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104-15-4

Basic Information
CAS No.: 104-15-4
Name: p-Toluenesulfonic acid
Molecular Structure:
Molecular Structure of 104-15-4 (p-Toluenesulfonic acid)
Formula: C7H8O3S
Molecular Weight: 190.21
Synonyms: P-Toluene sulfonic acid monohydrate;2-Toluene Sulfonic Acid;4-Toluene sulfonic acid;P-Toluosulfonic Acid Monohydrate;Methylbenzenesulfonic acid;Toluene-p-sulfonate;4-methylbenzenesulfonic acid;Cyzac 4040;4-Toluenesulfonic acid;Cyclophil P T S A;Benzenesulfonic acid, methyl-;p-toluene sulfonic acid;Toluene-4-sulfonic acid;ar-Toluenesulfonic acid;Kyselina p-toluenesulfonova;p-Toluene-sulfonic acid;Toluene-4-sulfonate;Benzenesulfonic acid, 4-methyl-;Benzenesulfonic acid,4-methyl-;Eltesol;p-Tolylsulfonic acid;p-Methylbenzene sulfonic acid;toluene-4-sulphonic acid;o-toluenesulfonic Acid;
EINECS: 203-180-0
Density: 1.34 g/cm3
Melting Point: 106~107 °C
Boiling Point: 116 °C
Flash Point: 41 °C
Solubility: soluble
Appearance: clear colorless to light yellow solution
Hazard Symbols: CorrosiveC
Risk Codes: 34-10
Safety: 45-26-23
Transport Information: UN 2585
PSA: 62.75000
LogP: 2.32250
Synthetic route
98-59-9

p-toluenesulfonyl chloride

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
With copper(l) iodide; N,N,N,N,-tetramethylethylenediamine; water; phenylzinc(II) bromide In tetrahydrofuran at 0 - 20℃; Inert atmosphere;100%
Stage #1: p-toluenesulfonyl chloride With dmap; N-ethyl-N,N-diisopropylamine In dichloromethane at 22℃;
Stage #2: With trifluoroacetic acid In dichloromethane Further stages.;
95%
With pyridine; dmap In dichloromethane82%
106-45-6

para-thiocresol

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
With dinitrogen tetraoxide In tetrachloromethane; diethyl ether for 2.5h; Ambient temperature;100%
With dihydrogen peroxide; trichlorophosphate In water at 80℃; for 1.16667h; Micellar solution;95%
With HOF* CH3CN In dichloromethane at 0℃;90%
With dihydrogen peroxide; methyltrioxorhenium(VII) In acetonitrile at 20℃;87%
Multi-step reaction with 2 steps
1: pyridine / acetonitrile / Heating
2: hydrogenchloride; water / 40 °C
View Scheme
26177-05-9

1-(p-methylbenzenesulfonoyloxy)-2(1H)-quinolone

A

104-15-4

toluene-4-sulfonic acid

B

58-57-1

1-hydroxycarbostyril

Conditions
ConditionsYield
With sodium hydroxide In tetrahydrofuran for 2h; Product distribution; Ambient temperature;A n/a
B 98%
15404-00-9

triethylammonium toluene-p-sulfonate

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
With sulfuric acid In water pH=3;97.5%

(1,1-dioxido-4-oxo-3-phenyl-4H-thiochromen-2-yl)methyl 4-methylbenzenesulfonate

A

1033736-87-6

C16H10O3S

B

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
In chloroform-d1 for 0.233333h; Photolysis; Inert atmosphere;A n/a
B 97%
103-19-5

di(p-tolyl) disulfide

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
With dihydrogen peroxide; trichlorophosphate In water at 80℃; for 1h; Micellar solution;94%
108-88-3

toluene

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
With sulfur trioxide at 35 - 65℃; Temperature; Inert atmosphere;93.3%
With sodium hydrogensulfite; pyridinium chlorochromate In neat (no solvent) at 100℃; under 1500.15 Torr; for 0.0666667h; Reagent/catalyst; Microwave irradiation;93%
With 1,3-disulfonic acid imidazolonium chloride In water at 50℃; for 0.05h; Green chemistry; regioselective reaction;72%
84877-44-1

toluene-4-sulfonic acid 2,2,2-trifluoro-1-p-tolyl-ethyl ester

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
With trifluoroacetic acid In water at 20℃; for 2h;91%
64-04-0

phenethylamine

98-59-9

p-toluenesulfonyl chloride

A

5450-75-9

4-methyl-N-(2-phenylethyl)benzenesulfonamide

B

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
With n-butyllithium In tetrahydrofuran; hexane at -50℃; for 2h; Product distribution; Mechanism; further amines;A 90%
B 10%
With n-butyllithium 1) THF, hexane, -10 deg C, 15 min, 2) THF, hexane, -50 deg C, 2 h; Yield given. Multistep reaction. Yields of byproduct given;
478363-68-7

phenylmethyl 3,5,6,7,8,8a-hexahydro-5,5,8a-trimethyl-6-(trifluoroacetylamino)-(6β,8aβ)-2(1H)-isoquinolinecarboxylate

A

N-Trifluoroacetyl-1,2,3,5,6,7,8,8a-octahydro-5,5,8a-trimethyl-(6β,8aβ)-6-isoquinolineamine 4-methylbenzenesulfonate

B

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
In ethanol; di-isopropyl ether; palladiumA n/a
B 90%
26177-05-9

1-(p-methylbenzenesulfonoyloxy)-2(1H)-quinolone

B

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
In methanol; water Quantum yield; UV-irradiation; Photolysis;A n/a
B 90%
86108-37-4

Toluene-4-sulfonic acid 2-methyl-1,2-diphenyl-propyl ester

A

781-33-9

2-methyl-1,1-diphenylpropene

B

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
at 115℃; Product distribution; Rate constant; Thermodynamic data; Ea(excit.), ΔS(excit.);A 85%
B n/a
4031-16-7

N'-2-butanylidene-4-methylbenzenesulfonohydrazine

A

104-15-4

toluene-4-sulfonic acid

B

78-93-3

butanone

Conditions
ConditionsYield
With molecular sieve; dihydrogen peroxide In methanol for 4h; Mechanism; Heating; other solvent; tosylhydrazones of other ketones;A n/a
B 84%

3,4-dichloro-5-[(4-me thylphenyl)sulfanyl]-2(5H)-furanone

A

766-40-5

Mucochloric acid

B

1610693-10-1

3,4-dichloro-5-[(4-methyl phenyl)sulfonyl]-2(5H)-furanone

C

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
With dihydrogen peroxide In water; acetic acid at 20℃; for 96h;A n/a
B 83%
C n/a
624-31-7

4-tolyl iodide

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
With (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride; caesium carbonate; Aminoiminomethanesulfinic acid In dimethyl sulfoxide at 100℃; for 14h;80%
With (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride; caesium carbonate; Aminoiminomethanesulfinic acid In dimethyl sulfoxide at 100℃; for 14h; Reagent/catalyst; Solvent; Green chemistry;78%
2943-42-2

di(4-methyl)phenylthiosulfonate

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
With bis-[(trifluoroacetoxy)iodo]benzene In acetonitrile for 2h; Heating;78%
824-79-3

sodium 4-methylbenzenesulfinate

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
With 18O-labeled water In dimethyl sulfoxide at 100℃; for 14h; Reagent/catalyst;75%
With hydrogenchloride; oxygen In d(4)-methanol at 20℃; for 0.166667h;
73706-60-2

1-tosyloxy-4-phenyl-2-butanone

A

644-08-6

4-Methylbiphenyl

B

2550-26-7

4-Phenyl-2-butanone

C

37985-17-4

1,4-diphenyl-2-butanone

D

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
In benzene Irradiation;A 13%
B 7%
C 10%
D 74%
86108-35-2

Toluene-4-sulfonic acid 2,2-dimethyl-3-oxo-1,3-diphenyl-propyl ester

A

29689-80-3

3-methyl-1,2-diphenylbut-2-en-1-one

B

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
at 130℃; Product distribution; Rate constant; Thermodynamic data; Ea(excit.), ΔS(excit.);A 74%
B n/a
1577-18-0

(E)-3-hexenoic acid

A

2407-43-4

5-ethyl-5H-furan-2-one

B

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
With hydroxy(tosyloxy)iodobenzene; 1,8-diazabicyclo[5.4.0]undec-7-ene In dichloromethane for 5h; Ambient temperature;A 32%
B 71%
13668-61-6

(cyclopent-2-eneyl)acetic acid

A

5650-67-9

3,3a,4,6a-tetrahydro-2H-cyclopenta[b]furan-2-one

B

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
With hydroxy(tosyloxy)iodobenzene; 1,8-diazabicyclo[5.4.0]undec-7-ene In dichloromethane for 4h; Ambient temperature;A 56%
B 70%
3695-77-0

triphenylmethanethiol

1950-69-2

toluene-p-sulfonyl bromide

A

76-84-6

triphenylmethyl alcohol

B

104-15-4

toluene-4-sulfonic acid

C

118511-93-6

Toluene-4-thiosulfonic acid S-trityl ester

Conditions
ConditionsYield
With triethylamine In tetrachloromethane at 0℃; for 0.5h; Yields of byproduct given;A n/a
B n/a
C 70%
56410-24-3

N,N'-bis(p-toluenesulfonyl)hydroxylamine

A

62419-04-9

bis(4-methylphenylsulfonyl)amino 4-methylbenzenesulfonate

B

104-15-4

toluene-4-sulfonic acid

C

98-59-9

p-toluenesulfonyl chloride

Conditions
ConditionsYield
With air In chloroform for 12h; Product distribution; Mechanism; Ambient temperature; various reaction conditions;A 20%
B 70%
C 5%
657-84-1

sodium tosylate

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
With hydrogenchloride In diethyl ether; water for 0.5h;69%
Stage #1: sodium tosylate In tert-butyl methyl ether; water for 0.166667h;
Stage #2: With hydrogenchloride In tert-butyl methyl ether; water for 0.333333h;
27126-76-7

[hydroxy(tosyloxy)iodo]benzene

75759-33-0, 108033-20-1

Toluene-4-sulfonic acid (1S,3S,6S,7R)-4-oxo-5-oxa-tricyclo[4.3.0.03,7]non-9-yl ester

B

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
In dichloromethane at 0℃;A 28%
B 60%
81699-64-1

2,2-Dimethyl-3-phenyl-3-(toluene-4-sulfonyloxy)-propionic acid ethyl ester

A

6335-78-0

ethyl isopropylidenephenylacetic carboxylate

B

81699-67-4

ethyl 2-methylene-3-phenylbutanoate

C

104-15-4

toluene-4-sulfonic acid

D

81699-66-3

Ethyl 1-methyl-2-phenylcyclopropane-1-carboxylate

Conditions
ConditionsYield
at 145 - 160℃; Product distribution; Kinetics; Thermodynamic data; Ea(excit.), ΔS(excit.);A 58%
B 6%
C n/a
D 5%
14062-05-6

N,N'-ditosylhydrazine

A

10409-07-1

bis(4-methylphenyl)disulfone

B

1950-69-2

toluene-p-sulfonyl bromide

C

104-15-4

toluene-4-sulfonic acid

Conditions
ConditionsYield
With bromine In water; acetonitrile at 20℃;A 10%
B 57%
C 20%
98435-42-8

3-methoxy-1-methyl-1,2,5,6-tetrahydropyridine

104-15-4

toluene-4-sulfonic acid

135625-83-1

3-methoxy-1-methyl-1,2,5,6-tetrahydropyridinium toluene-p-sulphonate

Conditions
ConditionsYield
In acetone for 0.25h; educt toluene-p-sulphonic acid: anhydrous;100%
104-15-4

toluene-4-sulfonic acid

methyl 2-hydroxy-3-(p-tolylsulfonyloxy)butanoate

Conditions
ConditionsYield
100%
1445-45-0

Trimethyl orthoacetate

104-15-4

toluene-4-sulfonic acid

80-48-8

methyl p-toluene sulfonate

Conditions
ConditionsYield
at 20℃; for 0.5h;100%
In dichloromethane for 0.5h; Ambient temperature;96%
64-17-5

ethanol

63-91-2

L-phenylalanine

104-15-4

toluene-4-sulfonic acid

5002-64-2

Phe-OEt * TosOH

Conditions
ConditionsYield
for 24h; Heating;100%
72-18-4

L-valine

78-83-1

2-methyl-propan-1-ol

104-15-4

toluene-4-sulfonic acid

13018-45-6

(S)-1-isobutoxy-3-methyl-1-oxobutan-2-aminium 4-methylbenzenesulfonate

Conditions
ConditionsYield
In water; toluene for 24h; Reflux; Dean-Stark;100%
In benzene Heating;84%
In benzene Heating;
3240-34-4

[bis(acetoxy)iodo]benzene

104-15-4

toluene-4-sulfonic acid

27126-76-7

[hydroxy(tosyloxy)iodo]benzene

Conditions
ConditionsYield
In acetonitrile100%
for 0.166667h;97%
In acetonitrile at 20℃;94%
89121-14-2

(S)-6-Benzyloxycarbonylamino-2-tert-butoxycarbonylamino-hexanoic acid 2-trimethylsilanyl-ethyl ester

104-15-4

toluene-4-sulfonic acid

89106-04-7

Nε-(Benzyloxycarbonyl)-L-lysine 2-(Trimethylsilyl)ethyl Ester p-Toluenesulfonate

Conditions
ConditionsYield
In benzene for 1h; Heating;100%
104-15-4

toluene-4-sulfonic acid

125376-21-8

(S)-2-tert-Butoxycarbonylamino-propionic acid 6-((S)-2-tert-butoxycarbonylamino-propionyloxy)-hexa-2,4-diynyl ester

125376-29-6

(S)-2-Amino-propionic acid 6-((S)-2-amino-propionyloxy)-hexa-2,4-diynyl ester; compound with toluene-4-sulfonic acid

Conditions
ConditionsYield
With acetic acid at 50℃;100%
104-15-4

toluene-4-sulfonic acid

136185-16-5

Z-L-Leu-L-Lys(Boc)-L-Lys(Boc)-OPh

(S)-2-[(S)-2-((S)-2-Amino-4-methyl-pentanoylamino)-6-tert-butoxycarbonylamino-hexanoylamino]-6-tert-butoxycarbonylamino-hexanoic acid phenyl ester; compound with toluene-4-sulfonic acid

Conditions
ConditionsYield
With hydrogen; palladium on activated charcoal for 1.33333h;100%
104-15-4

toluene-4-sulfonic acid

136185-19-8

Z-L-Ser(tBu)-L-Lys(Boc)-L-Leu-L-Lys(Boc)-L-Lys(Boc)-OPh

136185-33-6

H-L-Ser(tBu)-L-Lys(Boc)-L-Leu-L-Lys(Boc)-L-Lys(Boc)-OPh*TosOH

Conditions
ConditionsYield
With hydrogen; palladium on activated charcoal In N,N-dimethyl-formamide for 1h;100%
104-15-4

toluene-4-sulfonic acid

138541-14-7

Z-L-Glu(OtBu)-L-Lys(Boc)-L-Asn-L-Pro-L-Leu-L-Pro-L-Ser(tBu)-OPh

138541-36-3

H-L-Glu(OtBu)-L-Lys(Boc)-L-Asn-L-Pro-L-Leu-L-Pro-L-Ser(tBu)-OPh*TosOH

Conditions
ConditionsYield
With hydrogen; palladium on activated charcoal In N,N-dimethyl-formamide for 4h;100%
104-15-4

toluene-4-sulfonic acid

138541-04-5

Z-L-Leu-L-Pro-L-Ser(tBu)-OPh

138541-24-9

H-L-Leu-L-Pro-L-Ser(tBu)-OPh*TosOH

Conditions
ConditionsYield
With hydrogen; palladium on activated charcoal In N,N-dimethyl-formamide for 1.5h;100%
104-15-4

toluene-4-sulfonic acid

138541-08-9

Z-L-Thr(tBu)-L-Gln-L-Glu(OtBu)-L-Lys(Boc)-OPh

138541-11-4

H-L-Thr(tBu)-L-Gln-L-Glu(OtBu)-L-Lys(Boc)-OPh*TosOH

Conditions
ConditionsYield
With hydrogen; palladium on activated charcoal In N,N-dimethyl-formamide for 1h;100%
104-15-4

toluene-4-sulfonic acid

88887-52-9

α-<2-(trimethylsilyl)ethyl> γ-n-hexadecyl N-(tert-butyloxycarbonyl)-L-glutamate

88887-54-1

α-<2-(trimethylsilyl)ethyl> γ-n-hexadecyl L-glutamate tosylate

Conditions
ConditionsYield
In benzene for 1h; Heating;100%
104-15-4

toluene-4-sulfonic acid

2,4-Dioxabicyclo[3.3.1]nonane-1,5-diethanol

C25H32O8S2

Conditions
ConditionsYield
100%
104-15-4

toluene-4-sulfonic acid

90934-12-6

nonafluorobutyliodine(III) bis(trifluoroacetate)

155819-09-3

perfluorobutane

Conditions
ConditionsYield
In acetonitrile at 0 - 20℃;100%
In acetonitrile Ambient temperature;91%
In acetonitrile at -20 - 20℃; for 1h;91%
61-90-5

L-leucine

104-15-4

toluene-4-sulfonic acid

100-51-6

benzyl alcohol

1738-77-8

L-leucine benzyl ester p-toluenesulfonate

Conditions
ConditionsYield
In cyclohexane; water for 4h; Dean-Stark; Reflux;100%
In toluene for 20h; Reflux;85%
In toluene for 4h; Reflux; Inert atmosphere;82%
2481-09-6

S-tert-Butyl-N-acetyl-L-cysteine hydrochloride

104-15-4

toluene-4-sulfonic acid

100-51-6

benzyl alcohol

76499-06-4

p-Toluenesulfonate of S-tert-Butyl-L-cysteine Benzyl Ester

Conditions
ConditionsYield
In chloroform for 6h; Heating;100%
104-15-4

toluene-4-sulfonic acid

(+/-)-(3R*,4R*,5S*)-5-((1'S*)-azidopropyl)-3-methyl-4-(phenyldimethylsilyl)-dihydrofuran-2-one

(+/-)-(3R*,4R*,5S*)-5-((1'S*)-aminopropyl)-3-methyl-4-(phenyldimethylsilyl)-dihydrofuran-2-one, p-toluenesulphonic acid

Conditions
ConditionsYield
With hydrogen; palladium on activated charcoal In tetrahydrofuran for 8h;100%
56-41-7

L-alanin

104-15-4

toluene-4-sulfonic acid

100-51-6

benzyl alcohol

42854-62-6

L-alanine benzyl ester p-toluenesulfonate

Conditions
ConditionsYield
In benzene for 10h; Reflux; Inert atmosphere;100%
at 50 - 62℃; under 15.0015 Torr; for 5.5h;98.6%
In cyclohexane; water for 4h; Dean-Stark; Reflux;92%
104-15-4

toluene-4-sulfonic acid

4-[3-oxo-3-thiazol-2-yl-2-(2,2,2-trichloro-ethoxycarbonylamino)-propyl]-piperidine-1-carboxylic acid tert-butyl ester

(2-oxo-1-piperidin-4-ylmethyl-2-thiazol-2-yl-ethyl)-carbamic acid 2,2,2-trichloro-ethyl ester; compound with toluene-4-sulfonic acid

Conditions
ConditionsYield
In diethyl ether at 35℃; for 2h;100%
56-89-3

L-cystine

104-15-4

toluene-4-sulfonic acid

107-18-6

allyl alcohol

L-cystine-bis-allyl ester bis-(toluene-4-sulfonate)

Conditions
ConditionsYield
In benzene at 90℃; for 16h;100%
In benzene for 12h; Esterification; Heating;95%
2432-99-7

11-aminoundecanoic acid

104-15-4

toluene-4-sulfonic acid

100-51-6

benzyl alcohol

11-Aminoundecanoic acid benzyl ester p-toluenesulfonate

Conditions
ConditionsYield
In toluene for 5h; Inert atmosphere; Heating;100%
In benzene for 24h; Reflux;96%
In benzene Esterification;
632-20-2

D-Threonine

104-15-4

toluene-4-sulfonic acid

107-18-6

allyl alcohol

H-D-Thr-Oallyl p-tolunenesulfonate

Conditions
ConditionsYield
In toluene at 140℃; for 24h; Dean-Stark; Schlenk technique; Inert atmosphere;100%
In benzene for 42h; Heating;
104-15-4

toluene-4-sulfonic acid

322407-87-4

2-(2,4,5,8-tetrahydroxy-7-oxa-2-azabicyclo[3.2.1]oct-3-yl)-2-[(O-t-butylcarbonyl)(N-benzyloxycarbonyl)tyrosylamino]acetic acid n-butyl ester

2-(4-hydroxymethyl-1,3,4,5-tetrahydroxy-2-piperidinyl)-2-[(O-t-butylcarbonyl)tyrosylamino]acetic acid n-butyl ester p-toluenesulfonate salt

Conditions
ConditionsYield
With hydrogen; palladium on activated charcoal In methanol for 2h;100%
104-15-4

toluene-4-sulfonic acid

207612-91-7

{tert-butoxycarbonylmethyl-[2-(2,5-dioxo-2,5-dihydro-pyrrol-1-yl)-ethyl]-amino}-acetic acid tert-butyl ester

{carboxymethyl-[2-(2,5-dioxo-2,5-dihydro-pyrrol-1-yl)-ethyl]-amino}-acetic acid; compound with toluene-4-sulfonic acid

Conditions
ConditionsYield
In dichloromethane for 24h;100%
104-15-4

toluene-4-sulfonic acid

445390-52-3

{tert-butoxycarbonylmethyl-[6-(2,5-dioxo-2,5-dihydro-pyrrol-1-yl)-hexyl]-amino}-acetic acid tert-butyl ester

{carboxymethyl-[6-(2,5-dioxo-2,5-dihydro-pyrrol-1-yl)-hexyl]-amino}-acetic acid; compound with toluene-4-sulfonic acid

Conditions
ConditionsYield
In dichloromethane for 24h;100%
104-15-4

toluene-4-sulfonic acid

207612-91-7

{tert-butoxycarbonylmethyl-[2-(2,5-dioxo-2,5-dihydro-pyrrol-1-yl)-ethyl]-amino}-acetic acid tert-butyl ester

{carboxymethyl-[2-(2,5-dioxo-2,5-dihydro-pyrrol-1-yl)-ethyl]-amino}-acetic acid; compound with toluene-4-sulfonic acid

Conditions
ConditionsYield
In dichloromethane100%
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  • Casno:

    104-15-4

    P-Toluenesulfonic acid

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Chemistry

The Molecular Structure of p-Toluenesulfonic acid (CAS NO.104-15-4):

Empirical Formula: C7H8O3S
Molecular Weight: 172.2016 
IUPAC Name: 4-methylbenzenesulfonic acid  
Appearance: Clear colorless to light yellow solution
Product Categories: FINE Chemical & INTERMEDIATES;Organics
Nominal Mass: 172 Da
Average Mass: 172.2016 Da
Monoisotopic Mass: 172.019414 Da 
Index of Refraction: 1.562
Molar Refractivity: 41.72 cm3
Molar Volume: 128.4 cm3
Surface Tension: 48.2 dyne/cm
Density: 1.34 g/cm3 
Boiling point: 116 ºC
Refractive index: 1.3825-1.3845
Flash point: 41 ºC
Storage temp: Flammables area
Water Solubility: soluble
InChI
InChI=1/C7H8O3S/c1-6-2-4-7(5-3-6)11(8,9)10/h2-5H,1H3,(H,8,9,10)
Smiles
S(c1ccc(C)cc1)(O)(=O)=O 
It is abbreviated as TsOH,it is white solid , soluble in water, alcohols, and other polar organic solvents. Most often, TsOH refers to the monohydrate, TsOH.H2O. 

Uses

 p-Toluenesulfonic acid (CAS NO.104-15-4) is used for pharmaceutical, pesticide, dyestuff, also used in plastics and detergent and printing coatings.

Production

 p-Toluenesulfonic acid (CAS NO.104-15-4) is prepared on an industrial scale by the sulfonation of toluene. Common impurities include benzenesulfonic acid and sulfuric acid. Impurities can be removed by recrystallization from concentrated hydrochloric acid followed by azeotropic drying.

Toxicity Data With Reference

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
quail LD50 oral > 316mg/kg (316mg/kg)   Ecotoxicology and Environmental Safety. Vol. 6, Pg. 149, 1982.
rat LD50 oral 2480mg/kg (2480mg/kg)   "Prehled Prumyslove Toxikologie; Organicke Latky," Marhold, J., Prague, Czechoslovakia, Avicenum, 1986Vol. -, Pg. 1055, 1986

Safety Profile

Hazard Codes: CorrosiveC
Risk Statements: 34-10 
R34: Causes burns
R10: Flammable
Safety Statements: 45-26-23 
S45: In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
S23: Do not breathe vapour
RIDADR: 2585
HazardClass: 8
PackingGroup: III

Specification

 p-Toluenesulfonic acid (CAS NO.104-15-4) is also called as 4-Methylbenzenesulfonic acid ; 4-Toluenesulfonic acid ; Benzenesulfonic acid, 4-methyl- ; Toluene sulfonic acid ; 4-Methylbenzenesulfonic acid ; 4-Toluenesulfonic acid ; Benzenesulfonic acid, 4-methyl- ; Eltesol ; Kyselina p-toluenesulfonova ; Methylbenzenesulfonic acid ; Toluenesulfonic acid ; Toluenesulfonic acid (VAN) ; p-Toluene sulfonate ; p-Toluenesulphonic acid ; p-Toluolenesulfonic acid ; Toluene-4-sulphonic acid ; Benzenesulfonic acid, 4-methyl- ; Toluenesulfonic acid ; p-Toluenesulfonic acid .