Cyclopropylboronic acid pinacol ester (CAS NO.126689-01-8) is also named as 2-Cyclopropyl-4,4,5,5-tetramethyl-1,3,2-dioxaborolane ; (4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)cyclopropane ; 2-Cyclopropylboronic acid, pinacol ester .