| 摘要 |
NEW MATERIAL:The compound of formula I (R<1> is 1-20C alkyl or aralkyl; R<2> to R5 are H, 1-6C alkyl, aryl, aralkyl, 1-5C alkoxy, halogen, cyano, trichloromethyl, trifluoromethyl or nitro; R<6> and R<7> are H, 1-6C alkyl, aryl, aralkyl, halogen, cyano or nitro; X is O or S). EXAMPLE:3-Isopropyl-8'-methacryloxymethyl-6'-nitro-1-selenaspiro-[2H-1'- benzopyran-2,2'-benzoselenazoline] of formula II. USE:A high-density optical recording material, an optical filter, an image-forming material, a photo-sensitive material, a non-linear optical element, etc. PREPARATION:A quaternary benzoselenazolium salt derivative of formula III [A is halogen or R<8>SO3(R<8> is lower alkyl, etc.)] is condensed with a 3- methacryloxymethyl-5-nitrobenzaldehyde derivative of formula IV in the presence of an amine catalyst. |
