Isopropenylboronic Acid Pinacol Ester

• CAT Number: R018418
• CAS Number: 126726-62-3
• Molecular Formula: C9H17BO2
• Molecular Weight: 168.04
• Purity: ≥95%
• Synonyms: 4,4,5,5-Tetramethyl-2-(1-methylethenyl)-1,3,2-dioxaborolane; 2-Isopropenyl-4,4,5,5-tetramethyl-1,3,2-dioxaborolane; 4,4,5,5-Tetramethyl-2-(isopropenyl)-1,3,2-dioxaborolane; 4,4,5,5-Tetramethyl-2-(prop-1-en-2-yl)-1,3,2-dioxaborolane
• Storage: -20°C
• IUPAC Name: 4,4,5,5-tetramethyl-2-prop-1-en-2-yl-1,3,2-dioxaborolane
• InChI: InChI=1S/C9H17BO2/c1-7(2)10-11-8(3,4)9(5,6)12-10/h1H2,2-6H3
• InChIKey: SVSUYEJKNSMKKW-UHFFFAOYSA-N
• SMILES: B1(OC(C(O1)(C)C)(C)C)C(=C)C

Isopropenylboronic acid pinacol ester(CAT: R018418) is an organoboron compound with the molecular formula C₉H₁₇BO₂, featuring an isopropenyl group bonded to a boron atom, which is stabilized as a cyclic pinacol ester. It typically appears as a colorless to pale yellow liquid, soluble in many organic solvents. This compound is widely used in organic synthesis, particularly in Suzuki–Miyaura cross-coupling reactions, to introduce isopropenyl functionality into target molecules. The pinacol ester group enhances stability and ease of handling compared to free boronic acids. Its versatility makes it valuable in the preparation of pharmaceuticals, agrochemicals, and fine chemicals where alkenyl-substituted frameworks are desired.