Reaktion #524463

Reaktionsgleichung

sodium hydroxide

N'-(4-hydroxyphenyl)-N,N-dimethyl urea

2,6-dichloropyridine-N-oxide

→

N'-(4-((6-chloro-2-pyridinyl)oxy)phenyl)-N,N-dimethyl urea-1-oxide

Lösungsmittel

dimethylsulfoxide

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.DISSOLUTIONwas dissolved in 110 ml
2. 2
   workup.WAITAfter this period
3. 3
   Sonstigeabout three-fourths of the solvent carrier was removed by vacuum distillation
4. 4
   Sonstigethe residual oil thus obtained
5. 5
   ExtraktionThe aqueous mixture was extracted with three 250 ml
6. 6
   SonstigeEvaporation of the solvent from the extract
7. 7
   workup.WAITleft a brown, syrupy residue which
8. 8
   Waschenwas washed with cold water

Vorschrift

Dry powdered sodium hydroxide (2.44 grams; 0.061 mole) was dissolved in 110 ml. of warm dimethylsulfoxide and N'-(4-hydroxyphenyl)-N,N-dimethyl urea (11.0 grams; 0.061 mole) and 2,6-dichloropyridine-N-oxide added thereto. The reaction mixture was stirred at a temperature of about 60° C. for a period of 51/2 hours. After this period, about three-fourths of the solvent carrier was removed by vacuum distillation and the residual oil thus obtained poured into ice water. The aqueous mixture was extracted with three 250 ml. portions of warm methylene chloride and the extracts combined. Evaporation of the solvent from the extract left a brown, syrupy residue which was washed with cold water and then with dry benzene to give the desired N'-(4-((6-chloro-2-pyridinyl)oxy)phenyl)-N,N-dimethyl urea-1-oxide compound as a crystalline solid melting at 190°-191° C. and having carbon, hydrogen, nitrogen and chlorine contents of 53.83, 4.63, 13.25 and 12.78 percent, respectively, as compared with contents of 54.64, 4.58, 13.65 and 11.52 percent, respectively, calculated for the named structure.

Quelle