Grignard reactions - triphenylmethanol?
In the syntesis of triphenylmethanol, from phenylmagnesiumbromid and methylbenzoat.
1. Why do you use H2SO4 instead of just water to do the last step, where we decompose the triphenyl-CO-MgBr to triphenylmethanol?
Now we had to extract the tri-phe-methanol from the water.
2. Why do we rinse with just a little bit (0.6% solution) of Na2SO3 (Sodiumsulfit).
Then we made a TLC of the final product :
3. How come that the stain on TLC becomes yellow, when its made in H2SO4 ?