Spiro-oxazine compound

Details Spiro-oxazine compound Spiro-oxazine compound

1993-03-29

1994-12-20

Rizzo, Nicholas

Organic compounds -- part of the class 532-570 series

Organic compounds

Chalcogen in the nitrogen containing substituent

544 70, C07D49110

Patent

active

053747232

ABSTRACT:
A spiro-oxazine compound represented by the following general formula (A) or (A') is a photochromic compound having an excellent fatigue resistance to repetition of coloration and decoloration and an abundance of hues: ##STR1## wherein the .alpha. ring is a ring selected from a 5-membered ring having one N atom, which may be connected to a benzene ring or naphthalene ring, and a 6-membered ring having one N atom, with the proviso that the N atom in the .alpha.ring is bonded to a C.sub.1-20 alkyl or another organic group, X is selected from O, S, Se and N--R.sup.1 (in which R.sup.1 is selected from H, and C.sub.1-20 alkyl and other organic groups), R.sup.2 and R.sup.3 are selected from --OH, amino, C.sub.1-20 alkoxy, halogen, and other groups, and k is an integer of 0 to 2.

REFERENCES:
patent: 4634767 (1987-01-01), Hoelscher et al.
patent: 5166345 (1992-11-01), Akashi et al.
Glenn H. Brown, Photochromism, vol. III, Techniques of Chemistry, Wiley Interscience, New York, 1971.

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