Claims
- 1. In a process for preparing gem-dihalocyclopropane derivatives by reacting an alkene optionally substituted by one or more aromatic groups or halogen atoms with a dihalocarbene in the presence of a catalyst, the improvement which comprises employing as catalyst an onium compound having the general formula ##STR6## in which R.sup.1, R.sup.2 and R.sup.3 each is alkyl or cycloalkyl of up to 40 carbon atoms, Z is an atom of an element of Group VIA of the Periodic Table of the Elements having an atomic number of more than 15 and Y is an anion.
- 2. The improvement according to claim 1, in which the onium compound has more than 3 carbon atoms per molecule.
- 3. The improvement according to claim 2 wherein the reaction is conducted in the presence of a chlorinated hydrocarbon as a solvent.
- 4. The improvement according to claim 3 in which the solvent is dichloromethane.
- 5. The improvement according to claim 1 wherein the onium catalyst is sec-dodecyl-sec-hexadecylethylsulfonium ethyl sulfate.
- 6. The improvement according to claim 1 wherein the onium catalyst is di-n-butylmethylselenonium iodide.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of Ser. No. 359,930, filed May 14, 1973 now abandoned.
US Referenced Citations (3)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
359930 |
May 1973 |
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