618-41-7

Basic information

• Product Name: BENZENESULFINIC ACID
• Synonyms: benzenesulphinicacid;BENZENESULFINIC ACID;SODIUMBENZENESULPHINICACID
• CAS NO: 618-41-7
• Molecular Formula: C₆H₆O₂S
• Molecular Weight: 142.18
• EINECS: 210-548-4
• Product Categories: Industrial/Fine Chemicals;fine chemicals
• Mol File: 618-41-7.mol
• Article Data: 58

Chemical Properties

• Melting Point: 84°C
• Boiling Point: 111.5°C (estimate)
• Flash Point: 159.1 °C
• Appearance: /solid
• Density: 1.365 (estimate)
• Vapor Pressure: 3.58E-05mmHg at 25°C
• Refractive Index: 1.5300 (estimate)
• Storage Temp.: under inert gas (nitrogen or Argon) at 2-8°C
• PKA: 1.3(at 20℃)
• CAS DataBase Reference: BENZENESULFINIC ACID(CAS DataBase Reference)
• NIST Chemistry Reference: BENZENESULFINIC ACID(618-41-7)
• EPA Substance Registry System: BENZENESULFINIC ACID(618-41-7)

Safety Data

• Hazardous Substances Data: 618-41-7(Hazardous Substances Data)

Usage

Purification Methods

The acid is purified by dissolving the Na salt in H2O, acidifying to Congo Red paper with HCl and adding a concentrated solution of FeCl3 whereby Fe sulfinate precipitates. Collect the salt, wash it with a little H2O, drain, suspend it in H2O and add a slight excess of 1.5M aqueous NaOH. The Fe(OH)3 precipitates, it is filtered off, the sulfinic acid in the aqueous solution is extracted with Et2O, the extract is dried (Na2SO4) and evaporated to give colourless crystals of benzenesulfinic acid m 84o which are stored under N2 in the dark, as it slowly oxidises in air to the sulfonic acid. [Beilstein 11 H 2, 11 I 3, 11 II 3, 11 III 3, 11 IV 3.]

InChI:InChI=1/C6H6O2S/c7-9(8)6-4-2-1-3-5-6/h1-5H,(H,7,8)

Synthetic route

(2,4,6-trimethylphenyl) phenyl sulfone (3112-82-1) → Benzenesulfinic acid (618-41-7) + 1,3,5-trimethyl-benzene (108-67-8)

Conditions	Yield
With lithium amalgam In N,N-dimethyl-formamide for 2h; Ambient temperature;	A 99% B 100%

Methyl phenyl sulfone (3112-85-4) → Benzenesulfinic acid (618-41-7)

Conditions	Yield
With potassium tert-butylate; benzyl bromide In tetrahydrofuran at 23 - 40℃; for 1h;	98%
With sodium amalgam; ethanol

benzenesulfonic acid n-hexylester (781-07-7) → Benzenesulfinic acid (618-41-7) + hexan-1-ol (111-27-3)

Conditions	Yield
With lithium amalgam In 1,4-dioxane; isopropyl alcohol at 23℃; for 2h;	A 98% B 98%

2,2-dimethyl-3-phenylsulphonyl-1-tosyloxypropane (82777-32-0) → ((2,2-dimethylcyclopropyl)sulfonyl)benzene (16462-89-8) + Benzenesulfinic acid (618-41-7)

Conditions	Yield
With potassium tert-butylate In tert-butyl alcohol at 30℃; for 4h;	A 98% B 65%

benzene (71-43-2) → Benzenesulfinic acid (618-41-7)

Conditions	Yield
With hydrogenchloride; aluminium(III) triflate; sulfur dioxide; acetic acid at 20℃; under 760.051 Torr; for 35h; Pressure; Temperature;	95%
With aluminium trichloride; sulfur dioxide Zersetzen des Reaktionsprodukts mit Eis und von Salzsaeure;
With aluminium trichloride; sulfur dioxide Zersetzen des Reaktionsprodukts mit Eis und von Salzsaeure; Man bringt die Reaktion zweckmaessig durch Einleiten von etwas trocknem Chlorwasserstoff in Gang;

C22H20O4S2 (82480-46-4) → (((1E,3E)-4-phenylbuta-1,3-dien-1-yl)sulfonyl)benzene (67229-92-9) + Benzenesulfinic acid (618-41-7)

Conditions	Yield
With sodium ethanolate In ethanol at 20℃; for 16h;	A 94% B 83%

C18H20O4S2 (92362-59-9, 92362-60-2) → cyclohexa-1,4-diene (1165952-92-0) + cyclohexa-1,3-diene (1165952-91-9) + Benzenesulfinic acid (618-41-7)

Conditions	Yield
With sodium ethanolate In ethanol at 180℃; for 18h; var. time and temp.; Title compound not separated from byproducts;	A 20 % Spectr. B 60 % Spectr. C 91%
With sodium ethanolate In ethanol at 180℃; for 18h; Title compound not separated from byproducts;	A 20 % Spectr. B 60 % Spectr. C 91%

bis(1,3-dioxoisoindolin-2-yl)hexanedioate + 2-(benzenesulfonyl)ethynylbenzene (5324-64-1) → benzylidenecyclopentane (4410-77-9) + Benzenesulfinic acid (618-41-7)

Conditions	Yield
With tris(2,2'-bipyridyl)ruthenium dichloride; diethyl 2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate; N-ethyl-N,N-diisopropylamine In dichloromethane at 0.25℃; for 4h; Catalytic behavior; Mechanism; Solvent; Reagent/catalyst; Time; Inert atmosphere; Schlenk technique; Sealed tube; Irradiation;	A 90% B n/a

sodium ethanolate (141-52-6) + 1-Benzenesulfonylmethyl-4,8-dithia-spiro[2.5]octane 4,4,8,8-tetraoxide (115373-55-2) → 2-(1,3-Diethoxy-propyl)-[1,3]dithiane 1,1,3,3-tetraoxide (115373-75-6) + Benzenesulfinic acid (618-41-7)

Conditions	Yield
In ethanol at 20℃; for 16h;	A 89% B 88%

(cyclohex-2-enylsulfonyl)benzene (87413-32-9) → cyclohexa-1,4-diene (1165952-92-0) + cyclohexa-1,3-diene (1165952-91-9) + Benzenesulfinic acid (618-41-7)

Conditions	Yield
With sodium ethanolate In ethanol at 180℃; for 19h; var. temp.; Title compound not separated from byproducts;	A 21 % Spectr. B 66 % Spectr. C 89%
With sodium ethanolate In ethanol at 180℃; for 19h; var. temp.; Title compound not separated from byproducts;	A 21 % Spectr. B 18 % Spectr. C 89%

sodium ethanolate (141-52-6) + (1R,2R)-2-Benzenesulfonylmethyl-cyclopropanecarbonitrile (82480-47-5, 115373-51-8) → 3,5-Diethoxy-pentanenitrile (115373-73-4) + Benzenesulfinic acid (618-41-7)

Conditions	Yield
In ethanol at 20℃; for 16h;	A 84% B 85%

PVS (5535-48-8) + 3,4-dineopentylthiophene 1,1-dioxide (156222-94-5) → o-dineopentylbenzene (1019-77-8) + Benzenesulfinic acid (618-41-7)

Conditions	Yield
In chlorobenzene for 15h; Heating;	A 84% B n/a

sodium benzenesulfonate (873-55-2) → Benzenesulfinic acid (618-41-7) + benzenesulfonic acid (98-11-3)

Conditions	Yield
With hydrogenchloride; sodium hydroxide; dihydrogen peroxide In ethanol; water for 0.166667h; Product distribution; Ambient temperature; other eq. of reagent;	A 82% B 18%

sodium ethanolate (141-52-6) + (1R,2R)-2-Benzenesulfonylmethyl-1-phenyl-cyclopropanecarbonitrile (82480-48-6, 115373-54-1) → 3,5-Diethoxy-2-phenyl-pentanenitrile (115373-74-5) + Benzenesulfinic acid (618-41-7)

Conditions	Yield
In ethanol at 20℃; for 16h;	A 79% B 81%

sodium ethanolate (141-52-6) + C16H16O4S2 (82480-43-1, 115373-50-7) → (2,4-Diethoxy-butane-1-sulfonyl)-benzene (82480-44-2) + Benzenesulfinic acid (618-41-7)

Conditions	Yield
In ethanol at 20℃; for 16h;	A 66% B 80%
In ethanol at 20℃; for 16h; Kinetics; Mechanism; Product distribution; various cyclopropanes and unstrained compounds;	A 66% B 80%

(+/-)-N-(tert-butyldimethylsilyloxy)benzenesulfinamide (1355362-43-4) → N-[(dimethyl)(1,1-dimethylethyl)silyl]benzenesulfonamide + Benzenesulfinic acid (618-41-7)

Conditions	Yield
With sodium hydride Aza-Brook rearrangement;	A 80% B n/a

N-Phenyl-2-benzoyl-2-phenylsulfinyl-acetamid (100749-37-9) → Benzenesulfinic acid (618-41-7) + 3-oxo-3-phenylpropionanilide (959-66-0)

Conditions	Yield
With water In ethanol for 2h; Heating;	A n/a B 76%

S-Phenyl benzenethiosulfonate (1212-08-4) + sodium salt of triacetic acid lactone (30536-52-8) → Benzenesulfinic acid (618-41-7) + 4-hydroxy-6-methyl-3-(phenylsulfanyl)-2H-pyran-2-one (53603-21-7)

Conditions	Yield
In ethanol	A 55% B n/a

thiophenol (108-98-5) → S-Phenyl benzenethiosulfonate (1212-08-4) + Benzenesulfinic acid (618-41-7) + diphenyldisulfane (882-33-7) + benzenesulfonic acid (98-11-3)

Conditions	Yield
With hydrogenchloride; sodium hydroxide; dihydrogen peroxide In ethanol; water for 0.166667h; Product distribution; Ambient temperature; other eq. of reagent;	A 7% B 39% C 15% D 3%
With hydrogenchloride; sodium hydroxide; dihydrogen peroxide 1.) water, EtOH, rt., 10 min ; 2.) water, 0 deg C; Yield given. Multistep reaction;	A 7% B n/a C 15% D 3%

Methyl phenyl sulfone (3112-85-4) + sodium thiophenolate (930-69-8) → methyl-phenyl-thioether (100-68-5) + Benzenesulfinic acid (618-41-7)

Conditions	Yield
In ethanol at 170℃; for 20h; Product distribution;	A 37% B n/a

1,1'-sulfinylbisbenzene (945-51-7) → Benzenesulfinic acid (618-41-7)

Conditions	Yield
With water; dinitrogen monoxide Ambient temperature; Irradiation; pH:2; dependence upon pH;	0.9%

methanol (67-56-1) + (dma)2CH-SO2Ph (49742-78-1) + furan-2,3,5(4H)-trione pyridine (1:1) → 4,4'-bis(dimethylamino)benzhydrol (119-58-4) + Benzenesulfinic acid (618-41-7)

benzenesulfonamide (98-10-2) → Benzenesulfinic acid (618-41-7) + Phenyl azide (622-37-7)

Conditions	Yield
With potassium hydroxide; benzene diazonium chloride

methyl magnesium iodide (917-64-6) + S-Phenyl benzenethiosulfonate (1212-08-4) + diethyl ether (60-29-7) → methyl-phenyl-thioether (100-68-5) + Benzenesulfinic acid (618-41-7) + diphenyldisulfane (882-33-7)

1-phenyl-2-(phenylsulfonyl)ethane (27846-25-9) + ethanol (64-17-5) + sodium ethanolate (141-52-6) → styrene (292638-84-7) + Benzenesulfinic acid (618-41-7)

Conditions	Yield
at 235℃;

S-Phenyl benzenethiosulfonate (1212-08-4) + diethyl ether (60-29-7) + phenylmagnesium iodide (16002-63-4) → biphenyl (92-52-4) + diphenyl sulfide (139-66-2) + Benzenesulfinic acid (618-41-7) + diphenyldisulfane (882-33-7)

S-Phenyl benzenethiosulfonate (1212-08-4) → thiophenol (108-98-5) + Benzenesulfinic acid (618-41-7)

Conditions	Yield
With ethanol; zinc
With ethanol; hydrogen sulfide

S-Phenyl benzenethiosulfonate (1212-08-4) → Benzenesulfinic acid (618-41-7)

Conditions	Yield
With ethanol; thiophenol
With ethanol; 2-Naphthalenethiol
With methyl magnesium iodide; diethyl ether
With diethyl ether; phenylmagnesium iodide
Multi-step reaction with 2 steps 1: alcohol; zinc 2: alcohol View Scheme

S-Phenyl benzenethiosulfonate (1212-08-4) → Benzenesulfinic acid (618-41-7) + diphenyldisulfane (882-33-7)

Conditions	Yield
With potassium hydroxide

ethanol (64-17-5) + 1-phenyl-3-(phenylsulfonyl)propan-1-one (65885-28-1) + sodium ethanolate (141-52-6) → Benzenesulfinic acid (618-41-7)

1-decenyl(phenyl)(tetrafluoroborato)-λ3-iodane (102987-32-6) + Benzenesulfinic acid (618-41-7) → (Z)-[β-(phenylsulfonyl)vinyl]iodonium tetrafluoroborate

Conditions	Yield
In methanol at 0℃; for 0.5h;	100%

dirhodium tetraacetate + Benzenesulfinic acid (618-41-7) → tri(phenylsulphinato)rhodium(III)

Conditions	Yield
In tetrahydrofuran byproducts: CH3CO2H, H2; N2-atmosphere; excess of sulphinic acid, refluxing for 4 h (pptn.); filtration (in air), washing (THF), drying (vac.); elem. anal.;	100%
In methanol byproducts: CH3CO2H, H2; N2-atmosphere;	99%

1,3-diphenyl-2-propynone (7338-94-5) + Benzenesulfinic acid (618-41-7) → (Z)-1,3-diphenyl-3-(phenylsulfonyl)prop-2-en-1-one

Conditions	Yield
In ethanol at 20℃; for 40h; pH=3.5; Kinetics; Time; stereoselective reaction;	99%
With 2,6-di-tert-butyl-4-methyl-phenol In ethanol Inert atmosphere;	98%
With methanol

[1-(3-cyclopentyl)propynyl]-phenyliodonium tetrafluoroborate (105502-63-4) + Benzenesulfinic acid (618-41-7) → (Z)-phenyl(3-cyclopentyl-2-(phenylsulfonyl)-1-propenyl)iodonium tetrafluoroborate

Conditions	Yield
In methanol at 0℃; for 0.5h;	99%

1-methylindole (603-76-9) + Benzenesulfinic acid (618-41-7) → 1-methyl-3-(phenylthio)-1H-indole (63955-67-9)

Conditions	Yield
With tetra-(n-butyl)ammonium iodide; toluene-4-sulfonic acid In 1,2-dichloro-ethane at 80℃; for 12h; regioselective reaction;	99%
With tetra-(n-butyl)ammonium iodide; toluene-4-sulfonic acid at 70℃; for 0.166667h; Sealed tube; Microwave irradiation; Green chemistry;	95%

C12H7N3S (1313215-29-0) + Benzenesulfinic acid (618-41-7) → 3-(phenylsulfonyl)-2-(thiophen-2-yl)-1H-indole

Conditions	Yield
With tert.-butylhydroperoxide In decane; N,N-dimethyl-formamide at 80℃; for 24h; Inert atmosphere; Sealed tube;	99%

1-((2-azidophenyl)ethynyl)naphthalene + Benzenesulfinic acid (618-41-7) → 2-(naphthalen-1-yl)-3-(phenylsulfonyl)-1H-indole

Conditions	Yield
With tert.-butylhydroperoxide In decane; N,N-dimethyl-formamide at 80℃; for 24h; Inert atmosphere; Sealed tube;	99%

1-phenyl-hept-2-yn-1-one (18998-78-2) + Benzenesulfinic acid (618-41-7) → (Z)-1-phenyl-3-(phenylsulfonyl)hept-2-en-1-one

Conditions	Yield
In ethanol at 20℃; for 40h; pH=3.5; stereoselective reaction;	99%
With vanillin In ethanol at 20℃; UV-irradiation;	99%

p-chlorobenzoylphenylacetylene (16616-42-5) + Benzenesulfinic acid (618-41-7) → (Z)-1-(4-chlorophenyl)-3-phenyl-3-(phenylsulfonyl)prop-2-en-1-one

Conditions	Yield
In ethanol at 20℃; for 40h; pH=3.5; stereoselective reaction;	99%
With vanillin In ethanol at 20℃; UV-irradiation;	99%

1-(3,4-dichlorophenyl)-3-phenyl-2-propyn-1-one (33320-96-6) + Benzenesulfinic acid (618-41-7) → (Z)-1-(3,4-dichlorophenyl)-3-phenyl-3-(phenylsulfonyl)prop-2-en-1-one

Conditions	Yield
In ethanol at 20℃; for 40h; pH=3.5; stereoselective reaction;	99%

Benzenesulfinic acid (618-41-7) + 1-phenyl-3-(4-methylphenyl)prop-2-yn-1-one (14939-05-0) → (E)-1-phenyl-3-(phenylsulfonyl)-3-(p-tolyl)prop-2-en-1-one

Conditions	Yield
With potassium carbonate In water; N,N-dimethyl-formamide at 20℃; for 40h; stereoselective reaction;	99%

2-vinyl-β-ionol (5208-93-5) + Benzenesulfinic acid (618-41-7) → 1-Benzolsulfonyl-3-methyl-5-(2',6',6'-trimethyl-cyclohex-1-enyl)-penta-2,4-dien (50464-14-7)

Conditions	Yield
In water at 40℃; Temperature; Microwave irradiation;	99%

1-ethenyl-2-pyrrolidinone (88-12-0) + Benzenesulfinic acid (618-41-7) → 1-(1-(phenylsulfonyl)ethyl)pyrrolidin-2-one

Conditions	Yield
With photoredox catalyst Ni/TiO2 In acetonitrile at 20℃; for 3.5h; Molecular sieve; Irradiation;	99%

allyl alcohol (107-18-6) + Benzenesulfinic acid (618-41-7) → (allylsulfonyl)benzene (16212-05-8)

Conditions	Yield
palladium(II) acetylacetonate; triethylaluminum; triphenylphosphine In toluene at 100℃; for 5h;	98%

maleic anhydride (930-60-9) + Benzenesulfinic acid (618-41-7) → 4-phenylsulfonyl-1,3-cyclopentanedione (106609-97-6)

Conditions	Yield
With triethylamine In chloroform at 20℃; for 24h;	98%

allyl 2-chlorophenyl ether (20788-42-5) + Benzenesulfinic acid (618-41-7) → (allylsulfonyl)benzene (16212-05-8)

Conditions	Yield
palladium(II) acetylacetonate; triethylaluminum; triphenylphosphine In toluene at 100℃; for 5h;	98%

(R)-N-(1-(4-methoxyphenyl)ethyl)-4-methyl-benzenesulfonamide (1125576-35-3) + Benzenesulfinic acid (618-41-7) → 1-(1-Benzenesulfonyl-ethyl)-4-methoxy-benzene (107270-96-2)

Conditions	Yield
In chloroform at 20℃; for 10h; optical yield given as %ee;	98%

Benzenesulfinic acid (618-41-7) + isopropenylbenzene (98-83-9) → 2-hydroxy-2-phenylpropyl phenyl sulfone (77144-79-7)

Conditions	Yield
Stage #1: Benzenesulfinic acid; isopropenylbenzene With pyridine; oxygen In chloroform at 45℃; under 760.051 Torr; for 1.33333h; Schlenk technique; Stage #2: With triphenylphosphine In chloroform at 45℃; under 760.051 Torr; for 0.5h; Reagent/catalyst; Solvent; Temperature; Schlenk technique;	98%
With 1,4-diaza-bicyclo[2.2.2]octane; eosin y In acetonitrile at 25 - 30℃; for 24h; Irradiation;	98%
With Graphite; tetrabutylammonium tetrafluoroborate; water; platinum In acetonitrile at 20℃; for 4.5h; Reagent/catalyst; Electrochemical reaction;	76%

indole (120-72-9) + Benzenesulfinic acid (618-41-7) → 3-phenylthioindole (54491-43-9)

Conditions	Yield
With tetra-(n-butyl)ammonium iodide; toluene-4-sulfonic acid In 1,2-dichloro-ethane at 80℃; for 12h; Reagent/catalyst; Solvent; regioselective reaction;	98%
With tetra-(n-butyl)ammonium iodide; toluene-4-sulfonic acid at 70℃; for 0.166667h; Reagent/catalyst; Temperature; Sealed tube; Microwave irradiation; Green chemistry;	95%

5-bromo-1H-indole (10075-50-0) + Benzenesulfinic acid (618-41-7) → 5-bromo-3-(phenylsulfanyl)-1H-indole

Conditions	Yield
With tetra-(n-butyl)ammonium iodide; toluene-4-sulfonic acid In 1,2-dichloro-ethane at 80℃; for 12h; regioselective reaction;	98%
With tetra-(n-butyl)ammonium iodide; toluene-4-sulfonic acid at 70℃; for 0.166667h; Sealed tube; Microwave irradiation; Green chemistry;	92%

di-isopropyl azodicarboxylate (2446-83-5) + Benzenesulfinic acid (618-41-7) → diisopropyl 1-(phenylsulfonyl)hydrazine-1,2-dicarboxylate (60226-11-1)

Conditions	Yield
In methanol at 20℃; for 12h; Solvent; Temperature; Green chemistry;	98%

di-tert-butyl-diazodicarboxylate (870-50-8) + Benzenesulfinic acid (618-41-7) → di-tert-butyl 1-(phenylsulfonyl)hydrazine-1,2-dicarboxylate

Conditions	Yield
In methanol at 20℃; for 12h; Green chemistry;	98%

1,1-bis(4-methoxyphenyl)prop-2-en-1-ol (101018-40-0) + Benzenesulfinic acid (618-41-7) → 4,4’-[3-(phenylsulfonyl)prop-1-ene-1,1-diyl]bis(methoxybenzene)

Conditions	Yield
With oxygen In 1,2-dichloro-ethane at 120℃; for 0.0833333h; regioselective reaction;	98%

C15H11N3 (1417819-67-0) + Benzenesulfinic acid (618-41-7) → 5-methyl-2-phenyl-3-(phenylsulfonyl)-1H-indole

Conditions	Yield
With tert.-butylhydroperoxide In decane; N,N-dimethyl-formamide at 80℃; for 24h; Inert atmosphere; Sealed tube;	98%

Benzenesulfinic acid (618-41-7) + 1-phenyl-3-(4-methylphenyl)prop-2-yn-1-one (14939-05-0) → (Z)-1-phenyl-3-(phenylsulfonyl)-3-(p-tolyl)prop-2-en-1-one

Conditions	Yield
In ethanol at 20℃; for 72h; pH=3.5; stereoselective reaction;	98%

3-piperidyl-1,7-octadiene (64579-51-7, 78344-18-0, 78344-19-1) + Benzenesulfinic acid (618-41-7) → (Octa-1,7-diene-3-sulfonyl)-benzene

Conditions	Yield
palladium(II) acetylacetonate; triethylaluminum; triphenylphosphine In toluene at 100℃; for 5h;	97%

Upstream product

• 67-56-1 methanol 
• 49742-78-1 (dma)2CH-SO₂Ph 
• 98-10-2 benzenesulfonamide 
• 917-64-6 methyl magnesium iodide 
• 1212-08-4 S-Phenyl benzenethiosulfonate 
• 60-29-7 diethyl ether 
• 27846-25-9 1-phenyl-2-(phenylsulfonyl)ethane 
• 64-17-5 ethanol 
• 141-52-6 sodium ethanolate 
• 16002-63-4 phenylmagnesium iodide 
• 65885-28-1 1-phenyl-3-(phenylsulfonyl)propan-1-one 
• 127-63-9 diphenyl sulphone 
• 599-71-3 piloty's acid 
• 6415-38-9 benzenediazonium sulphate 

Downstream Products

• 100710-97-2 2-(2-benzenesulfonyl-ethyl)-4-methyl-pyridine 
• 77383-19-8 phenyl hydroxyethyl sulfone 
• 882-33-7 diphenyldisulfane 
• 59010-67-2 3-methyl-4-(phenylthio)phenol 
• 1146-39-0 4-nitrophenyl phenyl sulfone 
• 1135-14-4 4-aminophenyl phenyl sulfide 
• 21229-95-8 4-(benzenesulfinyl)aniline 
• 1212-08-4 S-Phenyl benzenethiosulfonate 
• 23156-75-4 2-phenylsulfonyl-1,4-dihydroxybenzene 
• 112841-95-9 N,N'-bis-benzenesulfonylmethyl-o-phenylenediamine 
• 802869-23-4 benzenesulfonic acid N-phenyl-hydrazide 
• 10409-06-0 diphenyl disulfone 
• 896-80-0 1-benzenesulfonyl-2,4-dinitro-benzene 
• 105901-78-8 5-benzenesulfonyl-2-methyl-phenol 

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