Claims
- 1. A process for obtaining a compound of formula:
- wherein X is chloro or bromo and R is alkyl of up to four carbon atoms, which comprises (a) reacting a compound of formula
- CF.sub.3 --CHXCl (II)
- wherein X is chloro or bromo with 3-methylbut-2-en-al in the presence of a strong base and an inert solvent to produce a compound of formula:
- CF.sub.3 --CXCl--CH(OH)--CH.dbd.C(CH.sub.3).sub.2 (I)
- wherein X is chloro or bromo, and (b) reacting said compound of formula (I) with a tri-lower-alkyl orthoacetate containing up to four carbon atoms in each alkyl group in the presence of an acid catalyst at an elevated temperature for a sufficient time to obtain the compound of formula (IV) but less than the time required at that temperature to convert the compound of formula (IV) to a compound of formula:
- CF.sub.3 --CXCl--CH.dbd.CH.dbd.C(CH.sub.3).sub.2 CO.sub.2 R (III).
- 2.
- 2. The process of claim 1 wherein the acid catalyst in step (b) is replaced by an active clay.
- 3. The process of claim 2 wherein the active clay is montmorillonite.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9311054 |
May 1993 |
GBX |
|
Parent Case Info
This application is a division of application Ser. No. 08/451,288, filed May 26, 1995, now U.S. Pat. No. 5,670,697, which is a division of Ser. No. 08/249,784, filed May 26, 1994, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4183948 |
Huff |
Jan 1980 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
1531750 |
Aug 1975 |
GBX |
Divisions (2)
|
Number |
Date |
Country |
Parent |
451288 |
May 1995 |
|
Parent |
249784 |
May 1994 |
|