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US 4,380,634 AGranted
Method of preparing 2-keto-4,6,8,8-tetramethyl-8,9-dihydro-2H-pyrano-(3,2-g) quinoline, a blue-green laser dye
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorRonald L. Atkins
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Abstract
A laser dye, 2-keto-4,6,8,8-tetramethyl-8,9-dihydro-2H-pyrano(3,2-g) quinoline, is prepared by mixing m-aminophenol and ethyl acetoacetate and heating the mixture.
Claims2
A method for preparing 2-keto-4,6,8,8-tetramethyl-8,9-dihydro-2H-pyrano(3,2-g) quinoline consisting of:
- mixing m-aminophenol and ethyl acetoacetate in the molar ratio of approximately 1:2 to form a mixture in the absence of a catalyst, or solvent;
- heating said mixture at 150.degree. C.;
- and
- filtering 2-keto-4,6,8,8-tetramethyl-8,9-dihydro-2H-pyrano(3,2-g) quinoline.
1 more element
Dependencies are inferred from the claim text.