Naphthopyran derivatives are known for their photochromic behavior. Photochromism refers to the reversible transformation of a compound between two forms with distinct absorption spectra, induced by exposure to light, especially ultraviolet (UV) light. Naphthopyran derivatives can switch between a colored, open-ring isomer and a colorless, closed-ring isomer upon UV light exposure. This property has applications in photochromic materials for eyeglasses, optical filters, and data storage devices.
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3H-Naphtho[2,1-b]pyran, 8-ethynyl-3,3-diphenyl-
Spiro[2H-indole-2,3'-[3H]naphth[2,1-b][1,4]oxazine], 1,3-dihydro-1,3,3-trimethyl-5-nitro-
