| 摘要 |
NEW MATERIAL:A compd. of formula I [wherein R1-8 are each H, a phenyl or a furyl, provided that not all of them are H; M is H (or 2H), a metal, a metal (hydr)oxide, an acyl-, an alkoxy- or a siloxy-metal or a metal halide]. EXAMPLE:A compd. of formula II. USE:An optical recording medium, a photosensitive material for electrophotography and laser printing, an oxidation-reduction catalyst and a freshness retainer for flowers, cut flowers and foods. PREPARATION:2,3-Dicyanopyrazine of formula III (wherein Rx and Ry are each R1-8) or 1,3-diimino-2H-pyrrolo[3,4-b]-pyrazine which is a reation product of NH3 therewith is heated with a metal (oxide), a metal salt, a metal halide or nothing [wherein M is H (or 2H)] in an inert solvent with a high b.p. (e.g. dichlorobenzene). |
