| 摘要 |
<p>The present invention relates to a method for the preparation of photochromic compounds having the spiro[indolin-[2,3']-benzoxazine] ringed structure (formula III), comprising the reaction of a Fischer base of the alkylideneindolin type with a ringed orthoaminophenol in the presence of an oxydant such as dimethylsulfoxide, the selenium bioxide or the pyridinium chlorochromate.</p> |
