The present invention relates to a compound of the formula (I)
1
wherein
R
1
is an unsubstituted or substituted hydrocarbon radical having a total of 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms,
R
2
is an unsubstituted or substituted hydrocarbon radical having a total of 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms, or the group
NR
1
R
2
is a heterocyclic ring having 3 to 8 ring atoms which is unsubstituted or substituted and contains the nitrogen atom of the group NR
1
R
2
as ring heteroatom and may also contain one or two further ring heteroatoms from the group consisting of N, O and S, and
Q is H or a cation.
The compounds of the present invention can advantageously be used for the preparation of sulfonylureas and their precursors such as sulfochlorides or sulfonamides.
Process for preparing 2-carboxy-5-nitrobenzenesulfonic acid and salts
申请人:Hoechst Schering AgrEvo GmbH
公开号:US06127572A1
公开(公告)日:2000-10-03
The invention is directed to a simple process for the preparation of the product 2-carboxy-5-nitrobenzenesulfonic acid (=4-nitro-2-sulfo-benzoic acid) or a salt thereof. The product can be prepared by the oxidation reaction of 2-methyl-5-nitrobenzenesulfonic acid with metal hypochlorites in the presence of metal bases from the group consisting of hydroxides and carbonates, essentially with the exclusion of heavy metal salts.
[EN] METHOD FOR PREPARATION OF POTASSIUM 5-IODO-2-CARBOXYBENZENE SULFONATE<br/>[FR] PROCÉDÉ DE PRÉPARATION DE 5-IODO-2-CARBOXY BENZÈNE SULFONATE DE POTASSIUM
申请人:LONZA AG
公开号:WO2020064753A1
公开(公告)日:2020-04-02
The invention discloses a method for the preparation of potassium 5-iodo-2-carboxybenzene sulfonate by diazotization of 5-amino-2-carboxybenzene sulfonate and subsequent reaction with KI.