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

1995-04-14

1997-04-01

Wilson, D. R.

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

Organic compounds

Amino nitrogen containing

359328, C07C21116

Patent

active

056168020

ABSTRACT:
The present invention provides a novel chemical substance for practical organic nonlinear optical element having a great nonlinear optical effect, an excellent chemical and thermal stability and transparency which can easily undergo crystalline growth from a liquid phase or melt phase and can be easily worked, a process for the preparation thereof, and a nonlinear optical element prepared from such a material. 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 X.sup.1 represents a halogen atom; X.sup.2, X.sup.3, X.sup.4 and X.sup.5 each represent a hydrogen atom or a halogen atom; and R represents a substituent represented by the following formula: ##STR2## wherein C* represents an asymmetric carbon atom.

REFERENCES:
patent: 4986935 (1991-01-01), Ageishi et al.
patent: 5106997 (1992-04-01), Pu
patent: 5210302 (1993-05-01), Pu
The America Physical Society 1991, Physical Review Letters, "Hyper-Rayleigh Scattering in Solution", Jun. 10, 1991, vol. 66, No. 23, Koen Clays et al. pp. 2980-2983.

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