abstract |
CYCLOHEXADIENE COMPOUNDS, OF WHICH THE FOLLOWING IS EXEMPLARY. 1,4-BIS(C6H5-),1-OH,2,2,3-TRI(NC-)-XANTHEN-9-ONE THESE COMPOUNDS ARE PHOTOCHROMIC AND MAY BE USED IN INFORMATION DISPLAY OR RECORDING, AND IN OTHER OPTICAL APPLICATIONS SUCH AS LIGHT FILTERING. |