| 摘要 |
NEW MATERIAL:Compds. of formula I [wherein R<1> is an (alkoxy-substd.) 1-5C alkyl; R<2> is a 1-4C alkyl or a (1-4C alkyl-substd.) phenyl; R<3> and R<4> are each an (alkoxy- or halogen-substd.) 1-4C alkyl, a (1-4C alkyl-substd.) benzyl, a 5-7C cycloalkyl or a (1-4C alkyl- or halogen-substd.) phenyl; and X is H or a 1-4C alkyl]. EXAMPLE:Compd. of formula II. USE:Azaphthalide compds. which rapidly form a bluish green color with a developer, give an image having excellent resistance to light and moisture, are useful as color formers for color forming recording materials, have absorption bands in the region of wavelengths of 600-700nm, neither sublime nor cause spontaneous color formation and are colorless and stable. PREPARATION:An indole derivative of formula III is reacted with a quinolinic anhydride of formula IV in the presence or absence of a catalyst. The resulting pyridine carboxylic acid of formula V is reacted with an aniline derivative of formula VI in the presence of a dehydrating agent such as acetic anhydride, sulfuric acid, etc. The resulting product is purified. |
