| abstract |
The invention relates to a novel process for the preparation of unsiolated geminal dihalogeno compounds of the general formula I in which X denotes halogen and R denotes high 1, one of which is a novel process, for example. of unsaturated geminal dihalogen compound d. in which X is halogen u. R high1 a given f. halo-substituted alkyl group o.Alkenylgruppe mean which thereby gekennz. is that you associate. d. allgm. Formula II, wherein R is hydrogen, alkyl, aryl, o. Aralkyl means in one m. Water-miscible organ. Solvent m. a 1 b. 2 molar equivalent amount of metallic zinc, aluminum, tin, iron or magnesium u. with a 0.01 b. 1.5 mol equivalent amount of a mineral acid or an acid salt thereof b.Temp. converts between 0 degrees C and 200 degrees C. The case can be written down to first.sum. Zwischenprod.z.Synthese v.Pyrethroiden verw.wer. |