83-56-7

Usage

Uses

Used in Dye Industry:
1,5-Dihydroxy naphthalene is used as an intermediate for the synthesis of mordant azo dyes, which are essential for producing a wide range of vibrant and colorfast dyes used in textiles, plastics, and other materials.
Used in Organic Synthesis:
1,5-Dihydroxy naphthalene is utilized as a key building block in the synthesis of various organic compounds, including pharmaceuticals, agrochemicals, and other specialty chemicals. Its unique structure allows for a variety of chemical reactions, making it a versatile component in organic synthesis.
Used in Pharmaceutical Industry:
As an intermediate in the synthesis of pharmaceuticals, 1,5-Dihydroxy naphthalene plays a significant role in the development of new drugs and therapeutic agents. Its chemical properties enable the creation of novel molecular structures with potential medicinal applications.
Used in Photographic Industry:
1,5-Dihydroxy naphthalene is employed in the photographic industry as a component in the development of photographic films and papers. Its chemical properties contribute to the formation of stable images and enhance the overall quality of photographic products.

Purification Methods

The diol (~30g) is purified by making into a thick paste with H2O and suspending this in 3L of H2O containing 200mL of EtOH, boiling under reflux for 3hours, cooling to 30o, saturating with SO2, digesting below the boiling point for 1hour and filtering fast through a large hot filter paper. The hot filtrate is poured onto crushed ice whereby the diol (15-20g) separates as colourless needles (m 258o) [Wheeler & Ergle J Am Chem Soc 52 4873 1930]. Recrystallise it from H2O or nitromethane under N2 to avoid oxidation. The dibenzoyl derivative has m 245o (from EtOH). The 5-methoxy-1-naphthol derivative [prepared from the diol in MeOH/HCl (1:30 weight to volume ratio) and set aside at 25o for 9-10days] crystallised from pet ether (m 135-136o) or from CH2Cl2/hexane (needles m 140o) [Bell & McCaffrey Aust J Chem 46 731 1993]. [Beilstein 6 I 477, 6 II 950, 6 III 5265, 6 IV 6554.]

InChI:InChI=1/C10H8O2/c11-9-5-1-3-7-8(9)4-2-6-10(7)12/h1-6,11-12H

Synthetic route

1,5-diacetoxynaphthalene (605-89-0) → 1,5-dihydroxynaphthalene (83-56-7) + 5-hydroxynaphthalen-1-yl acetate (94807-85-9)

Conditions	Yield
With lipase of Pseudomonas sp; water In various solvent(s) at 25℃; for 2.5h; Hydrolysis; deacetylation;	A 60% B 40%

1,5-dimethoxynaphthalene (10075-63-5) → 5-methoxynaphthalen-1-ol (3588-80-5) + 1,5-dihydroxynaphthalene (83-56-7)

Conditions	Yield
With Cyclohexyl iodide In N,N-dimethyl-formamide for 2.5h; Heating;	A 43% B 44%

α-naphthol (90-15-3) → 1,7-Dihydroxynaphthalene (575-38-2) + 1,5-dihydroxynaphthalene (83-56-7)

Conditions	Yield
With dihydrogen peroxide; hydrogen fluoride; antimony pentafluoride at -20℃; for 0.5h; Mechanism; Product distribution;	A 17.5% B 25.5%
With dihydrogen peroxide; hydrogen fluoride; antimony pentafluoride at -20℃; for 0.5h;	A 17.5% B 25.5%

5-amino-1-naphthol (83-55-6) → 1,5-dihydroxynaphthalene (83-56-7)

Conditions	Yield
With sodium hydrogensulfite alkal. Verseifung des entstandenen Sulfits;

1-hydroxynaphthalene-5-sulphonic acid (117-59-9) → 1,5-dihydroxynaphthalene (83-56-7)

Conditions	Yield
With potassium carbonate beim Schmelzen;
With potassium carbonate at 200℃;
With sodium hydroxide at 220 - 260℃; beim Schmelzen;

1-aminonaphthalene-5-sulfonic acid (84-89-9) + furan-2,3,5(4H)-trione pyridine (1:1) → 5-amino-1-naphthol (83-55-6) + 1-hydroxynaphthalene-5-sulphonic acid (117-59-9) + 1,5-dihydroxynaphthalene (83-56-7) + 1-amino-naphthalene (134-32-7)

Conditions	Yield
at 220 - 300℃; im Autoklaven;

1-aminonaphthalene-5-sulfonic acid (84-89-9) → 1,5-dihydroxynaphthalene (83-56-7)

Conditions	Yield
With sodium hydroxide at 220 - 300℃; unter Druck;

8-hydroxy-4-oxo-1,2,3,4-tetrahydro-naphthalene-2-sulfonic acid ; sodium salt → 1,5-dihydroxynaphthalene (83-56-7)

Conditions	Yield
beim Erhitzen;

naphthalene-1,5-disulfonate (81-04-9) → 1,5-dihydroxynaphthalene (83-56-7)

naphthalene-1,5-disulfonate (81-04-9) + alkalies → 1,5-dihydroxynaphthalene (83-56-7)

Conditions	Yield
at 300℃;
at 220 - 260℃;

1,5-diaminonaphthalene (2243-62-1) + sodium disulfite → 5-amino-1-naphthol (83-55-6) + 1,5-dihydroxynaphthalene (83-56-7)

Conditions	Yield
Behandeln des Reaktionsprodukts mit Alkali;

5-amino-1-naphthol (83-55-6) + sodium disulfite + alkali → 1,5-dihydroxynaphthalene (83-56-7)

naphthalene (91-20-3) → 1,4-Dihydroxynaphthalene (571-60-8) + α-naphthol (90-15-3) + 2,7-Dihydroxynaphthalene (582-17-2) + 1,8-dihydroxynaphthalene (569-42-6) + 1,5-dihydroxynaphthalene (83-56-7) + β-naphthol (135-19-3) + all disubstituted naphthalenes; trisubstituted naphthalenes

Conditions	Yield
With n-butyllithium; potassium tert-butylate Product distribution; multistep reaction; isomer distribution as a function of the solvent and conditions (THF only monosubstitution), also after reaction with Me2SO4;

naphthalene-1.5-disulfonate sodium → 1,5-dihydroxynaphthalene (83-56-7)

Conditions	Yield
With potassium carbonate at 300℃;
With potassium carbonate at 220 - 260℃;

1-hydroxynaphthalene-5-sulphonic acid (117-59-9) + potash → 1,5-dihydroxynaphthalene (83-56-7)

Conditions	Yield
at 200℃; beim Schmelzen;
beim Schmelzen;

1-hydroxynaphthalene-5-sulphonic acid (117-59-9) + sodium hydroxide → 1,5-dihydroxynaphthalene (83-56-7)

Conditions	Yield
at 220 - 260℃; beim Schmelzen;

5-hydroxy-1-oxo-1,2,3,4-tetrahydronaphthalene-3-sulfonic acid (861353-26-6) + aqueous NaOH-solution → 1,5-dihydroxynaphthalene (83-56-7)

C16H16N2O6*C10H8O2 → 1,5-dihydroxynaphthalene (83-56-7) + C16H16N2O6 (533933-41-4)

Conditions	Yield
In chloroform at 24.85℃; Equilibrium constant;

4-acetylamino-8-amino-naphthalene-1-sulfonic acid (72493-43-7) → 1,5-dihydroxynaphthalene (83-56-7)

Conditions	Yield
Multi-step reaction with 4 steps 1: NaOH-solution 2: sodium disulfite / man behandelt das Produkt mit Natronlauge 3: hydrochloric acid 4: NaHSO3 / alkal. Verseifung des entstandenen Sulfits View Scheme

4-acetylamino-8-nitro-naphthalene-1-sulfonic acid → 1,5-dihydroxynaphthalene (83-56-7)

Conditions	Yield
Multi-step reaction with 5 steps 1: zinc dust; hydrochloric acid / 30 °C 2: NaOH-solution 3: sodium disulfite / man behandelt das Produkt mit Natronlauge 4: hydrochloric acid 5: NaHSO3 / alkal. Verseifung des entstandenen Sulfits View Scheme

4,8-diamino-naphthalene-1-sulfonic acid (152406-24-1) → 1,5-dihydroxynaphthalene (83-56-7)

Conditions	Yield
Multi-step reaction with 3 steps 1: sodium disulfite / man behandelt das Produkt mit Natronlauge 2: hydrochloric acid 3: NaHSO3 / alkal. Verseifung des entstandenen Sulfits View Scheme

8-amino-4-hydroxy-naphthalene-1-sulfonic acid (858186-61-5) → 1,5-dihydroxynaphthalene (83-56-7)

Conditions	Yield
Multi-step reaction with 2 steps 1: hydrochloric acid 2: NaHSO3 / alkal. Verseifung des entstandenen Sulfits View Scheme

sodium 4-amino-1-naphthalenesulfonate (130-13-2) → 1,5-dihydroxynaphthalene (83-56-7)

Conditions	Yield
Multi-step reaction with 6 steps 1: HNO3+H2SO4 2: zinc dust; hydrochloric acid / 30 °C 3: NaOH-solution 4: sodium disulfite / man behandelt das Produkt mit Natronlauge 5: hydrochloric acid 6: NaHSO3 / alkal. Verseifung des entstandenen Sulfits View Scheme

sodium hydrogensulfite + 1,5-diaminonaphthalene (2243-62-1) → 5-amino-1-naphthol (83-55-6) + 1,5-dihydroxynaphthalene (83-56-7)

Conditions	Yield
addn. of alkali;
addn. of alkali;

acid blue 5 → 5-methyl-2-hydroxyacetophenone (1450-72-2) + 4-hydroxybutanoic acid (591-81-1) + malic acid (617-48-1) + 2-hydroxyacrylic acid (19071-34-2) + 1,5-dihydroxynaphthalene (83-56-7) + 2,5-bis(1,1-dimethylethyl)-1,4-benzenediol (88-58-4) + 1-aminoethenol

Conditions	Yield
With dihydrogen peroxide pH=3; Kinetics; Reagent/catalyst; Concentration; pH-value;

disodium 1,5-naphthalenedisulfonate (1655-29-4) → 1,5-dihydroxynaphthalene (83-56-7)

Conditions	Yield
Stage #1: disodium 1,5-naphthalenedisulfonate With sodium hydroxide at 300 - 305℃; for 2h; Large scale; Stage #2: With sulfuric acid at 60℃; for 0.133333h; Temperature; Large scale;	1020 kg

1,5-dihydroxynaphthalene (83-56-7) → 5-hydroxynaphtho-1,4-quinone (481-39-0)

Conditions	Yield
With air; C32H36Br2N4 In methanol; dichloromethane at 20℃; for 1h; Irradiation;	100%
With C39H50N7O2S(1+)*F6P(1-); N,N,N-trimethyl-N-propylammonium bis(trifluoromethanesulfonyl)imide at 25℃; for 3h; Kinetics; UV-irradiation;	100%
With C171H45BF2N4; oxygen In methanol; dichloromethane at 20℃; Kinetics; Quantum yield; Reagent/catalyst;	99.9%

1,5-dihydroxynaphthalene (83-56-7) + magnesium methyl carbonate (4861-79-4) → 1,5-dihydroxy-2,6-naphthalenedicarboxylic acid (25543-68-4)

Conditions	Yield
In N,N-dimethyl-formamide at 180℃; under 25857.4 Torr; for 6h;	100%

1,5-dihydroxynaphthalene (83-56-7) + allyl bromide (106-95-6) → 1,5-Di-2-propenoxynaphthalene (127952-72-1)

Conditions	Yield
With potassium carbonate In acetone for 4h; Heating;	100%
With potassium carbonate In tetrahydrofuran; acetone Heating / reflux;	92%
Stage #1: 1,5-dihydroxynaphthalene With potassium carbonate In acetonitrile at 20℃; for 0.25h; Inert atmosphere; Stage #2: allyl bromide In acetonitrile for 12h; Reflux;	90%

1,5-dihydroxynaphthalene (83-56-7) + acetic anhydride (108-24-7) → 1,5-diacetoxynaphthalene (605-89-0)

Conditions	Yield
With pyridine for 1h;	99%
With pyridine at 20℃; for 12h; Inert atmosphere;	98%
With pyridine at 0 - 100℃; for 8h; Inert atmosphere;	98%

1,5-dihydroxynaphthalene (83-56-7) + 2-(2-Chloroethoxy)ethanol (628-89-7) → 1,5-bis[2-(2-hydroxyethoxy)ethoxy]naphthalene (136133-14-7)

Conditions	Yield
With potassium carbonate In acetonitrile at 82℃;	99%
With potassium carbonate; potassium iodide In N,N-dimethyl-formamide at 80℃; for 12h; Inert atmosphere;	75%
With potassium carbonate In N,N-dimethyl-formamide Heating;	67%

allyl methyl carbonate (35466-83-2) + 1,5-dihydroxynaphthalene (83-56-7) → 1,5-Di-2-propenoxynaphthalene (127952-72-1)

Conditions	Yield
With tris-(dibenzylideneacetone)dipalladium(0) In tetrahydrofuran at 25℃; for 24h; Condensation;	99%

vinyl acetate (108-05-4) + 1,5-dihydroxynaphthalene (83-56-7) → 1,5-diacetoxynaphthalene (605-89-0)

Conditions	Yield
With 1,4-diaza-bicyclo[2.2.2]octane In neat (no solvent) at 70 - 140℃; for 0.183333h; Microwave irradiation;	99%
With sodium carbonate In acetonitrile at 120℃; for 24h; Schlenk technique;	47%

trifluoromethylsulfonic anhydride (358-23-6) + 1,5-dihydroxynaphthalene (83-56-7) → naphthalene-1,5-diyl bis(trifluoromethanesulfonate) (152873-79-5)

Conditions	Yield
With pyridine In dichloromethane at 0 - 20℃; for 0.25h; Inert atmosphere; Schlenk technique;	98%
With pyridine In dichloromethane at 0 - 20℃; for 8h;	97%
With pyridine In dichloromethane at 0 - 20℃; Inert atmosphere;	96%

1,5-dihydroxynaphthalene (83-56-7) + dimethyl sulfate (77-78-1) → 1,5-dimethoxynaphthalene (10075-63-5)

Conditions	Yield
With sodium dithionite; tetrabutylammomium bromide; sodium hydroxide In tetrahydrofuran; water at 20 - 30℃; Inert atmosphere;	98%
With potassium carbonate In acetone Inert atmosphere; Reflux;	95.2%
With potassium carbonate In acetone for 18h; Reflux; Inert atmosphere;	88%

1,5-dihydroxynaphthalene (83-56-7) + 1-chloro-3-hydroxypropane (627-30-5) → 1,5-bis(3-hydroxypropoxy)naphthalene (220223-39-2)

Conditions	Yield
Stage #1: 1,5-dihydroxynaphthalene With potassium carbonate In acetonitrile for 1h; Inert atmosphere; Reflux; Stage #2: 1-chloro-3-hydroxypropane With potassium iodide In acetonitrile for 24h; Inert atmosphere; Heating;	98%
With caesium carbonate In acetonitrile Reflux;	45%

1,5-dihydroxynaphthalene (83-56-7) + 4-amino-phenol (123-30-8) → 5-hydroxy-4-((4-hydroxyphenyl)imino)naphthalen-1(4H)-one

Conditions	Yield
With oxygen; rose bengal In water for 5h; Irradiation; Green chemistry;	98%

1,5-dihydroxynaphthalene (83-56-7) + α-bromoacetophenone (70-11-1) → 1,5-bis(1-phenyl-ethan-1-one-2-yloxy)-naphthalene

Conditions	Yield
With potassium carbonate In acetone for 18h; Reflux;	97%
With potassium carbonate In acetonitrile for 4h; Heating;	71%

1,5-dihydroxynaphthalene (83-56-7) + ethyl 6-O-(tert-butyldiphenylsilyl)-4-O-methoxycarbonyl-2,3-dideoxy-α-D-erythro-hex-2-enopyranoside (162934-16-9) → 1,5-bis-(ethyl 6-O-tert-butyldiphenylsilyl-2,3-dideoxy-α-D-erythro-hex-2-enopyranosyl-4-oxy)naphthalene

Conditions	Yield
tris-(dibenzylideneacetone)dipalladium(0); 1,4-di(diphenylphosphino)-butane In tetrahydrofuran at 25℃; for 20h;	97%

1,5-dihydroxynaphthalene (83-56-7) + 4-nitro-benzoyl chloride (122-04-3) → 5-[(4-nitrobenzoyl)oxy]-1-naphthyl 4-nitrobenzoate (151010-39-8)

Conditions	Yield
With pyridine; dmap at 0 - 140℃;	97%
With sodium hydroxide In dichloromethane; water at 10℃; for 3h; Inert atmosphere;

1,5-dihydroxynaphthalene (83-56-7) + p-toluidine (106-49-0) → 5-hydroxy-4-(p-tolyl)-imino-1-naphthalenone (133586-45-5)

Conditions	Yield
With sodium periodate In methanol; ethanol at 20℃; for 1h;	96%

1,5-dihydroxynaphthalene (83-56-7) + 4-methoxy-benzaldehyde (123-11-5) + malononitrile (109-77-3) → 3,9-Diamino-1,7-bis-(4-methoxy-phenyl)-1,7-dihydro-4,10-dioxa-chrysene-2,8-dicarbonitrile (128405-15-2)

Conditions	Yield
With aluminum oxide; potassium fluoride In ethanol at 80℃;	96%

ammonium hexafluorophosphate + 4,4'-bis((η6-4-chlorophenoxy-η5-cyclopentadienyl)iron)biphenyl hexafluorophosphate + 1,5-dihydroxynaphthalene (83-56-7) → C10H6(OC6H4(Fe(C5H5))OC12H8OC6H4Cl(Fe(C5H5)))2(4+)*4PF6(1-)=[C10H6(OC6H4(Fe(C5H5))OC12H8OC6H4Cl(Fe(C5H5)))2](PF6)4

Conditions	Yield
With K2CO3; HCl In N,N-dimethyl-formamide stirring stoich. amts. of Fe-complex and C10H6(OH)2 with excess of K2CO3 (N2-atmosphere, room temp., 16 h), filtration into 10% HCl (pptn.), dissoln. on addn. of Me2CO washings, concn., addn. of concd. aq. NH4PF6 (pptn.); collection (filtration), washing (cold water), drying (vac.), washing (Et2O), drying; elem. anal.;	96%

1,5-dihydroxynaphthalene (83-56-7) + naphthalene-1,5-diylbis(dimethylphosphoramidite) (244775-40-4) → N3,N3,N16,N16-tetramethyl-2,4,15,17-tetraoxa-3,16-diphosphapentacyclo[20.4.0.05,10.09,14.018,23]hexacosa-1(22),5(10),6,8,11,13,18,20,23,25-decaene-3,16-diamine (244775-44-8)

Conditions	Yield
In acetonitrile Cyclization;	95%
In acetonitrile Cyclization;

1,5-dihydroxynaphthalene (83-56-7) + p-toluenesulfonic acid 2-[2-[2-(2-hydroxyethoxy)ethoxy]ethoxy]ethyl ester (77544-60-6) → 2-[2-(2-{2-[5-(2-{2-[2-(2-hydroxy-ethoxy)-ethoxy]-ethoxy}-ethoxy)-naphthalen-1-yloxy]-ethoxy}-ethoxy)-ethoxy]-ethanol (168211-64-1)

Conditions	Yield
With potassium carbonate; lithium bromide In acetonitrile for 24h; Heating;	94%
With potassium carbonate; lithium bromide In acetonitrile for 24h; Reflux;	94%
With potassium carbonate; lithium bromide In acetonitrile for 36h; Heating;	90%

1,5-dihydroxynaphthalene (83-56-7) + 2,4-dichlorobenzaldeyhde (874-42-0) + malononitrile (109-77-3) → 3,9-diamino-1,7-bis-(2,4-dichloro-phenyl)-1,7-dihydro-4,10-dioxa-chrysene-2,8-dicarbonitrile

Conditions	Yield
With aluminum oxide; potassium fluoride In ethanol at 80℃;	94%

1,5-dihydroxynaphthalene (83-56-7) + chloroacetic acid ethyl ester (105-39-5) → diethyl 2,2'-(naphthalene-1,5-diylbis(oxy))diacetate (32386-24-6)

Conditions	Yield
With potassium carbonate In N,N-dimethyl-formamide	93%
With potassium carbonate In acetonitrile for 12h; Reflux;	79.1%

1,5-dihydroxynaphthalene (83-56-7) + 4-chlorobenzaldehyde (104-88-1) + malononitrile (109-77-3) → 2,8-diamino-4,10-bis(4-chlorophenyl)-3,9-dicyano-4H,10H-chromeno[8,7-h]chromene (130944-08-0)

Conditions	Yield
With aluminum oxide; potassium fluoride In ethanol at 80℃;	93%
With triethylamine In ethanol for 0.166667h; Heating;	82%

[1,3]-dioxolan-2-one (96-49-1) + 1,5-dihydroxynaphthalene (83-56-7) → 2,2'-(naphthalene-1,5-diylbis(oxy))bis(ethan-1-ol) (14031-45-9)

Conditions	Yield
With 18-crown-6 ether; Aliquat 336; potassium hydroxide In 1,4-dioxane Inert atmosphere;	92%
With 1,4-dioxane; methanol; N-benzyl-trimethylammonium hydroxide

1,5-dihydroxynaphthalene (83-56-7) + ethyl acetoacetate (141-97-9) → 7-hydroxy-4-methyl-benzo[h]chromen-2-one (21353-16-2)

Conditions	Yield
With MnSb2O6-chitosan nanocomposite In neat (no solvent) at 80℃; for 0.5h; Pechmann Condensation;	92%
With silica supported boric trisulfuric anhydride In neat (no solvent) at 85℃; for 1.25h; Pechmann Condensation;	90%
With sulfuric acid In water at 20℃; for 24h; Condensation;	87%

1,5-dihydroxynaphthalene (83-56-7) + ethyl bromoacetate (105-36-2) → diethyl 2,2'-(naphthalene-1,5-diylbis(oxy))diacetate (32386-24-6)

Conditions	Yield
With potassium carbonate In acetone for 21h; Reflux;	92%
With potassium carbonate; acetone; potassium iodide

1,5-dihydroxynaphthalene (83-56-7) + Hexamethylphosphorous triamide (1608-26-0) → naphthalene-1,5-diylbis(dimethylphosphoramidite) (244775-40-4)

Conditions	Yield
In acetonitrile at 20℃; Substitution;	92%
In acetonitrile Substitution;
In acetonitrile at 20℃; for 2h;
In acetonitrile

1,5-dihydroxynaphthalene (83-56-7) + 4-methyl-benzoyl chloride (874-60-2) → C26H20O4

Conditions	Yield
at 120℃; for 0.5h;	92%

1,5-dihydroxynaphthalene (83-56-7) + 3-nitro-benzaldehyde (99-61-6) + malononitrile (109-77-3) → 3,9-diamino-1,7-bis-(3-nitro-phenyl)-1,7-dihydro-4,10-dioxa-chrysene-2,8-dicarbonitrile

Conditions	Yield
With aluminum oxide; potassium fluoride In ethanol at 80℃;	92%

1,5-dihydroxynaphthalene (83-56-7) + toluene-4-sulfonic acid 2-[2-(2-{2-[2-(2-hydroxy-ethoxy)-ethoxy]-ethoxy}-ethoxy)-ethoxy]-ethyl ester (42749-28-0) → 2-{2-[2-(2-{2-[2-(5-{2-[2-(2-{2-[2-(2-hydroxy-ethoxy)-ethoxy]-ethoxy}-ethoxy)-ethoxy]-ethoxy}-naphthalen-1-yloxy)-ethoxy]-ethoxy}-ethoxy)-ethoxy]-ethoxy}-ethanol (309920-44-3)

Conditions	Yield
With potassium carbonate; lithium bromide In acetonitrile for 36h; Heating;	92%
With potassium carbonate; potassium iodide In N,N-dimethyl-formamide at 100℃;	84%
With potassium carbonate In acetone for 20h; Heating;	47%
With potassium carbonate; potassium iodide In acetonitrile for 36h; Heating;

1,5-dihydroxynaphthalene (83-56-7) + benzene (71-43-2) → 5-hydroxy-4-phenyl-1-tetralone

Conditions	Yield
With aluminum tri-bromide at 25℃; for 24h;	92%

Upstream product

• 83-55-6 5-amino-1-naphthol 
• 117-59-9 1-hydroxynaphthalene-5-sulphonic acid 
• 84-89-9 1-aminonaphthalene-5-sulfonic acid 
• 81-04-9 naphthalene-1,5-disulfonate 
• 90-15-3 α-naphthol 
• 605-89-0 1,5-diacetoxynaphthalene 
• 2243-62-1 1,5-naphthalenediamine 
• 91-20-3 naphthalene 
• 861353-26-6 5-hydroxy-1-oxo-1,2,3,4-tetrahydronaphthalene-3-sulfonic acid 
• 10075-63-5 1,5-dimethoxynaphthalene 
• 1655-29-4 disodium 1,5-naphthalenedisulfonate 
• 130-13-2 sodium 4-amino-1-naphthalenesulfonate 
• 858186-61-5 8-amino-4-hydroxy-naphthalene-1-sulfonic acid 
• 152406-24-1 4,8-diamino-naphthalene-1-sulfonic acid 

Downstream Products

• 21353-16-2 7-hydroxy-4-methyl-benzo[h]chromen-2-one 
• 59198-81-1 2-(1,5-dihydroxy-[2]naphthoyl)-benzoic acid 
• 872821-67-5 2,2'-(1,5-dihydroxy-naphthalene-2,6-dicarbonyl)-di-benzoic acid 
• 1032-28-6 1,5-Bis-trimethylsilyloxy-naphthalin 
• 117440-14-9 4,8-ditrityl-naphthalene-1,5-diol 
• 101291-31-0 2-(2-hydroxy-phenylazo)-naphthalene-1,5-diol 
• 529-35-1 5,6,7,8-Tetrahydronaphthalen-1-ol 
• 481-39-0 5-hydroxynaphtho-1,4-quinone 
• 33892-75-0 5-Methoxy-1-tetralone 
• 40771-26-4 1,2,3,4-tetrahydro-1,5-dihydroxy-naphthalene 
• 66818-21-1 decahydronaphthalene-1,5-diol 
• 84-59-3 2,6-dibromo-1,5-naphthalenediol 
• 38028-39-6 5-hydroxy-1,2-naphthoquinone 
• 2243-62-1 1,5-naphthalenediamine 

Relevant academic research and scientific papers

Production method of 1,5-dihydroxy naphthlene

The invention discloses a production method of 1,5-dihydroxy naphthlene, which is characterized by comprising the following steps: taking the following raw materials in parts by weight: 10 parts of sodium hydroxide and 5-8 parts of sodium 1,5-naphthalene disulfonate with the water content of 3-10%; adding the sodium hydroxide into an alkali fusion reaction kettle, and heating to 260-320 DEG C; slowly and uniformly adding the sodium 1,5-naphthalene disulfonate with the water content of 3-10% while stirring; and hydrolyzing, lowering the temperature in the reaction kettle, slowly acidifying with 40-60% sulfuric acid, adding activated carbon accounting for 2 wt% of the sodium 1,5-naphthalene disulfonate and an inorganic salt catalyst into the reaction solution, and acidifying the filtrate with the rest 50% sulfuric acid until the pH value is 3-6, thereby obtaining the 1,5-dihydroxy naphthlene crude product with the purity of 95-97.8% and the water content of 30-50% and a pressure filtration mother solution. The method has the advantages of high product purity, high product quality, no pollution, recyclable generated mother solution, energy saving and environment friendliness.

A 1,5-dihydroxynaphthalene preparation method

The invention provides a preparation method of 1,5-dihydroxy naphthalene. The preparation method comprises the following steps: after sulfonation reaction between refined naphthalene and sulfonating agents, salting out to obtain reaction solid and reaction liquid; in the presence of catalysts, heating the reaction solid obtained in the former step, water and inorganic strong alkali to react to obtain1,5-dihydroxy naphthalene, wherein the catalysts are one or more of methanol, ethanol and propanol. The preparation method provided by the invention has the beneficial effects that the reaction temperature in the alkali fusion step in the 1,5-dihydroxy naphthalene production process is reduced, thus reducing the requirements of equipment and reducing the danger coefficient in actual production, so that the reaction conditions are mild and the preparation method is easy to operate.

Production of martite nanoparticles with high energy planetary ball milling for heterogeneous Fenton-like process

Natural martite microparticles (NMMs) were prepared with a high energy planetary ball mill to form a nanocatalyst for a Fenton-like process. Martite nanoparticles (MNs) of different scales are formed when the milling time ranges from 1 to 5 h at the milling speed of 300 rpm. The catalytic performances of MNs are higher than the NMMs for the degradation of acid blue 5 (AB5) in a heterogeneous Fenton-like process. The NMMs and the MNs were characterized by SEM, EDX, BET, XRD and FT-IR analyses. The size distribution of the 5 h milled martite nanoparticles (MN3) is in the range of 20 nm to 100 nm, and these have the highest surface area (19.23 m2 g-1). The influence of the main operational parameters, including initial pH, MN3 dosage, H2O2 and initial dye concentration, were investigated on the AB5 degradation. The treatment process obeys pseudo first order kinetics and some of the degradation intermediates were recognized by the GC-MS method. The environmentally-friendly production of the MNs, low amount of leached iron and repeated catalyst usage are the significant advantages of this research. Finally, an artificial neural network (ANN) is expanded to estimate the degradation efficiency of AB5 on the basis of the experimental results, which indicates the appropriate performance (R2 = 0.955).

METHOD FOR PRODUCING PHENOLS

PROBLEM TO BE SOLVED: To provide a rational and simple method which improves the yield of phenols by avoiding and suppressing the reaction of formed phenols with a diazonium salt that is an intermediate. SOLUTION: In a method for producing phenols, an aromatic amine compound is diazotized in a diluted sulfuric acid aqueous solution, then the obtained diazonium salt is supplied into a mixed aqueous solution composed of sulfuric acid and an organic compound, that is phase-separated from sulfuric acid, and the phenol formed by hydrolysis is recovered from an organic phase. COPYRIGHT: (C)2015,JPOandINPIT

An efficient method for demethylation of aryl methyl ethers

A new efficient method for demethylation of aryl methyl ethers using iodocyclohexane in DMF under reflux condition is described.

Process for functionalising a phenolic compound carrying an electron-donating group

The invention concerns a method for functionalizing a phenolic compound bearing an electron-donor group, in said group para position, inter alia a method for the amidoalkylation of a phenolic compound bearing an electron-donor group, and more particularly, a phenolic compound bearing an electron-donor group preferably, in the hydroxyl group ortho position. The method for functionalizing in para position with respect to an electron-donor group carried by a phenolic compound is characterised in that the phenolic compound bearing an electron-donor group is subjected to the following steps: a first step which consists of protecting the hydroxyl group in the form of a sulphonic ester function; a second step which consists in reacting the protected phenolic compound with an electrophilic reagent; optionally, a third step deprotecting the hydroxyl group.

Recognition of dihydroxynaphthalenes by a C2-symmetric host

A functionalized C2-symmetric host (2) shows high affinity and substrate selectivity for dihydroxynaphthalenes.

Polymer electrolyte and process for producing the same

A polymer electrolyte having, in a main chain, a structural unit represented by the following formula (1):-[Ar1-(SO2-N-(X+)-SO2-Ar2)m-SO2-N-(X+)-SO2-Ar1-O]- wherein Ar1 and Ar2 independently represent a divalent aromatic groups, m represents an integer of 0 to 3, and X+ represents an ion selected from hydrogen ion, an alkali metal ion and ammonium ion, which is excellent in proton conductivity, thermal resistance and strength. The polymer electrolyte is soluble in solvents and has excellent film forming property and recycling efficiency.

NON-AQUEOUS, LIQUID, ENZYME-CONTAINING COMPOSITIONS

A substantially water-free, liquid, enzyme-containing composition comprises: (A) an enzyme; (B) a substance selected from (i) substances which in aqueous medium are substrates for said enzyme, (ii) substances which in aqueous medium are precursors for substrates for said enzyme, and (iii) substances which are cofactors for said enzyme; and (C) a non-aqueous liquid phase.

Regioselective hydrolysis of diacetoxynaphthalenes catalyzed by Pseudomonas sp. lipase in an organic solvent

Depending on the relative positions of the acetyl groups in the aromatic rings, the Pseudomonas sp. lipase-catalyzed hydrolysis of diacetoxynaphthalenes in tert-butylmethyl ether proceeds regioselectively to afford the corresponding monoacetates.