... Review: Reese, CB In "Protective Groups in Organic Chemistry"; McOmie, JFW, Ed.; Plenum Press: New York, 1973 ... 5-py H, J = 7.8 Hz, 1 H), 7.53 (d, 4-py H, J = 7.8 Hz ... The organic extract was washed with water, dried with anhydrous magnesium sulfate, and evaporated to give a ...