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US 3,941,852 AGranted
Synthesis of 2-methyl-3-buten-2-ol
AssigneeHoffmann-La Roche Inc.
InventorPius Anton Wehrli
Life of this patent
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Abstract
A process for producing 2-methyl-3-buten-2-ol by reacting isoprene with a hydrohalide and then with an aqueous base and then distilling the aqueous mixture in the presence of excess base to maintain the reaction mixture during distillation at a pH of at least 4.
Claims4
A process for separating 2-methyl-3-buten-2-ol from an aqueous medium which is an azeotrope of 2-methyl-3-buten-2-ol and water which comprises:
- adding an alkali metal halide and an inert water-immiscible organic solvent to said aqueous medium to form a two-phase system containing an organic phase and an aqueous phase wherein the salt is added to provide at least 50% of the amount necessary to saturate said aqueous phase, separating said aqueous phase from said organic phase and fractionally distilling said organic phase to recover 2-methyl-3-buten-2-ol while maintaining the organic phase at a pH of at least 4.
Dependencies are inferred from the claim text.