84-87-7

Usage

Preparation

After drying under vacuum, the resulting filter cake contains 1-naphthol-4-sulphonic acid in a yield of 92% of theory and <0.5% 1-naphthol-2-sulphonic acid and 3% of 1-naphthol-2,4-disulphonic acid based on the weight of 1-naphthol-4-sulphonic acid.

InChI:InChI=1/C10H8O4S/c11-9-5-6-10(15(12,13)14)8-4-2-1-3-7(8)9/h1-6,11H,(H,12,13,14)

Upstream product

• 90-15-3 α-naphthol 
• 84-86-6 4-amino-1-naphthalenesufonic acid 
• 6328-72-9 4-chloro-1-naphthylsulphonic acid 
• 172304-90-4 4-ethoxy-naphthalene-1-sulfonic acid 
• 4759-11-9 11-oxido-1,6-methano<10>annulene 
• 7664-93-9 sulfuric acid 
• 64-19-7 acetic acid 
• 7790-94-5 chlorosulfonic acid 
• 1857-16-5 4-hydroxy-naphthalene-1,3-disulfonic acid 
• 7732-18-5 water 
• 6036-06-2 sodium 4-aminonaphthalene-1-sulfonate tetrahydrate 
• 7782-99-2 sulphurous acid 
• 83702-86-7 4-sulfo-naphthalene-1-diazonium-betaine 
• 618-06-4 m-sulfanilic acid diazonium salt 

Downstream Products

• 23792-56-5 2-benzeneazo-1-naphthol-4-sulfonic acid 
• 10521-22-9 2-(p-methylophenylazo)-1-naphthol-4-sulfonic acid 
• 4620-74-0 2-(p-chlorophenylazo)-1-naphthol-4-sulfonic acid 
• 239-01-0 11H-benzo[a]carbazole 
• 2065-37-4 2-bromo-1,4-naphthoquinone 
• 13243-65-7 2,3-Dibromo-1,4-naphthoquinone 
• 605-69-6 1-hydroxy-2,4-dinitronaphthalene 
• 2066-93-5 3,4-dioxo-3,4-dihydro-naphthalene-1-sulfonic acid 
• 88-99-3 benzene-1,2-dicarboxylic acid 
• 114380-67-5 4-amino-3-(4-amino-phenyl)-naphthalene-1-sulfonic acid 
• 102768-77-4 4-phenylazo-naphthalene-1-sulfonic acid 
• 2653-70-5 1-phenylazonaphthalene 
• 132281-56-2 C₁₆H₁₀N₂O₈S₂^(2-)*2Na⁽¹⁺⁾ 
• 90-15-3 α-naphthol 

Relevant academic research and scientific papers

Process for aryl-quinone and aryl-naphthoquinone diazide sulfonic acids

A process for the preparation of aryl-diazide-sulfonic acids by a series of sequential in-situ process steps. The process comprises the nitrosation of a hydroxyarylsulfonic acid; conversion of the nitroso-derivative to a sulfamate which is then diazotized to the diazide. Temperature and pH are maintained in predetermined ranges to maintain the reaction products in solution without the formation side-products or the need to isolate intermediates. The process of the invention is particularly useful in the preparation of light-sensitive materials such as naphthoquinonediazide sulfonic acids which are used in the preparation of photoresist compositions. The invention provides a high purity product at a high material efficiency, high equipment utilization, low effluent discharge, and reduced cost.

Isomerization and Sulfodeprotonation in the Reaction of 1,6-Oxidoannulene, 1,6-Iminoannulene, Their Isomers 1-Naphthol and 1-Aminonaphthalene, and 11-Oxo-1,6-methanoannulene with SO3

The reactions of 1-naphthol (3), 1-aminonaphthalene (10), and 1,6-oxido- (1), 1,6-imino- (2), and 11-oxo-1,6-methanoannulene (15) with SO3 in aprotic solvents have been studied.With 3 the initial product is 1-naphthyl hydrogen sulfate (4), which is slowly converted into the 1-naphthol-2- (5) and -4-sulfonic acid (6) via O-desulfonation and C-sulfonation on using is less than or equal to 1 equiv of SO3, but via C-sulfonation and O-desulfonation if the SO3 is in a large excess.It is suggested that on using is less than or equal to 1 equiv of SO3 the conversion of 4 into the 2-sulfonic acid 5 proceeds intramolecularly.The annulene 1 with SO3 in dioxane initially yields 1-naphthol and its hydrogen sulfate (4), which at temperatures >-30 deg C undergo ring sulfonation (vide supra).The nitrogen-containing substrates behave quite similarly to their oxygen analogues in that both 10 and 2 yield 10-2-SO3H, 10-4-SO3H, and 10-2,4-(SO3H)2.With 2, the initial product is the N-sulfonic acid 9.The ketone 15 undergoes ring substition with formation of the 2-sulfonic and 2,7-disulfonic acids.Mechanisms have been presented to rationalize the skeletal rearrangements of the annulenes 1 and 2.

Method for producing 1-naphthol-4-sulphonic acid

Disclosed is a method for producing 1-naphthol-4-sulphonic acid in free acid form and contaminated with less than 2% by weight of the isomeric 1-naphthol-2-sulphonic acid.

Aromatic azo sulfonylnitrene compounds

Compounds of the structure SPC1 Wherein R and R1 are the same or different and are selected from the group consisting of hydrogen, halogen, and alkyl from one to four carbon atoms, inclusive, and R2 is a substance which inhibits thrombogenic or clotting activity of a material and is that portion of a substituted aromatic which couples with a diazonium salt.