Sulfuric Acid → 4,5-Dimethyl-6-oxo-7-isopropyl-7,8-dihydro-6H-indeno[5,4-b]furan-2-carboxylic acid

HRID 1579625Notes

Reaction equation

HRID 1579625 reaction equation
[CH2:1]=[C:2]([CH:19]([CH3:21])[CH3:20])[C:3]([C:5]1[C:6]([CH3:18])=[C:7]([CH3:17])[C:8]2[O:12][C:11]([C:13]([OH:15])=[O:14])=[CH:10][C:9]=2[CH:16]=1)=[O:4].S(=O)(=O)(O)O>>[CH3:17][C:7]1[C:8]2[O:12][C:11]([C:13]([OH:15])=[O:14])=[CH:10][C:9]=2[C:16]2[CH2:1][CH:2]([CH:19]([CH3:21])[CH3:20])[C:3](=[O:4])[C:5]=2[C:6]=1[CH3:18]

Participants

3

Reactant 2

HCID 1118Sulfuric AcidHCID 21568960HCID 21568960, compound

Product 1

HCID 215689444,5-Dimethyl-6-oxo-7-isopropyl-7,8-dihydro-6H-indeno[5,4-b]furan-2-carboxylic acid

Conditions

Temperature
57 °C

Procedure

A mixture of 5-(2-methyleneisovaleryl)-6,7-dimethylbenzofuran-2-carboxylic acid (5 g.) and concentrated sulfuric acid (25 ml.) is heated at 57°C. for 6 hours and poured into ice water (300 ml.). The 4,5-dimethyl -6-oxo-7-isopropyl-7,8-dihydro-6H-indeno-[5,4-b]furan-2-carboxylic acid which separates is filtered and dried.

Workup

  1. filtrationThe 4,5-dimethyl -6-oxo-7-isopropyl-7,8-dihydro-6H-indeno-[5,4-b]furan-2-carboxylic acid which separates is filtered
  2. customdried

Sources & evidence

ORD record
ord-c9d036b60cb34614b581c70841babc6c
Source dataset
uspto-grants-1976_01
Patent number
US03931239

Reaction notes

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