Dithiobenzoic acid

Chemical compound From Wikipedia, the free encyclopedia

Dithiobenzoic acid

Dithiobenzoic acid is the organosulfur compound with the formula C6H5CS2H. It is a dithiocarboxylic acid, an analogue of benzoic acid, but more acidic and deeply colored.

Quick Facts Names, Identifiers ...
Dithiobenzoic acid
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Names
Preferred IUPAC name
Benzenecarbodithioic acid
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.004.084
EC Number
  • 204-491-4
UNII
  • InChI=1S/C7H6S2/c8-7(9)6-4-2-1-3-5-6/h1-5H,(H,8,9)
    Key: ZGRWZUDBZZBJQB-UHFFFAOYSA-N
  • C1=CC=C(C=C1)C(=S)S
Properties
C7H6S2
Molar mass 154.25 g·mol−1
Appearance dark red sticky solid or viscous oil
Acidity (pKa) 1.92[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Synthesis and reactions

It can be prepared by sulfiding benzotrichloride:[2]

C6H5CCl3 + 4 KSH → C6H5CS2K + 3 KCl + 2 H2S
C6H5CS2K + H+ → C6H5CS2H + K+

It also arises by the reaction of the Grignard reagent phenylmagnesium bromide with carbon disulfide, followed by acidification:[3]

C6H5MgBr + CS2 → C6H5CS2MgBr
C6H5CS2MgBr + HCl → C6H5CS2H + MgBrCl

It is about 100x more acidic than benzoic acid. Its conjugate base, dithiobenzoate, undergoes S-alkylation to give dithiocarboxylate esters.[2] Similarly, dithiobenzoate reacts with "soft" metal salts to give complexes, e.g. Fe(S2CC6H5)3 and Ni(S2CC6H5)2.

Chlorination of dithiobenzoic acid gives the thioacyl chloride C6H5C(S)Cl.

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Structure of the trimer [Ni(S2CPh)2]3.[4]

References

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