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It is used as a chemical and organic intermediates.
Niefang Yu; Line Bourel; Benoit Deprez; Jean-Claude Gesquiere. Lewis acid-induced reaction of homophthalic anhydride with imines: a convenient synthesis of trans-isoquinolonic acids. Tetrahedron Letters. 1998, 39 (8), 829-832.
Yasumitsu Tamura; Manabu Sasho; Kiyomi Nakagawa; Teruhisa Tsugoshi; Yasuyuki Kita. Strong base induced cycloaddition of homophthalic anhydrides leading to peri-hydroxy polycyclic compounds. J. Org. Chem. 1984, 49, (3), 473-478.
Can behave, in its tautomeric o-quinonoid form, as a diene in the Diels-Alder reaction, giving, e.g. with quinones, useful yields of functionalized linear polycyclic systems of potential applicability in anthracyclinone synthesis: Tetrahedron Lett., 22, 4283 (1981); J. Org. Chem., 47, 4376 (1982):
Hazard Statements: H315-H319-H335
Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.
Precautionary Statements: P261-P280a-P305+P351+P338-P304+P340-P405-P501a
Avoid breathing dust/fume/gas/mist/vapours/spray. Wear protective gloves and eye/face protection. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.