tert-Butyl mercaptan , 99% , 75-66-1
Synonym(s):
tert-Butyl mercaptan;TBM
CAS NO.：75-66-1
Empirical Formula: C4H10S
Molecular Weight: 90.19
MDL number: MFCD00004857
EINECS: 200-890-2
PRODUCT Properties
| Melting point: | -1.1 °C |
| Boiling point: | 62-65 °C(lit.) |
| Density | 0.8 g/mL at 25 °C(lit.) |
| vapor density | 3.1 (vs air) |
| vapor pressure | 303.5 mm Hg ( 37.7 °C) |
| refractive index | n |
| Flash point: | −12 °F |
| storage temp. | Flammables area |
| solubility | 1.47g/l slightly soluble |
| form | Liquid |
| pka | pK1:11.22 (25°C,μ=0.1) |
| color | Clear colorless |
| Odor | sulfury |
| Odor Threshold | 0.000029ppm |
| Water Solubility | Slightly soluble in water |
| Merck | 14,1579 |
| BRN | 505947 |
| Dielectric constant | 5.4800000000000004 |
| Stability: | Stable. Flammable - note low flashpoint. Incompatible with strong oxidizing agents. |
| LogP | 2.206 (est) |
| CAS DataBase Reference | 75-66-1(CAS DataBase Reference) |
| NIST Chemistry Reference | 2-Propanethiol, 2-methyl-(75-66-1) |
| EPA Substance Registry System | 2-Propanethiol, 2-methyl- (75-66-1) |
Description and Uses
tert-Butylthiol, also known as 2-methyl propane-2-thiol, 2- methyl-2-propane thiol, tert-butyl mercaptan (TBM), and t-BuSH, is an organo sulfur compound with the formula (CH3)3CSH. This thiol may have been used as a flavoring agent, as an odorant for natural gas (which is odorless), and also in a wide range of organic reactions.
Tert-Butylthiol is the main ingredient in many gas odorant blends. It is always utilized as a blend of other compounds, typically dimethyl sulfide, methyl ethyl sulfide, tetrahydrothiophene or other mercaptans (isopropyl mercaptan, sec-butyl mercaptan and/or n-butyl mercaptan, due to its rather high melting point of 273 K. These blends are used only with natural gas and not propane, as the boiling points of these blends and propane are quite different. As propane is delivered as a liquid and vaporizes to gas when being delivered to the appliance, the vapor liquid equilibrium would substantially reduce the amount of odorant blend in the vapor.
Tert - Butyl thiol has been listed on the European Food Safety Authority (FL-no: 12.174) as a flavor additive. There is no indication of what flavor or flavors it may have been used in. It has been removed from this list.
Safety
| Symbol(GHS) |    GHS02,GHS07,GHS09 |
| Signal word | Danger |
| Hazard statements | H225-H317-H411 |
| Precautionary statements | P210-P233-P240-P273-P280-P303+P361+P353 |
| Hazard Codes | F,Xi,Xn,N |
| Risk Statements | 11-41-65-43-36-51/53 |
| Safety Statements | 3-16-26-39-38-36/37-61 |
| RIDADR | UN 2347 3/PG 2 |
| WGK Germany | 3 |
| RTECS | TZ7660000 |
| F | 13 |
| HazardClass | 3.1 |
| PackingGroup | II |
| HS Code | 29309090 |
| Hazardous Substances Data | 75-66-1(Hazardous Substances Data) |
