反应详情

To a stirring suspension of 7.92 g (0.07 mole) of creatinine in 50 ml of dry DMF is added 9.08 g (0.05 mole) of 3-chloro-2,6-dimethylphenyl isocyanate. After stirring for four hours, the reaction mixture is filtered through a diatomaceous earth pad to remove unreacted creatinine. Addition of a large excess of ice water precipitates a gummy semisolid mass which eventually crystallizes. After blowing the product to dry it for about eighteen hours, it is recrystallized from acetone-ether. Finally the product is taken up in dichloromethane and the resulting solution is filtered through diatomaceous earth. Concentration and dilution with ether gives pure product, 1-(3-chloro-2,6-dimethylphenyl)-3-(1-methyl-4-oxo-2-imidazolidinylidene) urea; m.p. 140°-141.5° C.

1. filtrationthe reaction mixture is filtered through a diatomaceous earth pad
2. customto remove unreacted creatinine
3. additionAddition of a large excess of ice water
4. customprecipitates a gummy semisolid mass which
5. customeventually crystallizes
6. customto dry it for about eighteen hours
7. customit is recrystallized from acetone-ether
8. filtrationthe resulting solution is filtered through diatomaceous earth
9. concentrationConcentration and dilution with ether