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- W2374933228 abstract "The new process of preparing pyrimidine which is widely used as pharmaceutical intermediate was studied.Beginning from the raw material——urea and diethyl malonate,barbituric acid was prepared with sodium methoxide as catalyst,then 2,4,6-trichloropyrimidine was synthesized by reacting of barbituric acid with phosphorus oxychloride in the presence of N,N-dimethylaniline.The object compound was prepared from 2,4,6-trichloropyrimidine by catalytic hydrogenation with palladium-charcoal as catalyst.The optimum reaction conditions for every reaction step were studied.For preparing barbituric acid,the mole ratio of diethyl malonate,urea and sodium methoxide was 1∶1.1∶1.2,and the mixture was refluxed 2 hours;for preparing 2,4,6-trichloropyrimidine,the mole ratio of phosphorus oxychloride and barbituric acid was 5∶1,and the reaction was run at 100~105 °C for 2 hours;for preparing pyrimidine,the mole ratio of magnesium oxide and 2,4,6-trichloropyrimidine was 5∶1,the volume ratio of water and ethanol was 3∶1 and the reaction was run at 0.1 MPa and 60 °C for 14 hours." @default.
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- W2374933228 date "2009-01-01" @default.
- W2374933228 modified "2023-09-26" @default.
- W2374933228 title "Study on New Process of Synthesizing Pyrimidine" @default.
- W2374933228 hasPublicationYear "2009" @default.
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