Potassium thiocyanate
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| Potassium thiocyanate | |
|---|---|
| Image:Potassium thiocyanate.jpg | |
| General | |
| Other names | potassium sulfocyanate potassium isothiocyanate potassium thiocyanide |
| Molecular formula | KSCN |
| Molar mass | 97.18 g/mol |
| Appearance | colorless crystals deliquescent |
| CAS number | [333-20-0] |
| Properties | |
| Density and phase | 1.89 g/cm3, solid |
| Solubility in water | 2170 g/L |
| Solubility in other solvents | e.g. ethanol acetone:210 g/L |
| Melting point | 173 °C |
| Boiling point | 500 °C |
| Hazards | |
| MSDS | External MSDS |
| Main hazards | none |
| NFPA 704 | |
| R/S statement | R: 20/21/22-32-52/53 S: 13-61 |
| RTECS number | XL1925000 |
| Supplementary data page | |
| Structure and properties |
n, εr, etc. |
| Thermodynamic data |
Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Related compounds | |
| Other cations | NaSCN |
| Related compounds | Potassium cyanide Potassium cyanate |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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Potassium thiocyanate is the chemical compound KSCN. It is an important salt of the thiocyanate anion, one of the pseudohalides. The compound has a low melting point relative to most other inorganic salts.
See also: Thiocyanate.
[edit] Use in chemical synthesis
Aqueous KSCN reacts almost quantitatively with Pb(NO3)2 to give Pb(SCN)2. The lead compound has been used to convert acyl chlorides to the thiocyanates.[1]
KSCN converts ethylenecarbonate to ethylenesulfide.[2] For this purpose, the KSCN is first melted under vacuum to remove water. In a related reaction, KSCN converts cyclohexene oxide to the corresponding episulfide.[3]
- C6H10O + KSCN → C6H10S + KOCN
Its the starting product for the synthesis of carbonyl sulfide.
[edit] References
- ^ Smith, P. A. S.; Kan, R. O. "2a-Thiohomophthalimide" Organic Syntheses, 1973, Collected Volume 5, p.1051.
- ^ Searles, S.; Lutz, E. F.; Hays, H. R.; Mortensen, H. E. "Ethylenesulfide" Organic Syntheses, 1973, Collective Volume 5, page 562.
- ^ van Tamelen, E. E. "Cyclohexenesulfide" Organic Syntheses, 1963 Collected Volume 4, p. 232.
[edit] External links
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