Sulfuric Acid → HCID 73663468, compound

HRID 845288Notes

Reaction equation

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

Participants

Reactant 2

HCID 1118Sulfuric Acid

HCID 73186205HCID 73186205, compound

Product 1

HCID 73663468HCID 73663468, compound

Procedure

345 parts of the dry 2-(2-benzylidenehydrazino)-4-(2-hydroxyethylsulfonyl)-benzenesulfonic acid are added to 1000 parts of sulfuric acid (monohydrate); after quantitative esterification (after 10 h) the mixture is added to 2500 parts of ice. 2-(2-Benzylidenehydrazino)-4-(2-sulfoethylsulfonyl)-benzenesulfonic acid can then be isolated therefrom by precipitation with sodium chloride or be obtained as an aqueous neutral solution by bringing this acid solution to a pH of 5 with 900 parts of calcium carbonate and about 100 parts of sodium carbonate and at 60° C. filtering off the calcium sulfate with suction.

Workup

additionafter quantitative esterification (after 10 h) the mixture is added to 2500 parts of ice

Sources & evidence

ORD record: ord-d982992003e54762bc2a33a79541bcd5
Source dataset: uspto-grants-1988_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04757135

Reaction notes

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