2-BROMO-5-METHYL-1,3,4-THIADIAZOLE

China [CN]

Core Physical and Chemical Properties

Appearance and State: Pale yellow to light brown liquid at room temperature (may appear turbid at lower purity levels, slightly lighter in color for high-purity products). Has no noticeable pungent odor or only a faint odor characteristic of heterocyclic compounds.

Boiling Point and Melting Point: Boiling point is approximately 165-168°C (normal pressure). It is volatile and stable when heated (does not decompose). Melting point is below 0°C (usually -5 to -2°C). It may condense into pale yellow crystals at low temperatures but readily re-melts into a liquid upon warming.

Solubility:

Readily soluble in organic solvents such as ethanol, ether, dichloromethane, ethyl acetate, and toluene (miscible with these solvents in all proportions).

Poorly soluble in water (solubility approximately 0.1-0.3 g/L at 25°C). Mixing with water results in separation into an organic phase (product) on top and an aqueous phase on the bottom. Stability:

Stable at room temperature and pressure. Avoid contact with strong oxidants (such as potassium permanganate and potassium chlorate), strong acids (such as concentrated hydrochloric acid and sulfuric acid), and strong bases (such as sodium hydroxide and potassium hydroxide), as substitution reactions or ring structure destruction may occur.

For long-term storage, avoid light (ultraviolet light may accelerate microdecomposition). Stored in a sealed container, it can last for 6-12 months without significant loss of purity.

Density and Refractive Index: At 25°C, the density is approximately 1.68-1.72 g/cm³ (higher than water, so it will sink when mixed with water). The refractive index (n₂₀/D) is approximately 1.565-1.575 (the refractive index can provide a preliminary estimate of product purity).