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[求助]
请问后一句怎么去理解呢，到底是要不要在甲醇里面结晶呢？应该怎么结晶呢，在线等
(VI) was prepared by reacting equimolar portions of l,l0-phenanthroline hydrate and bromoacetaldehyde 2,4-dinitrophenyl-hydrazoner z in benzene soln at 60° for 1 hr with vigorous agitation. The yellow salt, m.p. 196-200” (with dec), yield =92%, which precipitated was collected after 3 days and was used in the next stage of the synthesis without further purification. It was difficult to crystallize but an analytical sample of the monohydrate was obtained from aqueous MeOH as yellow crystals, m.p. 205-208” (with dec). |
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博士读完未来一定会好吗
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