Pararosaniline

• Pararosaniline
• 4,4 ' - (4- Iminocyclohexa -2, 5 - dienylidenemethylene ) dianiline hydrochloride
• C. I. Basic Red 9

Greenish solid

Fixed

268-270 ° C ( decomposition)

10 g · l-1

Risk

Template: Infobox chemical / molecular formula search available

Parafuchsin is a chemical compound. It is found in commercially available red triphenylmethane magenta, which is dissolved in ethanol was used in microscopy and histology of the dyeing. Parafuchsine and fuchsin differ in a methyl group and are thus homologous.

Production and representation

Parafuchsin arises when displaying magenta as an impurity. Thereby fuchsin by reaction of 4- aminobenzaldehyde, 4 - aminobenzyl alcohol or 4,4 '-diaminodiphenylmethane with an aniline in the presence of oxidizing agents, and iron ( II) chloride is prepared.

Properties

The molecule represents a resonance-stabilized cations, with the characteristics of a cyanine dye. This explains the intense colors of the commercially available fuchsin ( contaminated with parafuchsine ). Alcoholic fuchsin solutions possess an anomalous dispersion.