Claims
- 1. Process for isomerizing endo-tetrahydrodicyclopentadiene comprising:
- (a) contacting endo-tetrahydrodicyclopentadiene with anhydrous aluminum trichloride wherein the mole ratio of aluminum trichloride to the tetrahydrodiene is in the range between from about 0.001 to about 0.75 and the temperature of the contacting is in the range between from about -20.degree. C to about 90.degree. C;
- (b) continuing said contacting until at least 70% of the endo-tetrahydrodicyclopentadiene is isomerized to exo-tetrahydrodicyclopentadiene; and
- (c) recovering resulting product.
- 2. Process according to claim 1 wherein at least about 90% of the endo-tetrahydrodiene is isomerized to the exo-tetrahydrodiene.
- 3. Process according to claim 1 wherein the contacting takes place in the presence of exo-tetrahydrodicylcopentadiene.
- 4. Process according to claim 1 wherein the contacting takes place in the presence of an inert solvent or exo-tetrahydrodicyclopentadiene.
- 5. Process according to claim 4 wherein the inert solvent is selected from the group consisting of chlorinated paraffins and paraffins.
- 6. Process according to claim 4 wherein the mole ratio of aluminum trichloride to the endo-tetrahydrodiene is in the range between from about 0.01 to about 0.2.
- 7. Process according to claim 6 wherein the inert solvent is selected from the group consisting of hexane, pentane, methylene dichloride, tetrachloroethane, and pentachloroethane.
- 8. Process according to claim 7 wherein the exo-tetrahydrodicyclopentadiene is separated from contacting materials.
- 9. Process according to claim 7 wherein the temperature ranges between from about 10.degree. C to about 70.degree. C and substantially all of the endo-tetrahydrodiene is isomerized to the exo-tetrahydrodiene.
- 10. Process according to claim 1 wherein sludge, from a previous isomerization of the endo-tetrahydrodiene, fortified with a small quantity of fresh aluminum trichloride is used to contact and isomerize a subsequent amount of endo-tetrahydrodiene.
BACKGROUND OF THE INVENTION 20.degree.
The invention herein described was made in the course of or under a contract hereunder with the United States Air Force Systems Command.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3864178 |
Rudy et al. |
Feb 1975 |
|