Blue 3H-naphtho[2,1-b]pyran compounds and use thereof in...

Details Blue 3H-naphtho[2,1-b]pyran compounds and use thereof in... Blue 3H-naphtho[2,1-b]pyran compounds and use thereof in...

2007-06-12

2007-06-12

Solola, Taofiq (Department: 1625)

Drug, bio-affecting and body treating compositions

Designated organic active ingredient containing

Heterocyclic carbon compounds containing a hetero ring...

C514S232800, C544S099000, C546S043000, C546S095000

Reexamination Certificate

active

10945443

ABSTRACT:
Photochromic 3H-naphtho[2,1-b]pyran compounds corresponding to formula Iin which the groups R1to R7and B′ have defined meanings and the use of such photochromic compounds in synthetic resin articles of all types, particularly for ophthalmic purposes. The photochromic 3H-naphtho[2,1-b]pyran derivatives have particularly long-waved absorption maxima in the open form, and when used in photochromic eyeglass lenses, produce essentially blue color tones which have a high darkening capacity.

REFERENCES:
patent: 4818096 (1989-04-01), Trudle et al.
patent: 5990305 (1999-11-01), Melzig et al.
Demadrille et al., entitled “1H and 13C NMR chemical shift assignment of some 3H-Naphtho ′2,1-b!pyrans”, Magnetic Resonance Chemistry, vol. 37, 1999, pp. 328-330.

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