New photochromatic and thermochromatic compounds of the spiro-oxazepin-oxazine class are definable by the general formula (I): ##STR1## where the substituents R and R.sub.1 -R.sub.12 are as defined in the description. The process for the preparation of the compounds (I) is described, as is their use as photochromatic and thermochromatic agents.
新的光致变色和热致变色螺-
噁唑啉-
噁唑类化合物可由通式(I)定义:##STR1## 其中取代基R和R.sub.1-R.sub.12如描述中所定义。描述了制备化合物(I)的过程,以及它们作为光致变色和热致变色剂的用途。