Formaldehyde → 4-(5-Cyclohexyl-1,3,4-thiadiazol-2-yl)-2-methyl-1,2,4-triazolidin-3-one

HRID 435916Notes

Reaction equation

HRID 435916 reaction equation
[CH3:1][N:2]([C:4]([NH:6][C:7]1[S:8][C:9]([CH:12]2[CH2:17][CH2:16][CH2:15][CH2:14][CH2:13]2)=[N:10][N:11]=1)=[O:5])[NH2:3].[CH2:18]=O.[OH-].[K+]>CO>[CH3:1][N:2]1[C:4](=[O:5])[N:6]([C:7]2[S:8][C:9]([CH:12]3[CH2:17][CH2:16][CH2:15][CH2:14][CH2:13]3)=[N:10][N:11]=2)[CH2:18][NH:3]1

Participants

5

Reactant 3

HCID 712FormaldehydeHCID 14797Potassium HydroxideHCID 21454603N-(5-Cyclohexyl-1,3,4-thiadiazol-2-yl)-1-methylhydrazine-1-carboxamide

Product 1

HCID 214546204-(5-Cyclohexyl-1,3,4-thiadiazol-2-yl)-2-methyl-1,2,4-triazolidin-3-one

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

2-Methyl-4-(5-cyclohexyl-1,3,4-thiadiazol-2-yl)-semicarbazide (0.1 mole) dissolved in methanol (100 ml) is charged into a glass reaction vessel equipped with a mechanical stirrer and thermometer. Aqueous formaldehyde (0.2 mole; 37% concentration) is then added to the reaction vessel with stirring. Dilute aqueous potassium hydroxide is added to the reaction mixture to adjust the pH to between 7 and 8 and stirring is continued for a period of about 20 minutes resulting in the formation of a solid precipitate. The precipitate is recovered by filtration, is recrystallized and is dried under vacuum to yield the desired product 2-methyl-4-(5-cyclohexyl-1,3,4-thiadiazol-2-yl)-1,2,4-triazolidin-3-one.

Workup

  1. additionis charged into a glass reaction vessel
  2. customequipped with a mechanical stirrer
  3. stirringstirring
  4. customresulting in the formation of a solid precipitate
  5. filtrationThe precipitate is recovered by filtration
  6. customis recrystallized
  7. customis dried under vacuum

Sources & evidence

ORD record
ord-43dcaaabe0e048c580442a2d764ddfa5
Source dataset
uspto-grants-1977_02
Patent number
US04007031

Reaction notes

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