| 摘要 |
PURPOSE:To effectively produce a high-purity aluminum salt of N,N,N',N'- tetrakis(p-dialkylaminophenyl)-p-phenylenediamine by conducting a reaction in the presence of a specific solid catalyst. CONSTITUTION:A compd. of formula I (wherein R1 and R2 are each 2-6C alkyl provided that they may be the same or different) is reacted in the presence of a solid catalyst contg. at least one metal or metal oxide selected from the group consisting of silver, titanium, vanadium, iron, chromium, manganese, cobalt, nickel, an oxide of lead, and a platinum group metal and its oxide to give a near-infrared absorber of formula II (wherein R1 and R2 are as defined above; m is 1 or 2; and X is an anionic component e.g. chloride, bromide, perchlorate, nitrate, or hexafluoroantimonate). |
