Acid Red 73

ChEBI: An organic sodium salt that is the disodium salt of 7-hydroxy-8-{[4-(phenyldiazenyl)phenyl]diazenyl}naphthalene-1,3-disulfonic acid. Occasionally used for the demonstration of muscle fibres in conjunction with, or as a replacement for, acid fuchsin.

Woodstain scarlet is an organic sodium salt that is the disodium salt of 7-hydroxy-8-{[4-(phenyldiazenyl)phenyl]diazenyl}naphthalene-1,3-disulfonic acid. Occasionally used for the demonstration of muscle fibres in conjunction with, or as a replacement for, acid fuchsin. It has a role as a histological dye. It contains a 7-hydroxy-8-{[4-(phenyldiazenyl)phenyl]diazenyl}naphthalene-1,3-disulfonate.

It is obtained by diazotizing p-aminoazobenzene, coupling with G salt, and salting out. 1. Diazotization: Add 240kg of p-aminoazobenzene hydrochloride to 1200L of water, and add 200kg of 30% hydrochloric acid. Stir for 4 hours, cool to 8°C, add 30% sodium nitrite solution (100% 80 kg) from below the liquid surface within 3 hours, the temperature does not exceed 15°C, with a slight excess of nitrous acid as the end point, keep it for 1 hour, add ice cooling to 5 Below ℃, filter, discard the filter residue, add salt to the filtrate by volume 28%, stir for 20min, filter, the filter cake is diluted with water and ice to 3000L, the temperature is 0-5℃. 2. Coupling Put 1500L of water and 160kg of soda ash in the barrel, stir, add 270kg of G salt to make it completely dissolved. Cool to 5°C, add the above-mentioned diazonium liquid within 3h, and the temperature should not exceed 12°C. After the addition, the pH should be 9 and the G salt is excessive. After stirring for 6 hours, the temperature was raised to 60°C, salt was added by 9% by volume, filtered, and dried to obtain 680 kg of the original dye. After standardization, the finished dye is 1000kg. G salt (100%) 280 sodium nitrite (98%) 82 p-aminoazobenzene (100%) 248 hydrochloric acid (31%) 196 sodium carbonate (98%) 157 yuan Ming powder 160

Mainly used for dyeing wool, silk fabrics, paper and leather, but also for coloring plastics, anodized aluminum and cement

Molecular Weight:556.5
Hydrogen Bond Donor Count:1
Hydrogen Bond Acceptor Count:11
Rotatable Bond Count:4
Exact Mass:556.00992971
Monoisotopic Mass:556.00992971
Topological Polar Surface Area:201
Heavy Atom Count:37
Complexity:952
Covalently-Bonded Unit Count:3
Compound Is Canonicalized:Yes