4-Isopropoxylphenylboronic acid , its cas register number is 153624-46-5. It also can be called [4-(Propan-2-yloxy)phenyl]boronic acid ; boronic acid, B-[4-(1-methylethoxy)phenyl]- ; [4-(Propan-2-Yl-Oxy)Phenyl]Boranediol Hydrate . 4-Isopropoxylphenylboronic acid (CAS NO.153624-46-5) is a white to off-white or light tan powder.