Spiroindolinenaphthoxadine photochromic compounds

Details Spiroindolinenaphthoxadine photochromic compounds Spiroindolinenaphthoxadine photochromic compounds

1985-12-05

1987-01-13

Raymond, Richard L.

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

Organic compounds

Chalcogen in the nitrogen containing substituent

350354, C07D49810

Patent

active

046365613

ABSTRACT:
A photochromic compound represented by formula (I): ##STR1## wherein one of X.sub.1 and X.sub.2 represents a hydroxyl group, a sulfonic acid group or an alkali metal sulfonate base, and the other of X.sub.1 and X.sub.2 represents a hydrogen atom; X.sub.3 and X.sub.4 each represents a hydrogen atom, a lower alkyl group having from 1 to 3 carbon atoms, a lower alkoxy group having from 1 to 3 carbon atoms, a halogen atom, a nitro group or a cyano group; and R represents a straight chain alkyl group having from 1 to 30 carbon atoms. The compound exhibits excellent color developability.

REFERENCES:
patent: 3562172 (1971-02-01), Ono et al.
patent: 3578602 (1971-05-01), Ono et al.
patent: 4215010 (1980-07-01), Hovey et al.
patent: 4342668 (1982-08-01), Hovey et al.
Yoshihara et al, Chemical Abstracts, vol. 79, (1973), 20306p.

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