methin and azomethinfarbstoffe based on naphthochinonen in non-linear optics

摘要

PCT No. PCT/EP95/02328 Sec. 371 Date Dec. 24, 1996 Sec. 102(e) Date Dec. 24, 1996 PCT Filed Jun. 16, 1995 PCT Pub. No. WO96/00409 PCT Pub. Date Jan. 4, 1996Naphthalene derivatives of the formula IMAGE where the rings A and B may be benzofused, X is nitrogen or a radical of the formula CH or CH=CH-CH, Z is a heterocyclic radical or additionally, when x is CH=CH-CH, a 5- or 6-membered aromatic carbocyclic radical, and R1, R2 and R3 are hydrogen, C1-C4-alkyl or C5-C7-cycloalkyl, are useful in nonlinear optics.