Substitution of a nitro group by formyl
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T. Ya. Mozhaeva; O. L. Samsonova; V. L. Savel'ev
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Article
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1988
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Springer US
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English
⚖ 38 KB
Heating 3,6-dinitro-4-chlorocoumarin (I) with excess phosphorus oxychloride in absolute DMF unexpectedly led to two novel products, viz. 3-formyl-4-chloro-6-nitrocoumarin (II, mp 172-174~ and3,4-dichloro-6-nitrocoumarin (III, mp 168~IZ0~ which could be separated chromatographically on silica gel. Si