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1. (WO2001002384) SPIROFLUORENOPYRANS

Pub. No.:    WO/2001/002384    International Application No.:    PCT/EP2000/006156
Publication Date: Fri Jan 12 00:59:59 CET 2001 International Filing Date: Sat Jul 01 01:59:59 CEST 2000
IPC: C07D 311/96
C07D 493/10
C07D 495/10
G02B 5/23
Applicants: OPTISCHE WERKE G. RODENSTOCK
MANN, Claudia
MELZIG, Manfred
WEIGAND, Udo
Inventors: MANN, Claudia
MELZIG, Manfred
WEIGAND, Udo
Title: SPIROFLUORENOPYRANS
Abstract:
The invention relates to specific photochromic 3H-naphtho[2,1-b]-pyran derivatives and to their use in all types of plastics, especially for ophthalmic purposes. In particular, the invention relates to spiro compounds with a fluorene structure that are derived from naphthopyrans, so called spirofluorenopyrans, in which an anellated ring system is bonded to the central carbon atom of the fluorene structure by a spiro bond.