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CAS No.: | 4732-72-3 |
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Name: | Benzofuran-2,3-dione |
Article Data: | 11 |
Molecular Structure: | |
Formula: | C8H4O3 |
Molecular Weight: | 148.118 |
Synonyms: | 2,3-benzofuranedione;3-oxobenzofuran-2-one;Coumarandione;2,3-dihydro-2,3-benzo[b]furandione;2,3-Benzofurandione;benzo[b]furan-2,3-dione;Benzofuran-2,3-dione;2,3-dihydrobenzofuran-2,3-dione; |
Density: | 1.444 |
Melting Point: | 120oC |
Boiling Point: | 278.1°C at 760 mmHg |
Flash Point: | 132.9°C |
PSA: | 43.37000 |
LogP: | 0.78830 |
coumarandione
Conditions | Yield |
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With hydrogenchloride; acetic acid In water Heating; | 87% |
coumarandione
Conditions | Yield |
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With N-chloro-succinimide; silver nitrate In acetonitrile at 0℃; for 0.0833333h; | 50% |
Conditions | Yield |
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Stage #1: indole-2,3-dione With sodium hydroxide; sodium nitrite In water Cooling with ice; Stage #2: With sulfuric acid In water at 60℃; Cooling with ice; | 46% |
Multi-step reaction with 2 steps 1.1: sodium hydroxide / water / 20 °C 1.2: 2.25 h / 0 - 60 °C 2.1: phosphorus pentoxide / toluene / 6 h / Reflux; Dean-Stark View Scheme |
(2-hydroxyphenyl)oxoacetic acid
coumarandione
Conditions | Yield |
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With acetic anhydride for 0.0833333h; Heating; | 29% |
bei der Destillation unter vermindertem Druck; | |
With phosphorus pentaoxide; Petroleum ether | |
With acetic anhydride Heating; | |
With phosphorus pentoxide In toluene for 6h; Reflux; Dean-Stark; |
2,2'-bi-benzofuranylidene-3,3'-dione
coumarandione
Conditions | Yield |
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With chromic acid |
Conditions | Yield |
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Multi-step reaction with 2 steps 1: SeO2 2: Ac2O / Heating View Scheme |
2-trifluoromethylsulfonyloxybenzoic acid ethyl ester
coumarandione
Conditions | Yield |
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Multi-step reaction with 2 steps 1.1: n-butyllithium / hexane; tetrahydrofuran / 0.67 h / -40 - -20 °C / Inert atmosphere 1.2: -78 - 25 °C / Inert atmosphere 2.1: N-chloro-succinimide; silver nitrate / acetonitrile / 0.08 h / 0 °C View Scheme |
Conditions | Yield |
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Multi-step reaction with 3 steps 1.1: sodium hydride / dichloromethane; mineral oil; hexane / 0 °C / Inert atmosphere 1.2: -78 °C / Inert atmosphere 2.1: n-butyllithium / hexane; tetrahydrofuran / 0.67 h / -40 - -20 °C / Inert atmosphere 2.2: -78 - 25 °C / Inert atmosphere 3.1: N-chloro-succinimide; silver nitrate / acetonitrile / 0.08 h / 0 °C View Scheme |
3-Formylchromone
coumarandione
Conditions | Yield |
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Multi-step reaction with 2 steps 1: sodium nitrite; dipotassium peroxodisulfate / acetone / 20 °C / Green chemistry 2: acetic acid; hydrogenchloride / water / Heating View Scheme |
Conditions | Yield |
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In toluene at 20℃; under 6000600 Torr; for 12h; Hetero Diels-Alder reaction; | 90% |