| 摘要 |
A novel cyclobutenedione derivative prepared in accordance with the following reaction formula, a process for the preparation thereof, and a nonlinear optical element comprising such a derivative are provided: <IMAGE> <IMAGE> +TR <IMAGE> wherein R1 and R2 each represents an alkyl group, an alkenyl group or an alkynyl group; R3 and R4 each represents a hydrogen atom, an alkyl group, an alkenyl group or an alkynyl group; and C* represents an asymmetric carbon atom, with the proviso that R1, R2 and the nitrogen atom to which they are connected may form a cyclic structure larger than 3-membered ring, R1 and R3, and R2 and R4 each may be connected to each other to form a methylene chain -(CH2)n-, and the hydrogen atoms in R1 and R2 may be substituted by halogen atom, alkyloxy group or cyano group.
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