Synthesis and Properties of Photochromic 6-Chloro-8-bromo-spiro(indoline-2,2'[2H]benzopyran) Compounds
TAN Ting-Feng1,2, HAN Jie1, PANG Mei-Li1, GAO Yong-Bin1, MENG Ji-Ben1
Chem. J. Chinese Universities . 2007, (3): 472 -475 .