Benzoic Acid → Benzoic Acid

HRID 2058117Notes

Reaction equation

[C:1]1(=[O:11])[O:6][C:4](=[O:5])[C:3]2=[CH:7][CH:8]=[CH:9][CH:10]=[C:2]12.[C:12]1([C:21]2[C:16](=[CH:17][CH:18]=[CH:19][CH:20]=2)[CH2:15][O:14]1)=[O:13].[C:22]([OH:30])(=[O:29])[C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1>>[C:1]1(=[O:11])[O:6][C:4](=[O:5])[C:3]2=[CH:7][CH:8]=[CH:9][CH:10]=[C:2]12.[C:12]1([C:21]2[C:16](=[CH:17][CH:18]=[CH:19][CH:20]=2)[CH2:15][O:14]1)=[O:13].[C:22]([OH:30])(=[O:29])[C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1.[C:2]1([CH3:1])[C:3]([C:4]([OH:6])=[O:5])=[CH:7][CH:8]=[CH:9][CH:10]=1

Participants

Reactant 3

HCID 243Benzoic Acid

HCID 6811Phthalic Anhydride2×

HCID 6885Phthalide2×

Product 4

HCID 243Benzoic Acid

HCID 6811Phthalic Anhydride

HCID 6885Phthalide

HCID 83732-Methylbenzoic acid

Procedure

The reflux liquid moves from the rectification zone down through said contact with the feed vapor mixture to a stripping zone wherein the reflux liquid carrying phthalic anhydride condensate as dissolved liquid and/or solvent becomes enriched with respect thereto and with respect to benzoic and o-toluic acids and phthalide. The reflux liquid containing phthalic anhydride, benzoic acid, otoluic acid and phthalide is heated to a temperature which vaporizes the reflux liquid but not phthalic anhydride but rather the heating leaves the anhydride as a liquid in which phthalide, benzoic acid and o-toluic acid become dissolved.

Workup

dissolutionas dissolved liquid and/or solvent
temperatureis heated to a temperature which

Sources & evidence

ORD record: ord-7a8cd999eb184b2bb5efb5eb43ff7cc1
Source dataset: uspto-grants-1980_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04215054

Reaction notes

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