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ChemicalBook CAS DataBase List 1-Naphthylamine-4,6,8-trisulfonic acid
17894-99-4

1-Naphthylamine-4,6,8-trisulfonic acid synthesis

2synthesis methods
Naphthalene is sulfonated under conditions that maximize formation of the 1,3,5-trisulfonic acid, followed by nitration with H2SO4– HNO3 in situ at 35℃. After quenching, neutralization with calcium carbonate, and reduction of the nitro-derivative with iron under acid conditions, the byproduct 1- aminonaphthalene-3,6,8-trisulfonic acid (18 % yield) is selectively precipitated by acidification. The desired isomer is then precipitated by further acidification and salting of the filtrates, and finally purified by reprecipitation. Overall yield is 25 – 30 %.
-

Yield:-

Steps:

Multi-step reaction with 2 steps
1: H2SO4; HNO3 / Isolierung als Kalium-Salz
2: nickel / Hydrogenation

References:

Allisson et al. [Helvetica Chimica Acta,1952,vol. 35,p. 2139,2144]

FullText

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