34701-72-9

Basic information

• Product Name: 2H-1-Benzopyran-3-carbonitrile, 6-hydroxy-2-oxo-
• Synonyms: 3-Cyan-6-hydroxy-cumarin;6-hydroxy-2-oxo-2H-chromene-3-carbonitrile;3-cyano-6-hydroxycoumarin;2H-1-Benzopyran-3-carbonitrile,6-hydroxy-2-oxo
• CAS NO: 34701-72-9
• Molecular Formula: C10H5NO3
• Molecular Weight: 187.15200
• Mol File: 34701-72-9.mol
• Article Data: 7

Chemical Properties

• CAS DataBase Reference: 2H-1-Benzopyran-3-carbonitrile, 6-hydroxy-2-oxo-(CAS DataBase Reference)
• NIST Chemistry Reference: 2H-1-Benzopyran-3-carbonitrile, 6-hydroxy-2-oxo-(34701-72-9)
• EPA Substance Registry System: 2H-1-Benzopyran-3-carbonitrile, 6-hydroxy-2-oxo-(34701-72-9)

Safety Data

• Hazardous Substances Data: 34701-72-9(Hazardous Substances Data)

Upstream product

• 1194-98-5 2,5-Dihydroxybenzaldehyde 
• 105-56-6 ethyl 2-cyanoacetate 
• 109-77-3 malononitrile 
• 303063-73-2 6-hydroxy-2-imino-2H-chromene-3-carbonitrile 

Downstream Products

• 56437-16-2 6-hydroxycoumarin-3-carboxylic acid 

Relevant articles and documents

One-Pot Green Synthesis of 2-Oxo-2H-chromene-3-carbonitriles Using Dual-Frequency Ultrasonication

Abstract: A green synthesis of 2-oxo-2H-chromene-3-carbonitriles has been carried out in one step by reacting 2-hydroxybenzaldehydes or 2-hydroxyacetophenones with ethyl cyanoacetate under dual-frequency ultrasonica-tion (ultrasonic bath of 40 KHz and probe of 20 KHz). The compounds were obtained in very high yield, and their structures were confirmed by IR and NMR data.

ZrCl4/[bmim]BF4-catalyzed condensation of salicylaldehydes and malononitrile: Single-step synthesis of 3-cyanocoumarin derivatives

Figure represented. A versatile and efficient single-step route to 3-cyanocoumarins via Knoevenagel condensation of salicylaldehydes and malononitrile using ZrCl4 as the catalyst (15 mol %) in ionic liquid 1-(n-butyl)-3-methylimidazolium tetrafluoroborate as reaction medium and catalyst is described. The novel procedure features single step, short reaction time, good yields, and simple workup.

Synthesis of new iminocoumarins and their transformations into N-chloro and hydrazono compounds

The Knoevenagel reaction between 2-hydroxybenzaldehydes and active methylene compounds (malononitrile and ethyl cyanoacetate) produces iminocoumarins and/or coumarins. In order to study the reactivity of the prepared iminocoumarins, chlorination and reaction with N-nucleophiles were studied.