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Leon Lilienfeld
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Organic Low-Molecular-Weight Compounds And Preparation Thereof
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Abstract
10,925. Lilienfeld, L. May 12. Dyes, artificial.-Indigo or its homologues or derivatives are produced by heating aromatic glycines or their homologues or derivatives with caustic alkalies in the presence of suitable condensing-agents, and either in vacuo, or when passing over, into, or through the mass a neutral or reducing gas. Suitable gases are ammonia, nitrogen, hydrogen, illuminating - gas, benzene, or ligroin. Suitable condensing-agents are alkali or alkaline-earth metals, magnesium, or alloys, oxides, or other compounds.
GB190410925D1904-05-121904-05-12Improvements in the Manufacture and Production of Indigo or Homologues or Derivatives thereof.
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