Abstract: Described are novel reversible photochromic naphthopyran compounds substituted at the number eight carbon atom on the naphtho portion of the naphthopyran ring with, for example, a methoxy group. Also described are polymeric organic host materials that contain or that are coated with such compounds. Optically clear articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds or combinations thereof with complementary photochromic compounds, e.g., certain spiro(indoline)type compounds, are also described.

Abstract: Described are novel reversible photochromic naphthopyran compounds, examples of which are compounds having certain substituents at the number 5 and 6 carbon atoms 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 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.

Abstract: Described are novel reversible photochromic diaryl-3H-naphtho[2,1-b]pyran compounds having a substituted or unsubstituted, five or six member heterocyclic ring fused to the g, i, or l side of the naphthopyran. The heterocyclic ring contains an oxygen or nitrogen atom and is attached to the number 5, 6, 7, 8, 9, or 10 carbon atom of the naphtho portion of the naphthopyran. Also described are organic host materials containing 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)oxazine-type compounds, are also described.

Abstract: Described are novel reversible photochromic naphthopyran compounds, examples of which are compounds substituted at the 3 position of the pyran ring with (i) an aryl substituent and (ii) a phenyl substituent having a 5- or 6-member heterocyclic ring fused at the number 3 and 4 carbon atoms of the phenyl substituent, and at the 6 position of the naphthyl portion of the naphthopyran compound with a nitrogen-containing heterocyclic ring. 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.

Abstract: Described are novel reversible photochromic phenanthropyran compounds, examples of which are substituted 2H-phenanthro 4,3-b!pyran and 3H-phenanthro 1,2-b!pyran compounds. The 2H-phenanthropyran compounds have certain substituents at the number 5 and 6 carbon atoms of the phenanthro portion of the phenanthropyran and at the 2 position of the pyran ring. Certain substituents may also be present at the number 7, 8, 9, 10, 11, or 12 carbon atoms of the phenanthro portion of the phenanthropyran. The 3H-phenanthropyran compounds have certain substituents at the number 11 and 12 carbon atoms of the phenanthro portion of the phenanthropyran and at the 3 position of the pyran ring. Certain substituents may also be present at the number 5, 6, 7, 8, 9, or 10 carbon atoms of the phenanthro portion of the phenanthropyran. Also described are polymeric organic host materials that contain or that are coated with such compounds.

Abstract: Described are novel reversible photochromic naphthopyran compounds which have two phenyl moieties adjacent to each oxygen of each pyran ring. The substituents on each pair of phenyl moieties mirror one another when the phenyl groups are substituted. The naphthodipyrans are prepared from .beta.,.beta.-dihydroxynaphthalene compounds.

Abstract: Described are novel reversible photochromic naphthopyran compounds, examples of which are compounds substituted at the 3 position of the pyran ring with (i) an aryl substituent and (ii) a phenyl substituent having a 5- or 6-member heterocyclic ring fused at the number 3 and 4 carbon atoms of the phenyl substituent. 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.

Abstract: Described are novel reversible photochromic naphthopyran compounds, examples of which are compounds having certain substituents at the number 5 and 6 carbon atoms 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 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.

Abstract: Described are novel reversible photochromic diaryl-3H-naphtho[2,1-b]pyran compounds having a substituted or unsubstituted, five or six member heterocyclic ring fused to the g, i, or l side of the naphthopyran. The heterocyclic ring contains an oxygen or nitrogen atom and is attached to the number 5, 6, 7, 8, 9, or 10 carbon atom of the naphtho portion of the naphthopyran. Also described are organic host materials containing 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)oxazine-type compounds, are also described.

Abstract: A novel photochromic spironaphthopyran composition having the general structural formula: ##STR1## in which phenyl substituents positioned adjacent to the oxygen of the pyran ring are linked at their adjacent ortho positions by the functionality (R).sub.n wherein n is the integer 0-2 and wherein R is methylene (--CH.sub.2 --), vinylene (--C.dbd.C--), or a carbon-carbon bond, i.e., when n is 0. The groups R.sub.1 and R.sub.5 -R.sub.10 may be hydrogen or a variety of substituents.

Abstract: Described are novel reversible photochromic naphthopyran compounds, examples of which are compounds substituted at the 3 position of the pyran ring with (i) an aryl substituent and (ii) a phenyl substituent having a 5- or 6-member heterocyclic ring fused at the number 3 and 4 carbon atoms of the phenyl substituent. 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.

Abstract: Described are novel reversible photochromic naphthopyran compounds substituted at the number eight carbon atom on the naphtho portion of the naphthopyran ring with, for example, a methoxy group. 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 are also described.

Abstract: Described are novel reversible photochromic naphthopyran compounds substituted at the number eight carbon atom on the naphtho portion of the naphthopyran ring with, for example, a methoxy group. 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 are also described.

Abstract: Described are spirobenzoxazine pyrrolo pyridine compounds. Also described is the use of such compounds as photochromic substances in organic host materials such as an organic transparent plastic material, e.g., an ophthalmic lens, to impart a photochromic response thereto.