| 摘要 |
NEW MATERIAL:The compound of formula I (R<1> and R<2> are 1-13C alkyl or R<1> and R<2> together form cycloalkylene; R<3> is H or 1-13C alkyl). EXAMPLE:The compound of formula II. USE:The absorption peak wavelength of the visible light absorption spectrum of the compound in solution is within the range of 700-800nm. The compound has high light resistance, is soluble in a hydrogen halide-containing solvent, ether solvent, ester solvent, aromatic hydrocarbon solvent, amide solvent, alcohol solvent, etc., and is expected to be useful in the field of various information materials using laser beam as a light source such as various electrophotographic materials, recording materials for optical disk, infrared cut filter, etc. PREPARATION:The compound of formula I can be produced by reacting the compound of formula III such as 1,2-trimethylene-5-isopropylazulene with 3,4- dihydroxy-3-cyclobutene-1,2-dione of formula IV in a solvent at 70-150 deg.C. |
