6635-20-7Relevant articles and documents
Method for producing entacapone
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Paragraph 0041-0049, (2021/04/10)
The present invention relates to an entacapone production method, which comprises a nitration reaction, a de-methylation reaction and a condensation reaction. The nitration reaction is completed by glacial acetic acid, vanillin and 65% nitric acid within 3-5 hours; the de-methylation reaction is completed by reaction among nitrovanillin, dichloromethane, tetrabutyl ammonium bromide, anhydrous aluminum chloride and pyridine; and the condensation reaction is completed by reaction among isopropanol, 3,4-dihydroxyl-5-nitro benzaldehyde, N,N-diethyl cyanoacetamide and piperidine. The entacapone production method provided by the invention is high in yield, high in purity and stable in quality.
Copper-mediated nitrosation: 2-nitrosophenolato complexes and their use in the synthesis of heterocycles
Nicholls, Alexander J.,Batsanov, Andrei S.,Baxendale, Ian R.
, (2019/11/28)
A simple protocol yielding ortho-substituted nitrosophenols from phenols is demonstrated, in the form of copper(II) bis(nitrosophenolato) complexes. The developed methodology was applied to a range of substrates, confirming the role of the copper in both the formation and protection of the challenging 1, 2-substitution pattern. Using polymer supported thiourea, the Cu could be stripped from the complexes and thus enabled the isolation or identification of the uncoordinated ligands and their decomposition products, in yields generally low in line with the intrinsic high reactivity of 2-nitrosophenols. The product complexes are useful intermediates as demonstrated in revisiting a formal [4 + 2] cycloaddition with dimethylacetylene dicarboxylate to synthesise bicyclic products in variable yields, revealing the product has a novel structure different from those previously reported in the literature.
a naked-eye colorimetric receptor for anions based on nitro group featuring with benzimidazole unit
Rahmawati,Purwono,Matsjeh
, p. 1933 - 1936 (2018/08/09)
A novel receptor based on nitro group featuring with benzimidazole unit (S2) was successfully synthesized and applied to the anion (CN–, F–and H2PO4–) recognition. The S2 changed its colour for light yellow to dark yellow on addition of the anions in DMSO solvent. The LOD and Kass values determined by UV-visible titration was 2.8 × 10–6 M and 1.2 (± 0.25) × 106 M–1 for CN– ion; 1.14 × 10–6 M and 2.5 (± 0.25) × 106 M–1 for F– ion; and 1.23 × 10–5 M and 6.25 (± 0.177) × 106 M–1 for H2PO4– ion, respectively.
