Methyl Boronic Acid

image [13061‐96‐6] C 1 H 5 BO 2 (MW 59.86) InChI = 1S/CH5BO2/c1‐2(3)4/h3‐4H,1H3 InChIKey = KTMKRRPZPWUYKK‐UHFFFAOYSA‐N (methylation • organoboron reagents) Alternative Names : methaneboronic acid. Physical Data : m.p. 89–94 °C. 1 p K a 10.4. 2 Solubility : soluble in most organic solvents such as CH 2 Cl 2 , THF, diethyl ether, and so on. Form Supplied in : colorless crystals; commercially available. Analysis of Reagent Purity : 1 H NMR (DMSO‐ d 6 , 400 MHz) : δ 7.42 ( br ., 2 H ), 0.05 (s, 3 H ) ppm. 3 Purification : trituration from pentane. Handling, Storage, and Precautions : methyl boronic acid can be stored under air at −20 °C for an extended period of time.