Thiosalicylic acid

2- mercaptobenzoic

Light yellow, malodorous solid

Fixed

164-165 ° C

Attention

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Thiosalicylic acid is a sulfur analogue of salicylic acid, the phenolic hydroxy group is replaced by a thiol group ( mercapto group ).

Production and representation

The synthesis is carried out by the reaction of 2-chloro- or 2- bromobenzoic acid with sodium hydrogen sulfide or potassium hydrogen sulfide in the presence of copper. The reduction of dithiosalicylic also provides thiosalicylic.

Properties

Atmospheric oxygen oxidizes Thiosalycilsäure to dithiosalicylic ( a disulfide ). Dithiosalicylic also forms when it is mixed with an alcoholic solution of thiosalicylic iron (III ) chloride.

Use

The pure red vat dye Thioindigo was first synthesized from thiosalicylic.