Process for the preparation of dihalotetrahydrofurans from dihydrofuran
AssigneeEastman Chemical Company
InventorsStephen N. Falling, Patricia Lopez
Life of this patent
Estimating the term…
Abstract
Disclosed is a process for the preparation of 3,4-dichlorotetrahydrofuran, 3,4-dibromotetrahydrofuran, 2,3-dichlorotetrahydrofuran, and 2,3-dibromotetrahydrofuran by the reaction of 2,5- or 2,3-dihydrofuran with chlorine or bromine in the presence of a quaternary onium halide compound. The reaction preferably is carried out by the addition of the dihydrofuran and chlorine or bromine to an organic, halogenation solvent containing chlorine or bromine and the quaternary onium halide compound.
Claims13
Process for the preparation of a dihalotetrahydrofuran which comprises reacting a dihydrofuran with X.sub.2 in the presence of a quaternary onium halide compound;
- wherein the dihalotetrahydrofuran is 3,4-dichlorotetrahydrofuran, 3,4-dibromotetrahydrofuran, 2,3-dichlorotetrahydrofuran, or 2,3-dibromotetrahydrofuran;
- the dihydrofuran is 2,5- or 2,3-dihydrofuran;
- and X.sub.2 is chlorine or bromine.
Process for the preparation of a dihalotetrahydrofuran which comprises adding a dihydrofuran and X.sub.2 to a solution of X.sub.2 and a quaternary onium halide in an organic, halogenation solvent;
- wherein the dihalotetrahydrofuran is 3,4-dichlorotetrahydrofuran, 3,4-dibromotetrahydrofuran, 2,3-dichlorotetrahydrofuran, or 2,3-dibromotetrahydrofuran;
- the dihydrofuran is 2,5- or 2,3-dihydrofuran;
- and X.sub.2 is chlorine or bromine.
Dependencies are inferred from the claim text.