4-amino-1,1'-azonaphthalene

Preparation

Naphthalen-1-amine diazotization, and Naphthalen-1-amine coupling.

Properties and Applications

dark red light orange and brown. Soluble in ethanol, acetone and benzene. In concentrated sulfuric acid to red light brown, dilution after dark yellow, red brown precipitation; In concentrated sodium hydroxide solution insoluble. Used for oil, paraffin wax, cellulose and synthetic resin paint color.

Standard	Light Fastness	Heat-resistant(℃)		water	Sodium Carbonate(5%)	Hydrochloric acid(5%)
		Melting point	Stable
ISO	Poor	140-152	100≥ 100 Sublimation	Insoluble	No change	Turned purple