| 摘要 |
<p>NEW MATERIAL:Naphthalocyanine compounds of formula I , wherein R1, R2, R3, R4 are each a 5-12C alkyl; M is metal, metal oxide, metal halide with the proviso that when any of R1-R4 is 5C alkyl, the case where M is VO is excluded. EXAMPLE:Tetra-t-amylcopper naphthalocyanine. USE:Near infrared ray-absorbing dyes for use in dyeing or coloring optical recording medium, liquid crystal display apparatus, optical filter, or resins. PREPARATION:A 2,3-dicyanonaphthalene of formula II (wherein R6 is a 5-12C alkyl) is reacted with a metal chloride by heating in the presence of urea.</p> |
