Hydrochloric Acid → 3-(2H-tetrazol-5-yl)-phenylamine hydrochloride

HRID 2379315Notes

Reaction equation

HRID 2379315 reaction equation
[N+:1]([C:4]1[CH:5]=[C:6]([C:10]2[NH:14][N:13]=[N:12][N:11]=2)[CH:7]=[CH:8][CH:9]=1)([O-])=O.[ClH:15]>C(O)C.[Pd]>[ClH:15].[NH2:1][C:4]1[CH:5]=[C:6]([C:10]2[NH:14][N:13]=[N:12][N:11]=2)[CH:7]=[CH:8][CH:9]=1

Participants

5

Reactant 2

HCID 313Hydrochloric AcidHCID 2851295-(3-nitrophenyl)tetrazole

Product 1

HCID 212019913-(2H-tetrazol-5-yl)-phenylamine hydrochlorideYield 71%

Reagents, catalysts & solvents 2

HCID 23938PalladiumCatalystHCID 702EthanolSolvent

Procedure

To a solution of 5-(3-nitrophenyl)tetrazole (22 g, 0.12 mol) in ethanol (500 ml) was added 10% palladium on carbon (1.5 g, 7% (w/w)) in hydrochloric acid (23 ml of a 5M solution). The mixture was hydrogenated at 40 psi for 10 min, then the catalyst filtered off and washed with water. The solvents were evaporated in vacuo and the brown solid azeotroped with toluene (4×100 ml). The resulting solid was triturated with hot ethanol to give 5-(3-aminophenyl)tetrazole hydrochloride (16.3 g, 71%) as a beige powder. mp 203°-205° C. 1H NMR (360 MHz, D2O) δ 7.63 (1H, d, J=9 Hz), 7.75 (1H, t, J=8 Hz), 8.00 (2H, m).

Workup

  1. filtrationthe catalyst filtered off
  2. washwashed with water
  3. customThe solvents were evaporated in vacuo
  4. customthe brown solid azeotroped with toluene (4×100 ml)
  5. customThe resulting solid was triturated with hot ethanol

Sources & evidence

ORD record
ord-b21c516b9d2245999815a208cec22791
Source dataset
uspto-grants-1994_11
Patent number
US05360802

Reaction notes

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