| abstract |
NEW MATERIAL: A compd. represented by formula I (wherein R 1 is H, an optionally substd. 1-28C alkyl optionally interrupted by at least one 0, optionally substd. 3-7C cycloalkyl; R 2 is H, Cl, Br, or a 1-6C alkyl; Y is a group represented by formula II or III; Z 1 and Z 2 are each H or they combine with each other to form a 2-3C alkylene optionally substd. by a 1-4C alkyl; X - is an anion; and rings A and B are each optionally substd. and may each be fused with a benzene ring). n EXAMPLE: A compd. represented by formula IV. n USE: An optical recording medium exhibiting a high absorption at a wavelength of a semiconductor laser. n PROCESS: A cycloammonium compd. represented by formula V or VI or a quinoxaline compd. represented by formula VII is condensed with a compd. represented by formula VIII or IX in an inert solvent (e.g. ethanol) at 20-140°C, if necessary in the presence of a basic catalyst (e.g. triethylamine). n COPYRIGHT: (C)1991,JPO |