制备操作 A 0.6 M stock solution of diazomethane in Et2O was prepared by treating a solution of N-nitroso-N-methylurea (1.0 M in Et2O) with an aqueous KOH solution (40%, 5 equiv) at 5 °C for 15 min. The ...

U248 81-81-2 Warfarin, and salts, when present at a concentration of 0.3% or less ...

“Nihilism” comes from the Latin word nihil, or nothing, or “that which does not exist.” Nihilism can be defined as the belief that all values, and therefore institutions, are baseless ...