2-Methyl-3-butyn-2-ol
ALDRICH/129763 - 98%
Synonym: Dimethyl ethynyl carbinol
CAS Number: 115-19-5
Empirical Formula (Hill Notation): C5H8O
Molecular Weight: 84.12
EC Number: 204-070-5
MDL Number: MFCD00004467
Linear Formula: HC≡CC(CH3)2OH
Product Type: Chemical


This picture is provided solely for illustration purposes. Optical properties of the actual product may deviate. Relevant product information is printed on labeled products and other accompanying or available information material. This image depicts SKU: 129763-100ML.

This picture is provided solely for illustration purposes. Optical properties of the actual product may deviate. Relevant product information is printed on labeled products and other accompanying or available information material. This image depicts SKU: 129763-1L.
assay | 98% |
autoignition temp. | 662 °F |
bp | 104 °C (lit.) |
density | 0.868 g/mL at 25 °C (lit.) |
expl. lim. | 16.6 % |
form | liquid |
functional group | hydroxyl |
InChI | 1S/C5H8O/c1-4-5(2,3)6/h1, |
InChI key | CEBKHWWANWSNTI-UHFFFAOYSA |
mp | 2.6 °C (lit.) |
Quality Level | 200 ![]() |
refractive index | n |
SMILES string | CC(C)(O)C#C |
vapor pressure | 15 mmHg ( 20 °C) |
Application: | 2-Methyl-3-butyn-2-ol can be used as a reactant to synthesize:,· • Aryl-2-methyl-3-butyn-2 • 2-Methyl-3-buten-2-ol (MBE) by Pd/γ-Al2O3 catalyzed selective hydrogenation reaction. MBE is applicable as an important intermediate in the synthesis of vitamin A. • Diarylacetylenes via Pd-catalyzed Sonogashira coupling reaction with aryl chlorides in the presence of Cs2CO3 as a base. • Optically active propargylic alcohols by enantioselective addition reaction with various aldehydes in the presence of Zn(OTf)2 and N-methylephedrine. |
General description: | 2-Methyl-3-butyn-2-ol (MBY) is used as a precursor in the Mannich reaction and can undergo selective semihydrogenation to produce fine chemicals. |
Packaging: | 1 L in glass bottle |
Packaging: | 5, 100 mL in glass bottle |
Symbol | ![]() ![]() ![]() |
Signal word | Danger |
Hazard statements | H225 - H302 - H318 |
Precautionary statements | P210 - P233 - P240 - P280 - P301 + P312 - P305 + P351 + P338 |
Hazard Codes | Xn |
Risk Statements | 10-22-41 |
Safety Statements | 26-39 |
RIDADR | UN 1987BF 3 / PGII |
WGK Germany | WGK 1 |
Flash Point(F) | 68.0 °F |
Flash Point(C) | 20 °C |
Purity | 98% |
bp | 104 °C (lit.) |
mp | 2.6 °C (lit.) |
Density | 0.868 g/mL at 25 °C (lit.) |
Refractive Index | n |
UNSPSC | 12352100 |