A new method for the preparation of naphtazarins

✍ Scribed by F. Farina; M. Lora-Tamayo; C. Suarez

• Publisher: Elsevier Science
• Year: 1959
• Tongue: French
• Weight: 192 KB
• Volume: 1
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(01)99471-7

✦ Synopsis

de Quimica ARONG quinone pigments, the derivatives of naphtazarin (3,&dihydroxyl,&naphtoquinone) present a special interest, not only because they are important natural products, the structure of which has not been elucidated in many cases, but also because they have been employed as colouring matter for industrial application.

The methods of synthesis of naphtazarin derivatives are not, however, very satisfactory. Roussin' obtained naphtazarin for the first time by the action of fuming sulphuric acid and a reducing agent on the 1,5dinitronaphtelene, but the method was not applied to the homologues until Bruce and Thomson,' who obtained in low yield 2-methylnaphtazarin, 2,6dimethylnaphtazarin and 2,6-dichloronaphtazarin starting with the 1 Z. Roussin,