Cyclobutenedione derivative, process for preparing the same, and

Details Cyclobutenedione derivative, process for preparing the same, and Cyclobutenedione derivative, process for preparing the same, and

1997-09-30

1999-02-16

Gupta, Yogendra N.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

252587, C07C21149

Patent

active

058722564

ABSTRACT:
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: ##STR1## wherein R.sup.1 and R.sup.2 each represents an alkyl group, an alkenyl group or an alkynyl group; R.sup.3 and R.sup.4 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 R.sup.1, R.sup.2 and the nitrogen atom to which they are connected may form a cyclic structure larger than 3-membered ring, R.sup.1 and R.sup.3, and R.sup.2 and R.sup.4 each may be connected to each other to form a methylene chain --(CH.sub.2).sub.2 --, and the hydrogen atoms in R.sup.1 and R.sup.2 may be substituted by halogen atom, alkyloxy group or cyano group.

REFERENCES:
patent: 4986935 (1991-01-01), Ageishi et al.
patent: 5106997 (1992-04-01), Pu
patent: 5210302 (1993-05-01), Pu

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