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They are produced on a large scale by condensation of naphthalenesulfonate or alkylnaphthalenesulfonates with formaldehyde. [1] [2] Examples include: amaranth dye; amido black; armstrong's acid; congo red; Evans blue; suramin; trypan blue
2-Naphthalenesulfonic acid, sodium salt, polymer with formaldehyde: Identifiers; IUPAC name. Sodium 2-naphthalenesulfonate, polymer with formaldehyde. CAS Number ...
Naphthalene-2-sulfonic acid undergoes many reactions, some of which are or were of commercial interest. Fusion with sodium hydroxide followed by acidification gives 2-naphthol. It is an intermediate in the formation of 2,6-, 2,7- and 1,6-naphthalene disulfonic acids as well as 1,3,6-naphthalenetrisulfonic acid.
Some naphthalenesulfonate polymers are superplasticizers used for the production of high strength concrete as well as water reducers in the production of gypsum wallboard. [33] They are produced by treating naphthalenesulfonic acid with formaldehyde , followed by neutralization with sodium hydroxide or calcium hydroxide .
Aminonaphthalenesulfonic acids are compounds with the composition C 10 H 6 (NH 2)(SO 3 H), being derived from naphthalene (C 10 H 8) substituted by an amino and sulfonic acid groups. These compounds are colorless solids.
On the occasion of the 10th anniversary of the Frida relaunch in the U.S., CEO Chelsea Hirschhorn looks back at the "blind naivete" that let her believe the snotsucker could go mainstream.
For reference, a half-cup serving of canned tomatoes packed in tomato juice with no added salt has just 20 calories and provides 2 grams of fiber, 1 gram of protein, 12 milligrams of sodium and 3 ...
It is usually supplied as its red sodium salt but can also be used as the calcium and potassium salts. These salts are soluble in water. In solution, its maximum absorbance lies at about 504 nm. [3]: 921 Allura Red AC is manufactured by azo coupling between diazotized 5-amino-4-methoxy-2-toluenesulfonic acid and 6-hydroxy-2-naphthalene sulfonic ...