| 摘要 |
A spiro-oxazine compound of the formula (A): …<CHEM>… wherein R<1>, R<2>, R<3>, R<4>, R<5>, R<6> and R<7> independently represent hydrogen, (C1 or 2) alkyl, halogenated C1-2 alkyl, C1-2 alkoxy, halogen or nitro, R is unsubstituted or substituted phenyl or naphthyl, and n is 1 to 5, is valuable as a photochromic material and exhibits enhanced fatigue resistance in photocolorability. …<??>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:… &lparstr& CH2 &rparstr& @ R… in the nitrogen atom of the indoline nucleus, with an alpha -nitroso- beta -naphthol. |
