An optically anisotropic element comprises a discotic compound. The discotic compound has an oriented discotic plane. The discotic compound has a molecular structure including a discotic core and 3 to 20 combinations of ester bonds (--O--CO--) and 1- or 2-alkenyl groups. The alkenyl group can have a polymerizable group as a substituent group positioned at the terminal. A polymerizable discotic compound having an oriented discotic plane can be polymerized to form an optically anisotropic element. Alignment of the oriented discotic plane is fixed by polymerization. A new triphenylene compound is also disclosed.

 
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