| 摘要 |
<p>Cpd. of formula (I): (X is (a) an electron donating gp. such as OCH3, SCH3 -OC6H5, -SC6H5, -Cl, - Br, - I, - N(CH3)2 (b) a polycyclic aromatic gp. such as alpha- or beta-naphthyl anthracenyl or pyrenyl or (c) an alicylic gp. such as cyclohexyl or p-tertbutyl cyclohexyl, R1 is H or one or more electron donating gps. in posns. 4, 5, 6 and 7 , R2 is an electron accepting gp. R3 is an electron donating gp) are used in the optical recording of information, esp. using UV light.</p> |
