| abstract |
NEW MATERIAL:A dithienylmaleic anhydride derivative shown by formula I (R<1>-R<6> are alkyl). EXAMPLE:2,3-Di(2,3,5-trimethylthienyl)maleic anhydride. USE:A photochromic compound useful as optical memory material, various recording memory materials, copying material, sensitive material for printing, sensitized material for laser, sensitized material for photocomposition, optical filter, masking material, actinometer and display material. PREPARATION:For example, a 1,2-di(2,3,5-trialkylthienyl)-1,2-dicyanoethene shown by formula II is hydrolyzed into an acid anhydride to give a dithienylmaleic anhydride derivative shown by formula I. |