23242-84-4Relevant articles and documents
INDOLONAPHTHOPYRANS
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Paragraph 0097, (2020/07/14)
Provided is a photochromic indolenaphthopyran compound having the skeletal structure of Formula (I): wherein R1 and R2 each independently have a steric bulk A, wherein at least one of R1 or R2 has a steric bulk A of at least 0.6, R3 and R4 each independently have a Hammett σρ value, and wherein the indolenaphthopyran compound has a calculated electronic steric factor of at least -3.3.
NOVEL PHOTOCHROMIC INDENO-FUSED NAPHTHOPYRANS
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Page 12, (2008/06/13)
Described are novel photochromic indeno-fused naphthopyran compounds, examples of which are naphthopyran compounds having a substituted or unsubstituted indeno group, the 2,1 positions of which are fused to the f side of the naphtho portion of the naphtho
Photochromic substituted naphthopyrans
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, (2008/06/13)
Described are novel reversible photochromic 2H-naphtho[1,2-b]pyran compounds, examples of which are compounds having certain substituents at the number 5 carbon atom of the naphtho portion of the naphthopyran and at the 2-position of the pyran ring. Certain substituents may also be present at the number 6, 7, 8, 9 or 10 carbon atoms of the naphtho portion of the naphthopyran. Also described are organic host materials that contain or that are coated with such compounds. Articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds or combinations thereof with complementary photochromic compounds, e.g., spiro(indoline) type compounds, are also described.
