2-methylpropane-2-thiol
Description
2-Methylpropane-2-thiol (CAS 75-66-1), commercially known as tert-butyl mercaptan, is a synthetic sulfur compound used as a potent flavoring agent and odorant across food and industrial applications.
Its intense, characteristic sulfurous odor makes it effective at trace concentrations, supporting both flavor creation and gas detection functions. In the flavor and fragrance industry, it is used at very low levels.
This compound helps replicate roasted, savory, and sulfurous top notes in processed food formulations. Natural gas and LPG suppliers use it as an odorant additive, blending it into fuel gas streams for safety.
This provides a detectable warning odor for leak detection compliance. Petroleum refiners and petrochemical processors also use it as a reference compound and intermediate in sulfur chemistry research and calibration standards.
In beverage and food flavor houses, it contributes to coffee, meat, and onion flavor profiles where authentic sulfur character is required. It is available in food-grade quality meeting FEMA standards.
The product is supplied as a liquid at ambient conditions, typically in small packaging formats suited to flavor and odorant applications. It also meets various flavor industry purity standards for global use.
Technical grade options are available for gas odorant and industrial use. Packaging ranges from laboratory-scale quantities up to drum volumes for industrial odorant blending operations and large scale manufacturing.
Physical Properties
| Melting Point | -0.5 °C |
| Boiling Point | -63.7-64.2 °C @ Press: 760 Torr |
| Density | 0.80 g/cm³ |
| Flash Point | −12 °F |
| Appearance | liquid with an exceedingly unpleasant smell |
| Color | Clear colorless |
| Odor | sulfury |
| Form | Liquid |
| Water Solubility | Slightly soluble in water |
| Vapor Pressure | 303.5 mm Hg ( 37.7 °C) |
| Refractive Index | n 20/D 1.423(lit.) |
| Log P | 2.206 (est) |
Safety & Handling (Learn More)
Trade & Regulatory
| HS Code | 29309090 |
| UN Number | 2347 |
| ADR Class | 3 |
| Packing Group | II |
| Storage Class | 3 - Flammable liquids |
| WGK (Germany) | 3 |
Documentation
Other Names
tert-butyl mercaptan
Related Products
Need a chemical? Get a quote within 24 hours.