Chemistry:4,5-Dichloro-1,2,3-dithiazolium chloride

4,5-Dichloro-1,2,3-dithiazolium chloride

Names
Other names Appel's salt
Identifiers
CAS Number	75318-43-3
3D model (JSmol)	Interactive image
ChemSpider	9270989
PubChem CID	11095847
UNII	156NP9484D
InChI InChI=1S/C2Cl2NS2.ClH/c3-1-2(4)6-7-5-1;/h;1H/q+1;/p-1 Key: NIZMCFUMSHISLW-UHFFFAOYSA-M
SMILES C1(=NS[S+]=C1Cl)Cl.[Cl-]
Properties
Chemical formula	C2Cl3NS2
Molar mass	208.50 g·mol−1
Appearance	green solid
Melting point	172 °C (342 °F; 445 K) decomposition
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

4,5-Dichloro-1,2,3-dithiazolium chloride (Appel's salt) is an organosulfur compound. It is the chloride salt of the 4,5-dichloro-1,2,3-dithiazolium cation. It is a green solid that is poorly soluble in organic solvents.

Synthesis

The compound is obtained by the reaction of acetonitrile with sulfur monochloride. The initial phases of this reaction entail chlorination of the acetonitrile. The resulting dichloroacetonitrile undergoes cycloaddition with sulfur monochloride:

Cl
2CHCN + S
2Cl
2 → [S
2NC
2Cl
2]Cl + HCl

The cation is highly electrophilic. It hydrolyzes readily. Protic nucleophiles displace one chloride:

[S
2NC
2Cl
2]Cl + 2 RNH
2 → S
2NC
2Cl(=NR) + [RNH
3]Cl

The compound was discovered by Appel et al.