Sulfuric Acid → 2-(2'-Hydroxy-methylphenyl) benzotriazole

HRID 257651

Reaction equation

HRID 257651 reaction equation
[OH-].[Na+].[O:3]=C[C@@H]([C@H]([C@@H]([C@@H](CO)O)O)O)O.O[C:16]1[CH:21]=[CH:20][C:19]([CH3:22])=[CH:18][C:17]=1[N:23]1[N+:27]([O-])=[C:26]2[CH:29]=[CH:30][CH:31]=[CH:32][C:25]2=[N:24]1.S(=O)(=O)(O)O>C1C2C(=O)C3C(=CC=CC=3)C=2C=CC=1.O.CO>[OH:3][C:18]1[C:19]([CH3:22])=[CH:20][CH:21]=[CH:16][C:17]=1[N:23]1[N:27]=[C:26]2[CH:29]=[CH:30][CH:31]=[CH:32][C:25]2=[N:24]1

Participants

8

Reactant 4

HCID 1118Sulfuric AcidHCID 14798Sodium HydroxideHCID 107526(2R,3S,4R,5R)-2,3,4,5,6-pentahydroxyhexanalHCID 132146462-(2-hydroxy-5-methylphenyl)benztriazole N-oxide

Product 1

HCID 135808092-(2'-Hydroxy-methylphenyl) benzotriazoleYield 92.8%

Reagents, catalysts & solvents 3

HCID 10241FluorenoneCatalystHCID 887MethanolSolventHCID 962WaterSolvent

Procedure

To the wet product 12 g (~ 0.4 mol) thus obtained, is added methanol (60 ml), water (30 ml), 97% sodium hydroxide (13.0 g) and 9-fluorenone (0.5 g), and glucose (5.5 g) (0.3 mol) is further added to the mixture over an hour while stirring at 50° to 55° C. The mixture is reacted while stirring at 75° C. (boiling point) for 5 hours. As a result, the N-oxide disappears. The reaction liquor is neutralized with 62% sulfuric acid (19.8 g) to pH 8 to precipitate a crystal. The precipitated crystal is separated by filtration, and the separated crystal is fully washed with water and further with methanol. The washed crystal is then dried, thus obtaining 9.4 g of 2-(2'-hydroxy-methylphenyl) benzotriazole having a melting point of 128 to 130° C. at the yield of 92.8%. One can see that the reduction with aromatic ketones takes over 9 hours to complete. This reduction also required the use of two catalysts and a greater amount of total catalysts.

Workup

  1. additionis further added to the mixture over an hour
  2. customThe mixture is reacted
  3. stirringwhile stirring at 75° C. (boiling point) for 5 hours
  4. customto precipitate a crystal
  5. customThe precipitated crystal is separated by filtration
  6. washthe separated crystal is fully washed with water and further with methanol
  7. customThe washed crystal is then dried

Sources & evidence

ORD record
ord-adf81cdb482147bb8d95ef8e5d349c21
Source dataset
uspto-grants-1993_11
Patent number
US05262541

Linked notes

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