PTSA

para-toluenesulfonic acid

p-Methylbenzenesulfonic AciD

Molecular Formula: C₇H₈O₃S 

Molecular Weight: 172.2 

IH NMR

1H NMR	399.65 MHz
C7 H8 O3 S	0.038 g : 0.5 ml DMSO-d6
p-toluenesulfonic acid

---

Assign. Shift(ppm) A 7.530 B 7.170 C 6.57 D 2.302

13C NMR	22.53 MHz
C7 H8 O3 S	0.038 g : 0.5 ml DMSO-d6
p-toluenesulfonic acid

---

ppm Int. Assign. 144.20 166 1 138.49 213 2 128.25 1000 3 125.45 962 4 20.69 437 5

13C NMR	25.16 MHz
C7H8O3S	0.35 g : 1.5 ml D2O
p-toluenesulfonic acid

---

ppm Int. Assign. 142.97 306 1 140.97 188 2 130.15 1000 3 126.28 886 4 21.25 232 5

Mass

p-toluenesulfonic acid
C7H8O3S H2O         (Mass of molecular ion:    172)

• Mass spectrum (electron ionization)  click here

   Source Temperature: 240 °C
   Sample Temperature: 140 °C
   DIRECT, 75 eV

18.0       1.2
      27.0       2.3
      28.0       1.3
      38.0       1.9
      39.0      14.2
      40.0       1.2
      41.0       4.0
      50.0       3.9
      51.0       6.7
      52.0       2.0
      53.0       2.4
      62.0       3.0
      63.0       9.7
      64.0       3.0
      65.0      31.8
      66.0       1.9
      77.0      14.8
      78.0       2.1
      79.0      15.6
      80.0       3.5
      89.0      10.4
      90.0      10.8
      91.0     100.0
      92.0       8.5
     107.0      40.6
     108.0      27.8
     109.0       2.2
     155.0       4.7
     172.0      74.4
     173.0       6.4
     174.0       3.8

ir

SEE WHAT HAPPENS ON METHYLATION

EXTRA METHYL APPEARS

Shift (ppm)
145.2	128.0
132.2	56..5
130.2	21.4

FIRST SIGNAL IS Ar- CH3

second one is -OCH3