Cinnolinesulfonic acids

The term thiocinnoline includes any cinnoline bearing a sulfur-containing substituent that is joined directly or indirectly to the nucleus through its sulfur atom cinnolinethiones (tautomeric and nontautomeric), alkylthiocinnolines, alkyl-sulfinylcinnolines, alkylsulfonylcinnolines, cinnolinesulfonic acids (and derivatives), dicinnolinyl sulfides and disulfides, and the hke. So little information on thiocinnolines has emerged from the 1972-2004 literature that this chapter is necessarily brief. 

Also other examples using unisolated sulfones as substrates. Cinnolinesulfonic Acids and Derivatives... 

Note. The primary syntheses of a cinnolinesulfonic acid and of several sulfonamides and sulfonanihdes" have been covered in Section 1.2.1. 

Chloro-4-oxo-1,4-dihydro-3-cinnolinecarboxylic acid 5-Chloro-4-oxo-l,4-dihydro-8-cinnolinesulfonic acid... 

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