Methanol → Methyl 7-methyl-9H-xanthene-2-carboxylate

HRID 1658553Notes

Reaction equation

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

Participants

Conditions

Temperature: 40 °C

Procedure

Twenty-six grams of 7-methylxanthene-2-carboxylic acid is added to 400 ml. of absolute methanol. To the resultant solution are added 18 ml. of concentrated sulfuric acid and the mixture is then heated at reflux for about two hours. The mixture is then cooled to 40°C and sufficient water is added to bring the total volume to 1400 ml. The resultant mixture is then filtered to give methyl 7-methylxanthene-2-carboxylate.

Workup

temperatureat reflux for about two hours
filtrationThe resultant mixture is then filtered

Sources & evidence

ORD record: ord-ec23fa05a1c048889a3a63d776f77737
Source dataset: uspto-grants-1976_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US03965115

Reaction notes

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