- A 3 - bromo -2 - nitrobenzaldehyde chemical synthesis method
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The invention relates to a chemical synthesis method of 3-bromo-2-nitrobenzaldehyde. The chemical synthesis method is characterized by using 1,3-dibromo-2-nitrobenzene as a raw material and carrying out five-step reactions including substitution, decarboxylation, oxidation, reduction and hydroformylation, and comprises the following steps of adding 1,3-dibromo-2-nitrobenzene, dimethyl malonate and alkali to an organic solvent to react to prepare 2-(3-bromo-2-nitrobenzaldehyde)-dimethyl malonate; dissolving 2-(3-bromo-2-nitrobenzaldehyde)-dimethyl malonate obtained in the former step in a tetrahydrofuran or acetone solvent, and adding a hydrochloric acid solution to react to prepare 2-(3-bromo-2-nitrobenzaldehyde)-acetic acid; adding a sodium hydroxide water solution and potassium permanganate to react to obtain 3-bromo-2-nitrobenzoic acid; dissolving 3-bromo-2-nitrobenzoic acid in the tetrahydrofuran solvent, and adding borane tetrahydrofuran to react to obtain 3-bromo-2-nitrobenzyl alcohol; adding 3-bromo-2-nitrobenzyl alcohol to a dichloromethane or 1,2-dichloroethane solvent and adding manganese dioxide to react to prepare 3-bromo-2-nitrobenzaldehyde. The synthetic route has the advantages of low cost and high yield.
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Paragraph 0024; 0031-0032; 0043; 0054
(2018/07/15)
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- Reexamination of the bromination of 2-nitrobenzaldehyde with NBS or NaBr-NaIO4 in sulfuric acid
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Two literature procedures for selective bromination of 2-nitrobenzaldehyde using N-bromosuccinimide (NBS) or NaBr-NaIO4 in sulfuric acid were examined. In contrast to the reports that 4-bromo-2-nitrobenzaldehyde is formed as a single product in good yield, reactions using NBS gave a number of isomeric mono- and dibrominated products identified by spectroscopical methods and by sodium borohydride reduction to the corresponding benzyl alcohol, and reactions using NaBr-NaIO4 did not furnish any product. [Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications for the following free supplemental resource(s): Full experimental and spectral details.]
- Cummings, Matthew M.,Soederberg, Bjoern C. G.
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supporting information
p. 954 - 958
(2014/03/21)
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- Tunable emissive thin films through ICT photodisruption of nitro-substituted triarylamines
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UV-assisted photocleavage in the solid state of orange emitting nitro-substituted triarylamines leads to the appearance of blue emission following photodisruption of the ICT state.
- Jacquart, Aurelie,Tauc, Patrick,Pansu, Robert B.,Ishow, Elena
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supporting information; experimental part
p. 4360 - 4362
(2010/08/22)
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