Process Research of 1-(3,4-Dichloropheny)-3-Methyl-Pyrazolone-5-one Synthesis
2012 ◽
Vol 450-451
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pp. 223-227
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Keyword(s):
The new process of 1-(3,4-dichloropheny)-3-methyl-pyrazolone-5-one (34DCPMP) synthesis had been discovered, which using 3,4-dichloro phenylhydrazine hydrochloride(DCPH) and ethyl acetoacetate as the raw material , The product was obtained by the route during cyclization in aqueous medium. The structure of products was confirmed by 1HNMR, 13CNMR and IR. The effects of factors on the yield of products were investigated. It was found that the yield of 34DCPMP can reach 98.7% under the optimal reaction condition of n(34DCPH):n(ethyl acetoacetate) with 1:1.1, n(34DCPH):n(Na2SO3) with 1.3:1 at 80°C, and pH 7.5 for 3h. The chromatographic purity can be higher than 98.2%.
2012 ◽
Vol 209-211
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pp. 1774-1777
Keyword(s):
2012 ◽
Vol 602-604
◽
pp. 1269-1273
2019 ◽
Vol 8
(1)
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pp. 846-855
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Keyword(s):
2011 ◽
Vol 287-290
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pp. 1360-1364