| 摘要 |
NEW MATERIAL:A squarylium compound shown by the formula I [A is group shown by the formula II (ring C is heterocyclic ring containing 1-2 N, O or S; R<1> and R<2> are H, alkyl, etc.; B is group shown by the formula III (ring C' is heterocyclic ring containing 1-2 N, or O or S; R<1>' and R<2>' are H, alkyl, etc.), etc.]. EXAMPLE:A compound shown by the formula VII (not showing melting point at <=300 deg.C, having the 775nm maximum absorption wavelength of absorption spectrum in its chloroform solution). USE:Various information material, etc., using laser beam. PREPARATION:Azulene derivatives shown by the formulas IV and V are reacted with squalic acid in a solvent. |
