Method for preparing spiro(indoline)-type photochromic compounds

Details Method for preparing spiro(indoline)-type photochromic compounds Method for preparing spiro(indoline)-type photochromic compounds

1985-09-03

1987-01-06

Raymond, Richard L.

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

Organic compounds

Chalcogen in the nitrogen containing substituent

546 15, 548409, C07D49110, C07D49800, C07D49810

Patent

active

046347674

ABSTRACT:
Spiro(indoline)-type photochromic compounds are prepared by admixing a solution of the Fischer's Base reactant in non-polar solvent with a mixture of the pyran- or oxazine-forming reactant, e.g., 5-nitroso-6-hydroxy quinoline, in polar solvent and heating the resulting reaction medium at temperatures sufficient to form the corresponding spiro(indoline)-type compound while simultaneously removing co-product water.

REFERENCES:
patent: 3562172 (1971-02-01), Ono et al.
patent: 3578602 (1971-05-01), Ono et al.
patent: 3671543 (1972-06-01), Koga et al.
patent: 3843550 (1974-10-01), Hinnen
patent: 3950356 (1976-04-01), Hinnen
patent: 4215010 (1980-07-01), Hovey et al.
patent: 4342668 (1982-08-01), Hovey et al.

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