The oily layer is again warmed with sulfuric acid, as before.
"Organic-Syntheses"
Conant, James Bryant
If this precaution is not employed, the time for the addition of the sulfuric acid is greatly increased, provided the temperature of the reaction mixture is still kept within the limits mentioned.
"Organic-Syntheses"
Conant, James Bryant
The last half of the sulfuric acid must be added gradually, in order to prevent too violent a reaction.
"Organic-Syntheses"
Conant, James Bryant