一种光致变色材料具有价值,并且在光色可变性中表现出增强的耐疲劳性。