In the reduction of 9-fluorenone to 9-fluorenol. Why is it important to exposing
ID: 546854 • Letter: I
Question
In the reduction of 9-fluorenone to 9-fluorenol.
Why is it important to exposing sodium borohydride to moisture?
Sodium borohydride polymerizes in the presence of water to form an amorphous gooey solid that is difficult to handle.
What is the purpose of adding sulfuric acid after the reduction has been completed?
Why is it important to exposing sodium borohydride to moisture?
Answer choices 1. Sodium borohydride is a mild reductant, but water can amplify its reactivity and make it too strong of a reductant. 2. Sodium borohydride ignites when it comes into contact with water. 3. Sodium borohydride is hygroscopic and when it reacts with water it loses a hydride and no longer can be used as a hydride source. 4.Sodium borohydride polymerizes in the presence of water to form an amorphous gooey solid that is difficult to handle.
Explanation / Answer
Question one should be Why is it important to avoid the exposing of sodium borohydride with water?
Reason is that when sodium borohydride comes in contact with water / moisture produces flammable hydrogen gas SO THE ANSWER IS 2. SODIUM BOROHYDRIDE IGNITES WHEN IT COMES IN CONTACT WITH WATER
2.
Answer is 4. Sulfuric acid promotes dehydration of the intermediate to form the desired product.