| 摘要 |
NEW MATERIAL:The compound of formula I (R<1> is H, halogen, 1-13C alkyl or alkoxy; R<2> is H or 1-13C alkoxy; R<3> is H or 1-13C alkyl; at least one of R<1>-R<3> is above alkyl or alkoxy). USE:A charge-generation agent for electrophotography, a laser radiation absorbing material for laser-writing liquid crystal display and recording material for optical disk. It is soluble in a wide variety of solvents, gives a solution having an absorption peak wavelength of 800-900nm and has high resistance to light. PREPARATION:The compound of formula I can be produced by reacting the benz[a]azulene derivative of formula II with 3,4-dihydroxy-3-cyclobutene-1,2-dione (squaric acid) in a solvent such as alcohol, a mixture of alcohol and aromatic hydrocarbon, etc., at 90-120 deg.C. |
