Description General description Learn More at the Professor and Product Portal of Professor Bruce Lipshutz. Packaging 1, 5, 25, 100 g in glass bottle Application Phenol protecting group in the synthesis of laterifluorones. Used to prepare a SEM-ether which was, in turn, removed with BBr3 and cyclized to a benzo-oxapane. Features and Benefits Convenient hydroxyl-protecting reagent. SEM-ethers are stable over a wide pH range, and can be selectively cleaved with fluoride ion under mild aprotic conditions.