Claims
- 1. A process for the preparation of cyclobutene derivatives having the formulas ##STR6## in which formulas I-II R.sup.5 and R.sup.8 each individually represents a primary or secondary alkyl group, R.sup.6 and R.sup.7 a hydrogen atom, a primary or secondary alkyl group, R.sup.9 an alkyl group and R.sup.5 and R.sup.6 each individually represents a hydrogen atom when R.sup.7 represents a primary or secondary alkyl group having at least 2 carbon atoms and R.sup.8 a primary or secondary alkyl group, which process comprises contacting an alkene having the formula
- R.sup.5 R.sup.6 C = CR.sup.7 R.sup.8 III
- with a 1-alkyne having the formula
- HC .tbd. CR.sup.9 IV
- R.sup.5, r.sup.6 r.sup.7, r.sup.8 and R.sup.9 in the formulas III-IV having the same meanings as in the formulas I-II, in the liquid phase in the presence of a dissolved Lewis acid derived from an element of Group III A of the Periodic Table of the Elements, titanium, tin, antimony, tantalum, rhenium, iron or zinc.
- 2. A process claimed in claim 1, in which a tetralkylethene is used as the compound of formula III.
- 3. A process as claimed in claim 2, in which as tetraalkylethene 2,3-dimethyl-2-butene is used.
- 4. A process as claimed in claim 2, in which as tetraalkylethene 2,3,4-trimethyl-2-pentene is used.
- 5. A process as claimed in claim 1, in which IV and the alkene having the general formula III are applied in a molar ratio: alkene between 0.1 and 1.5.
- 6. A process as claimed in claim 1, in which as Lewis acid organometal compound derived from aluminum is used.
- 7. A process as claimed in claim 6, in which as Lewis acid an alkylhaloaluminium compound is used.
- 8. A process as claimed in claim 7, in which as alkylhaloaluminium compound a monoalkylaluminium dihalide is used.
- 9. A process as claimed in claim 8 in which as dihalide a dichloride is used.
- 10. A process as claimed in claim 9, in which as dichloride ethylaluminium dichloride is used.
- 11. A process as claimed in claim 1, which is performed in a solvent which does not react with the Lewis acid or the unsaturated compounds present.
- 12. A process as claimed in claim 1, which is performed at a temperature between 0.degree. and 100.degree. C.
Priority Claims (1)
Number |
Date |
Country |
Kind |
22362/73 |
May 1973 |
UK |
|
Parent Case Info
This is a division of application Ser. No. 468,949, filed May 10, 1974, now U.S. Pat. No. 3,965,204.
US Referenced Citations (3)
Divisions (1)
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Number |
Date |
Country |
Parent |
468949 |
May 1974 |
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